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Xylem
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Schematic cross section of part of a leaf, xylem shown as red circles at figure 8
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to shoots and leaves, but it also transports nutrients.[1][2] The word "xylem" is derived from the Greek word ξύλον (xylon), meaning "wood"; the best-known xylem tissue is wood, though it is found throughout the plant.[3] The term was introduced by Carl Nägeli in 1858.[4][5]
Contents
1 Structure
2 Primary and secondary xylem
3 Main function – upwards water transport
3.1 Cohesion-tension theory
3.2 Measurement of pressure
4 Evolution
5 Development
5.1 Protoxylem and metaxylem
5.2 Patterns of protoxylem and metaxylem
6 See also
7 References
7.1 General references
Structure[edit]
Cross section of some xylem cells
The most distinctive xylem cells are the long tracheary elements that transport water. Tracheids and vessel elements are distinguished by their shape; vessel elements are shorter, and are connected together into long tubes that are called vessels.[6]
Xylem also contains two other cell types: parenchyma and fibers.[7]
Xylem can be found:
in vascular bundles, present in non-woody plants and non-woody parts of woody plants
in secondary xylem, laid down by a meristem called the vascular cambium in woody plants
as part of a stelar arrangement not divided into bundles, as in many ferns.
In transitional stages of plants with secondary growth, the first two categories are not mutually exclusive, although usually a vascular bundle will contain primary xylem only.
The branching pattern exhibited by xylem follows Murray's law.[8]
Primary and secondary xylem[edit]
Primary xylem is formed during primary growth from procambium. It includes protoxylem and metaxylem. Metaxylem develops after the protoxylem but before secondary xylem. Metaxylem has wider vessels and tracheids than protoxylem.
Secondary xylem is formed during secondary growth from vascular cambium. Although secondary xylem is also found in members of the gymnosperm groups Gnetophyta and Ginkgophyta and to a lesser extent in members of the Cycadophyta, the two main groups in which secondary xylem can be found are:
conifers (Coniferae): there are some six hundred species of conifers. All species have secondary xylem, which is relatively uniform in structure throughout this group. Many conifers become tall trees: the secondary xylem of such trees is used and marketed as softwood.
angiosperms (Angiospermae): there are some quarter of a million to four hundred thousand species of angiosperms. Within this group secondary xylem is rare in the monocots.[9] Many non-monocot angiosperms become trees, and the secondary xylem of these is used and marketed as hardwood.
Main function – upwards water transport[edit]
The xylem, vessels and tracheids of the roots, stems and leaves are interconnected to form a continuous system of water conducting channels reaching all parts of the plants. It transports water and soluble mineral nutrients from the roots throughout the plant. It is also used to replace water lost during transpiration and photosynthesis. Xylem sap consists mainly of water and inorganic ions, although it can contain a number of organic chemicals as well. The transport is passive, not powered by energy spent by the tracheary elements themselves, which are dead by maturity and no longer have living contents. Transporting sap upwards becomes more difficult as the height of a plant increases and upwards transport of water by xylem is considered to limit the maximum height of trees.[10] Three phenomena cause xylem sap to flow:
Pressure flow hypothesis: Sugars produced in the leaves and other green tissues are kept in the phloem system, creating a solute pressure differential versus the xylem system carrying a far lower load of solutes- water and minerals. The phloem pressure can rise to several MPa,[11] far higher than atmospheric pressure. Selective inter-connection between these systems allows this high solute concentration in the phloem to draw xylem fluid upwards by negative pressure.
Transpirational pull: Similarly, the evaporation of water from the surfaces of mesophyll cells to the atmosphere also creates a negative pressure at the top of a plant. This causes millions of minute menisci to form in the mesophyll cell wall. The resulting surface tension causes a negative pressure or tension in the xylem that pulls the water from the roots and soil.
Root pressure: If the water potential of the root cells is more negative than that of the soil, usually due to high concentrations of solute, water can move by osmosis into the root from the soil. This causes a positive pressure that forces sap up the xylem towards the leaves. In some circumstances, the sap will be forced from the leaf through a hydathode in a phenomenon known as guttation. Root pressure is highest in the morning before the stomata open and allow transpiration to begin. Different plant species can have different root pressures even in a similar environment; examples include up to 145 kPa in Vitis riparia but around zero in Celastrus orbiculatus.[12]
The primary force that creates the capillary action movement of water upwards in plants is the adhesion between the water and the surface of the xylem conduits.[13][14] Capillary action provides the force that establishes an equilibrium configuration, balancing gravity. When transpiration removes water at the top, the flow is needed to return to the equilibrium.
Transpirational pull results from the evaporation of water from the surfaces of cells in the leaves. This evaporation causes the surface of the water to recess into the pores of the cell wall. By capillary action, the water forms concave menisci inside the pores. The high surface tension of water pulls the concavity outwards, generating enough force to lift water as high as a hundred meters from ground level to a tree's highest branches.
Transpirational pull requires that the vessels transporting the water be very small in diameter; otherwise, cavitation would break the water column. And as water evaporates from leaves, more is drawn up through the plant to replace it. When the water pressure within the xylem reaches extreme levels due to low water input from the roots (if, for example, the soil is dry), then the gases come out of solution and form a bubble – an embolism forms, which will spread quickly to other adjacent cells, unless bordered pits are present (these have a plug-like structure called a torus, that seals off the opening between adjacent cells and stops the embolism from spreading).
Cohesion-tension theory[edit]
The cohesion-tension theory is a theory of intermolecular attraction that explains the process of water flow upwards (against the force of gravity) through the xylem of plants. It was proposed in 1894 by John Joly and Henry Horatio Dixon.[15][16] Despite numerous objections,[17][18] this is the most widely accepted theory for the transport of water through a plant's vascular system based on the classical research of Dixon-Joly (1894), Eugen Askenasy (1845–1903) (1895),[19][20] and Dixon (1914,1924).[21][22]
Water is a polar molecule. When two water molecules approach one another, the slightly negatively charged oxygen atom of one forms a hydrogen bond with a slightly positively charged hydrogen atom in the other. This attractive force, along with other intermolecular forces, is one of the principal factors responsible for the occurrence of surface tension in liquid water. It also allows plants to draw water from the root through the xylem to the leaf.
Water is constantly lost through transpiration from the leaf. When one water molecule is lost another is pulled along by the processes of cohesion and tension. Transpiration pull, utilizing capillary action and the inherent surface tension of water, is the primary mechanism of water movement in plants. However, it is not the only mechanism involved. Any use of water in leaves forces water to move into them.
Transpiration in leaves creates tension (differential pressure) in the cell walls of mesophyll cells. Because of this tension, water is being pulled up from the roots into the leaves, helped by cohesion (the pull between individual water molecules, due to hydrogen bonds) and adhesion (the stickiness between water molecules and the hydrophilic cell walls of plants). This mechanism of water flow works because of water potential (water flows from high to low potential), and the rules of simple diffusion.[23]
Over the past century, there has been a great deal of research regarding the mechanism of xylem sap transport; today, most plant scientists continue to agree that the cohesion-tension theory best explains this process, but multiforce theories that hypothesize several alternative mechanisms have been suggested, including longitudinal cellular and xylem osmotic pressure gradients, axial potential gradients in the vessels, and gel- and gas-bubble-supported interfacial gradients.[24][25]
Measurement of pressure[edit]
A diagram showing the setup of a pressure bomb
Until recently, the differential pressure (suction) of transpirational pull could only be measured indirectly, by applying external pressure with a pressure bomb to counteract it.[26] When the technology to perform direct measurements with a pressure probe was developed, there was initially some doubt about whether the classic theory was correct, because some workers were unable to demonstrate negative pressures. More recent measurements do tend to validate the classic theory, for the most part. Xylem transport is driven by a combination[27] of transpirational pull from above and root pressure from below, which makes the interpretation of measurements more complicated.
Evolution[edit]
Xylem appeared early in the history of terrestrial plant life. Fossil plants with anatomically preserved xylem are known from the Silurian (more than 400 million years ago), and trace fossils resembling individual xylem cells may be found in earlier Ordovician rocks. The earliest true and recognizable xylem consists of tracheids with a helical-annular reinforcing layer added to the cell wall. This is the only type of xylem found in the earliest vascular plants, and this type of cell continues to be found in the protoxylem (first-formed xylem) of all living groups of plants. Several groups of plants later developed pitted tracheid cells, it seems, through convergent evolution. In living plants, pitted tracheids do not appear in development until the maturation of the metaxylem (following the protoxylem).
In most plants, pitted tracheids function as the primary transport cells. The other type of tracheary element, besides the tracheid, is the vessel element. Vessel elements are joined by perforations into vessels. In vessels, water travels by bulk flow, as in a pipe, rather than by diffusion through cell membranes. The presence of vessels in xylem has been considered to be one of the key innovations that led to the success of the angiosperms.[28] However, the occurrence of vessel elements is not restricted to angiosperms, and they are absent in some archaic or "basal" lineages of the angiosperms: (e.g., Amborellaceae, Tetracentraceae, Trochodendraceae, and Winteraceae), and their secondary xylem is described by Arthur Cronquist as "primitively vesselless". Cronquist considered the vessels of Gnetum to be convergent with those of angiosperms.[29] Whether the absence of vessels in basal angiosperms is a primitive condition is contested, the alternative hypothesis states that vessel elements originated in a precursor to the angiosperms and were subsequently lost.
Photos showing xylem elements in the shoot of a fig tree (Ficus alba): crushed in hydrochloric acid, between slides and cover slips
To photosynthesize, plants must absorb CO2 from the atmosphere. However, this comes at a price: while stomata are open to allow CO2 to enter, water can evaporate.[30] Water is lost much faster than CO2 is absorbed, so plants need to replace it, and have developed systems to transport water from the moist soil to the site of photosynthesis.[30] Early plants sucked water between the walls of their cells, then evolved the ability to control water loss (and CO2 acquisition) through the use of stomata. Specialized water transport tissues soon evolved in the form of hydroids, tracheids, then secondary xylem, followed by an endodermis and ultimately vessels.[30]
The high CO2 levels of Silurian-Devonian times, when plants were first colonizing land, meant that the need for water was relatively low. As CO2 was withdrawn from the atmosphere by plants, more water was lost in its capture, and more elegant transport mechanisms evolved.[30] As water transport mechanisms, and waterproof cuticles, evolved, plants could survive without being continually covered by a film of water. This transition from poikilohydry to homoiohydry opened up new potential for colonization.[30] Plants then needed a robust internal structure that held long narrow channels for transporting water from the soil to all the different parts of the above-soil plant, especially to the parts where photosynthesis occurred.
During the Silurian, CO2 was readily available, so little water needed expending to acquire it. By the end of the Carboniferous, when CO2 levels had lowered to something approaching today's, around 17 times more water was lost per unit of CO2 uptake.[30] However, even in these "easy" early days, water was at a premium, and had to be transported to parts of the plant from the wet soil to avoid desiccation. This early water transport took advantage of the cohesion-tension mechanism inherent in water. Water has a tendency to diffuse to areas that are drier, and this process is accelerated when water can be wicked along a fabric with small spaces. In small passages, such as that between the plant cell walls (or in tracheids), a column of water behaves like rubber – when molecules evaporate from one end, they pull the molecules behind them along the channels. Therefore, transpiration alone provided the driving force for water transport in early plants.[30] However, without dedicated transport vessels, the cohesion-tension mechanism cannot transport water more than about 2 cm, severely limiting the size of the earliest plants.[30] This process demands a steady supply of water from one end, to maintain the chains; to avoid exhausting it, plants developed a waterproof cuticle. Early cuticle may not have had pores but did not cover the entire plant surface, so that gas exchange could continue.[30] However, dehydration at times was inevitable; early plants cope with this by having a lot of water stored between their cell walls, and when it comes to it sticking out the tough times by putting life "on hold" until more water is supplied.[30]
A banded tube from the late Silurian/early Devonian. The bands are difficult to see on this specimen, as an opaque carbonaceous coating conceals much of the tube. Bands are just visible in places on the left half of the image – click on the image for a larger view. Scale bar: 20 μm
To be free from the constraints of small size and constant moisture that the parenchymatic transport system inflicted, plants needed a more efficient water transport system. During the early Silurian, they developed specialized cells, which were lignified (or bore similar chemical compounds)[30] to avoid implosion; this process coincided with cell death, allowing their innards to be emptied and water to be passed through them.[30] These wider, dead, empty cells were a million times more conductive than the inter-cell method, giving the potential for transport over longer distances, and higher CO2 diffusion rates.
The earliest macrofossils to bear water-transport tubes are Silurian plants placed in the genus Cooksonia.[31] The early Devonian pretracheophytes Aglaophyton and Horneophyton have structures very similar to the hydroids of modern mosses. Plants continued to innovate new ways of reducing the resistance to flow within their cells, thereby increasing the efficiency of their water transport. Bands on the walls of tubes, in fact apparent from the early Silurian onwards,[32] are an early improvisation to aid the easy flow of water.[33] Banded tubes, as well as tubes with pitted ornamentation on their walls, were lignified[34] and, when they form single celled conduits, are considered to be tracheids. These, the "next generation" of transport cell design, have a more rigid structure than hydroids, allowing them to cope with higher levels of water pressure.[30] Tracheids may have a single evolutionary origin, possibly within the hornworts,[35] uniting all tracheophytes (but they may have evolved more than once).[30]
Water transport requires regulation, and dynamic control is provided by stomata.[36] By adjusting the amount of gas exchange, they can restrict the amount of water lost through transpiration. This is an important role where water supply is not constant, and indeed stomata appear to have evolved before tracheids, being present in the non-vascular hornworts.[30]
An endodermis probably evolved during the Silu-Devonian, but the first fossil evidence for such a structure is Carboniferous.[30] This structure in the roots covers the water transport tissue and regulates ion exchange (and prevents unwanted pathogens etc. from entering the water transport system). The endodermis can also provide an upwards pressure, forcing water out of the roots when transpiration is not enough of a driver.
Once plants had evolved this level of controlled water transport, they were truly homoiohydric, able to extract water from their environment through root-like organs rather than relying on a film of surface moisture, enabling them to grow to much greater size.[30] As a result of their independence from their surroundings, they lost their ability to survive desiccation – a costly trait to retain.[30]
During the Devonian, maximum xylem diameter increased with time, with the minimum diameter remaining pretty constant.[33] By the middle Devonian, the tracheid diameter of some plant lineages (Zosterophyllophytes) had plateaued.[33] Wider tracheids allow water to be transported faster, but the overall transport rate depends also on the overall cross-sectional area of the xylem bundle itself.[33] The increase in vascular bundle thickness further seems to correlate with the width of plant axes, and plant height; it is also closely related to the appearance of leaves[33] and increased stomatal density, both of which would increase the demand for water.[30]
While wider tracheids with robust walls make it possible to achieve higher water transport pressures, this increases the problem of cavitation.[30] Cavitation occurs when a bubble of air forms within a vessel, breaking the bonds between chains of water molecules and preventing them from pulling more water up with their cohesive tension. A tracheid, once cavitated, cannot have its embolism removed and return to service (except in a few advanced angiosperms[37][38] which have developed a mechanism of doing so). Therefore, it is well worth plants' while to avoid cavitation occurring. For this reason, pits in tracheid walls have very small diameters, to prevent air entering and allowing bubbles to nucleate. Freeze-thaw cycles are a major cause of cavitation. Damage to a tracheid's wall almost inevitably leads to air leaking in and cavitation, hence the importance of many tracheids working in parallel.[30]
Cavitation is hard to avoid, but once it has occurred plants have a range of mechanisms to contain the damage.[30] Small pits link adjacent conduits to allow fluid to flow between them, but not air – although ironically these pits, which prevent the spread of embolisms, are also a major cause of them.[30] These pitted surfaces further reduce the flow of water through the xylem by as much as 30%.[30] Conifers, by the Jurassic, developed an ingenious improvement, using valve-like structures to isolate cavitated elements. These torus-margo structures have a blob floating in the middle of a donut; when one side depressurizes the blob is sucked into the torus and blocks further flow.[30] Other plants simply accept cavitation; for instance, oaks grow a ring of wide vessels at the start of each spring, none of which survive the winter frosts. Maples use root pressure each spring to force sap upwards from the roots, squeezing out any air bubbles.
Growing to height also employed another trait of tracheids – the support offered by their lignified walls. Defunct tracheids were retained to form a strong, woody stem, produced in most instances by a secondary xylem. However, in early plants, tracheids were too mechanically vulnerable, and retained a central position, with a layer of tough sclerenchyma on the outer rim of the stems.[30] Even when tracheids do take a structural role, they are supported by sclerenchymatic tissue.
Tracheids end with walls, which impose a great deal of resistance on flow;[33] vessel members have perforated end walls, and are arranged in series to operate as if they were one continuous vessel.[33] The function of end walls, which were the default state in the Devonian, was probably to avoid embolisms. An embolism is where an air bubble is created in a tracheid. This may happen as a result of freezing, or by gases dissolving out of solution. Once an embolism is formed, it usually cannot be removed (but see later); the affected cell cannot pull water up, and is rendered useless.
End walls excluded, the tracheids of prevascular plants were able to operate under the same hydraulic conductivity as those of the first vascular plant, Cooksonia.[33]
The size of tracheids is limited as they comprise a single cell; this limits their length, which in turn limits their maximum useful diameter to 80 μm.[30] Conductivity grows with the fourth power of diameter, so increased diameter has huge rewards; vessel elements, consisting of a number of cells, joined at their ends, overcame this limit and allowed larger tubes to form, reaching diameters of up to 500 μm, and lengths of up to 10 m.[30]
Vessels first evolved during the dry, low CO2 periods of the late Permian, in the horsetails, ferns and Selaginellales independently, and later appeared in the mid Cretaceous in angiosperms and gnetophytes.[30] Vessels allow the same cross-sectional area of wood to transport around a hundred times more water than tracheids![30] This allowed plants to fill more of their stems with structural fibers, and also opened a new niche to vines, which could transport water without being as thick as the tree they grew on.[30] Despite these advantages, tracheid-based wood is a lot lighter, thus cheaper to make, as vessels need to be much more reinforced to avoid cavitation.[30]
Development[edit]
Patterns of xylem development: xylem in brown; arrows show direction of development from protoxylem to metaxylem.
Xylem development can be described by four terms: centrarch, exarch, endarch and mesarch. As it develops in young plants, its nature changes from protoxylem to metaxylem (i.e. from first xylem to after xylem). The patterns in which protoxylem and metaxylem are arranged is important in the study of plant morphology.
Protoxylem and metaxylem[edit]
As a young vascular plant grows, one or more strands of primary xylem form in its stems and roots. The first xylem to develop is called 'protoxylem'. In appearance protoxylem is usually distinguished by narrower vessels formed of smaller cells. Some of these cells have walls which contain thickenings in the form of rings or helices. Functionally, protoxylem can extend: the cells are able to grow in size and develop while a stem or root is elongating. Later, 'metaxylem' develops in the strands of xylem. Metaxylem vessels and cells are usually larger; the cells have thickenings which are typically either in the form of ladderlike transverse bars (scalariform) or continuous sheets except for holes or pits (pitted). Functionally, metaxylem completes its development after elongation ceases when the cells no longer need to grow in size.[39][40]
Patterns of protoxylem and metaxylem[edit]
There are four main patterns to the arrangement of protoxylem and metaxylem in stems and roots.
Centrarch refers to the case in which the primary xylem forms a single cylinder in the center of the stem and develops from the center outwards. The protoxylem is thus found in the central core and the metaxylem in a cylinder around it.[41] This pattern was common in early land plants, such as "rhyniophytes", but is not present in any living plants.[citation needed]
The other three terms are used where there is more than one strand of primary xylem.
Exarch is used when there is more than one strand of primary xylem in a stem or root, and the xylem develops from the outside inwards towards the center, i.e. centripetally. The metaxylem is thus closest to the center of the stem or root and the protoxylem closest to the periphery. The roots of vascular plants are normally considered to have exarch development.[39]
Endarch is used when there is more than one strand of primary xylem in a stem or root, and the xylem develops from the inside outwards towards the periphery, i.e. centrifugally. The protoxylem is thus closest to the center of the stem or root and the metaxylem closest to the periphery. The stems of seed plants typically have endarch development.[39]
Mesarch is used when there is more than one strand of primary xylem in a stem or root, and the xylem develops from the middle of a strand in both directions. The metaxylem is thus on both the peripheral and central sides of the strand with the protoxylem between the metaxylem (possibly surrounded by it). The leaves and stems of many ferns have mesarch development.[39]
See also[edit]
Wikimedia Commons has media related to Xylem.
Phloem
Soil plant atmosphere continuum
Stele
Suction
Tylosis
Vascular bundle
Vascular tissue
Xylem sap
References[edit]
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^ Jump up to: a b c d e f g h Niklas, K. J. (1985). "The Evolution of Tracheid Diameter in Early Vascular Plants and Its Implications on the Hydraulic Conductance of the Primary Xylem Strand". Evolution. 39 (5): 1110–1122. doi:10.2307/2408738. JSTOR 2408738. PMID 28561493.
Jump up ^ Niklas, K.; Pratt, L. (1980). "Evidence for lignin-like constituents in Early Silurian (Llandoverian) plant fossils". Science. 209 (4454): 396–397. Bibcode:1980Sci...209..396N. doi:10.1126/science.209.4454.396. PMID 17747811.
Jump up ^ Qiu, Y.L.; Li, L.; Wang, B.; Chen, Z.; Knoop, V.; Groth-malonek, M.; Dombrovska, O.; Lee, J.; Kent, L.; Rest, J.; et al. (2006). "The deepest divergences in land plants inferred from phylogenomic evidence". Proceedings of the National Academy of Sciences. 103 (42): 15511–6. Bibcode:2006PNAS..10315511Q. doi:10.1073/pnas.0603335103. PMC 1622854  . PMID 17030812.
Jump up ^ Stewart, W.N.; Rothwell, G.W. (1993). Paleobiology and the evolution of plants. Cambridge University Press.
Jump up ^ Koratkar, Sanjay. "Cavitation and Embolism in Vascular Plants (With Diagram)". Biology Discussion.
Jump up ^ Daniel M. Johnson, Katherine A. McCulloh, David R. Woodruff, Frederick C. Meinzerc (June 2012). "Hydraulic safety margins and embolism reversal in stems and leaves: Why are conifers and angiosperms so different?" (PDF). U.S Forest Service. CS1 maint: Multiple names: authors list (link)
^ Jump up to: a b c d Foster, A.S.; Gifford, E.M. (1974). Comparative Morphology of Vascular Plants (2nd ed.). San Francisco: W.H. Freeman. pp. 55–56. ISBN 978-0-7167-0712-7.
Jump up ^ Taylor, T.N.; Taylor, E.L.; Krings, M. (2009). Paleobotany, the Biology and Evolution of Fossil Plants (2nd ed.). Amsterdam; Boston: Academic Press. pp. 207ff., 212ff. ISBN 978-0-12-373972-8.
Jump up ^ White, A. Toby; Kazlev, M. Alan. "Glossary". palaeos.com. Archived from the original on December 20, 2010.
General references[edit]
C. Wei; E. Steudle; M. T. Tyree; P. M. Lintilhac (May 2001). "The essentials of direct xylem pressure measurement". Plant, Cell and Environment. 24 (5): 549–555. doi:10.1046/j.1365-3040.2001.00697.x. is the main source used for the paragraph on recent research.
N. Michele Holbrook; Michael J. Burns; Christopher B. Field (November 1995). "Negative Xylem Pressures in Plants: A Test of the Balancing Pressure Technique". Science. 270 (5239): 1193–4. Bibcode:1995Sci...270.1193H. doi:10.1126/science.270.5239.1193. is the first published independent test showing the Scholander bomb actually does measure the tension in the xylem.
Pockman, W.T.; J.S. Sperry; J.W. O'Leary (December 1995). "Sustained and significant negative water pressure in xylem". Nature. 378 (6558): 715–6. Bibcode:1995Natur.378..715P. doi:10.1038/378715a0. is the second published independent test showing the Scholander bomb actually does measure the tension in the xylem.
Campbell, Neil A.; Jane B. Reece (2002). Biology (6th ed.). Benjamin Cummings. ISBN 978-0-8053-6624-2.
Kenrick, Paul; Crane, Peter R. (1997). The Origin and Early Diversification of Land Plants: A Cladistic Study. Washington, D. C.: Smithsonian Institution Press. ISBN 1-56098-730-8.
Muhammad, A.F.; R. Sattler (1982). "Vessel Structure of Gnetum and the Origin of Angiosperms". American Journal of Botany. Botanical Society of America. 69 (6): 1004–21. doi:10.2307/2442898. JSTOR 2442898.
Melvin T. Tyree; Martin H. Zimmermann (2003). Xylem Structure and the Ascent of Sap (2nd ed.). Springer. ISBN 3-540-43354-6. recent update of the classic book on xylem transport by the late Martin Zimmermann
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text:
Bill Raisch
From Wikipedia, the free encyclopedia
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This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (November 2013) (Learn how and when to remove this template message)
Bill Raisch as the One-Armed Man in The Fugitive
Carl William Raisch (April 5, 1905 – July 31, 1984), was an American dancer and actor, known as the One-Armed Man pursued by Richard Kimble (David Janssen) on the 1963–1967 TV series The Fugitive.[1]
Contents
[hide]
1 Early life
2 Career
3 References
4 External links
Early life[edit]
Bill Raisch was from North Bergen, New Jersey.[1]
Career[edit]
A dancer who worked for Ziegfeld Follies in the 1930s,[citation needed] he lost his right arm while serving in World War II.[1] He played bit parts in several movies including a 1953 appearance in the ending of The War Of The Worlds where he is in a crowd scene after the first martian machine crashes. His first memorable film role was in a famous fight scene with Kirk Douglas in Lonely are the Brave (1962). Raisch's best remembered role, however, was in the 1963–1967 TV series The Fugitive, in which he played "The One-Armed Man" (who frequently went by the alias Fred Johnson) who was the real killer of the wife of Dr. Richard Kimble, played by David Janssen.[1]
Raisch worked for many years as an acting teacher, and also had a long professional relationship with Burt Lancaster, working as Lancaster's stand-in in several movies.
After The Fugitive ended, Raisch was scarcely seen on TV or the media again as he focused on his career as an acting teacher. He died of lung cancer in 1984 in Santa Monica, California, at age 79.[citation needed]
References[edit]
^ Jump up to: a b c d Whitty, Stephen (May 18, 2013). "Family Viewing: 'Lonely Are the Brave'". NJ.com.
External links[edit]
Biography portal
Bill Raisch on IMDb
Authority control
WorldCat Identities
BNE: XX4907172
ISNI: 0000 0001 1938 7207
VIAF: 107572541
Retrieved from "https://en.wikipedia.org/w/index.php?title=Bill_Raisch&oldid=845194230"
Categories:
1905 births
1984 deaths
American amputees
American people of German descent
American male television actors
Deaths from cancer in California
Deaths from lung cancer
People from North Bergen, New Jersey
United States Navy sailors
Burials at Woodlawn Memorial Cemetery, Santa Monica
20th-century American male actors
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Unsolved (U.S. TV series)
From Wikipedia, the free encyclopedia
Jump to: navigation, search
Unsolved
Genre
Drama
Based on
Murder Rap: The Untold Story of Biggie Smalls & Tupac Shakur Murder Investigations by Greg Kading
Composer(s)
Joseph Trapanese
Country of origin
United States
Original language(s)
English
No. of seasons
1
No. of episodes
10 (list of episodes)
Production
Executive producer(s)
Anthony Hemingway
Mark Taylor
Greg Kading
Kyle Long
Camera setup
Single-camera
Production company(s)
HemingwayTaylor
Universal Cable Productions
Distributor
NBCUniversal Television Distribution
Release
Original network
USA Network
Original release
February 27, 2018 (2018-02-27) – present (present)
Unsolved is an American true crime anthology television series. The first season is based on the murders of rappers Tupac and Biggie Smalls in the late-1990s. It premiered February 27, 2018 on USA Network.
The 10-episode first season titled The Murders of Tupac and the Notorious B.I.G. chronicles the dual police investigations of Detective Greg Kading (Josh Duhamel) and Detective Russell Poole (Jimmi Simpson) into the controversial murders of two of the rap industry's most legendary players, Tupac Shakur (Marcc Rose) and The Notorious B.I.G. (Wavyy Jonez).[1][2]
Contents
[hide]
1 Cast
2 Episodes
3 Development
4 Reception
4.1 Critical response
4.2 Ratings
5 References
6 External links
Cast[edit]
Wavyy Jonez as Christopher Wallace[3]
Marcc Rose as Tupac Shakur[3]
Josh Duhamel as Detective Greg Kading[4]
Jimmi Simpson as Detective Russell Poole[4]
Bokeem Woodbine as Officer Daryn Dupree[4]
Jamie McShane as Detective Fred Miller[5]
Brent Sexton as Detective Brian Tyndall[5]
Luke James as Sean “Puffy” Combs[6]
Aisha Hinds as Voletta Wallace [6]
LeToya Luckett as Sharitha Golden [6]
Donald Faison as Jacques Agnant
Funkmaster Flex as himself
Episodes[edit]
No.
Title [7]
Directed by
Written by
Original air date
U.S. viewers
(millions)
1
"Wherever It Leads" Anthony Hemingway Kyle Long February 27, 2018 (2018-02-27) 1.60[8]
2
"Nobody Talks" Anthony Hemingway Kyle Long March 6, 2018 (2018-03-06) 1.13[9]
3
"The Mack" Ernest Dickerson Denitria Harris-Lawrence March 13, 2018 (2018-03-13) 1.01[10]
4
"Take Your Best Shot" Anthony Hemingway Chris Downey March 20, 2018 (2018-03-20) 1.04[11]
5
"The Art of War" Kate Woods Jameal Turner March 27, 2018 (2018-03-27) 0.95[12]
6
"East Coast, West Coast" Erica Watson Tash Gray April 3, 2018 (2018-04-03) 0.84[13]
7
"Half the Job" Darren Grant Samir Mehta April 10, 2018 (2018-04-10) 0.81[14]
8
"Tupac Amaru Shakur" Anthony Hemingway Denitria Harris-Lawrence & Jameal Turner April 17, 2018 (2018-04-17) 0.76[15]
9
"Christopher" Kate Woods Chris Downey April 24, 2018 (2018-04-24) 0.77[16]
10
"Unsolved?" Anthony Hemingway Kyle Long May 1, 2018 (2018-05-01) 0.71[17]
Development[edit]
The series was ordered on May 12, 2017. Emmy winner Anthony Hemingway directed the pilot and will executive produce the series, along with Mark Taylor through their Hemingway-Taylor production company. Kyle Long wrote the pilot and will also executive produce. Greg Kading, who will also serve as co-executive producer, led multiple law-enforcement task forces investigating the murders and authored the book Murder Rap: The Untold Story of Biggie Smalls & Tupac Shakur Murder Investigations.[2][18]
Reception[edit]
Critical response[edit]
On the review aggregation website Rotten Tomatoes, the series holds an approval rating of 75% with an average rating of 5.93/10 based on 24 reviews.[19] Metacritic, which uses a weighted average, assigned the series a score of 67 out of 100 based on 16 reviews, indicating "generally favorable reviews."[20]
Ratings[edit]
No.
Title
Air date
Rating
(18–49)
Viewers
(millions)
DVR
(18–49)
DVR viewers
(millions)
Total
(18–49)
Total viewers
(millions)
1 "Wherever It Leads" February 27, 2018 0.7 1.60[8] 0.4 0.74 1.1 2.35[21]
2 "Nobody Talks" March 6, 2018 0.4 1.13[9] 0.3 N/A 0.7[22] N/A
3 "The Mack" March 13, 2018 0.4 1.01[10] 0.3 N/A 0.7[23] N/A
4 "Take Your Best Shot" March 20, 2018 0.4 1.04[11] 0.3 N/A 0.7[24] N/A
5 "The Art of War" March 27, 2018 0.4 0.95[12] N/A N/A N/A N/A
6 "East Coast, West Coast" April 3, 2018 0.3 0.84[13] 0.3 N/A 0.6[25] N/A
7 "Half the Job" April 10, 2018 0.3 0.81[14] 0.3 N/A 0.6[26] N/A
8 "Tupac Amaru Shakur" April 17, 2018 0.3 0.76[15] N/A N/A N/A N/A
9 "Christopher" April 24, 2018 0.3 0.77[16] 0.3 N/A 0.6[27] N/A
10 "Unsolved?" May 1, 2018 0.3 0.71[17] N/A N/A N/A N/A
References[edit]
Jump up ^ "Breaking News - USA Locks February 27 10/9c Premiere Date for "Unsolved: The Murders of Tupac and The Notorious B.I.G." | TheFutonCritic.com". thefutoncritic.com. Retrieved 2018-02-06.
^ Jump up to: a b "Cast & Info | Unsolved". USA Network. Retrieved 2018-02-06.
^ Jump up to: a b Calvario, Liz (6 March 2017). "'Unsolved': Marcc Rose And Wavyy Jonez Cast As Tupac And Biggie In USA's Murder Mystery Pilot".
^ Jump up to: a b c Andreeva, Nellie (23 February 2017). "'Unsolved': Josh Duhamel, Jimmi Simpson & Bokeem Woodbine To Topline USA Pilot On Tupac Shakur & Biggie Smalls Murders".
^ Jump up to: a b Wagmeister, Elizabeth (12 May 2017). "Tupac-Biggie Smalls Series 'Unsolved' Greenlit at USA Network".
^ Jump up to: a b c Petski, Denise (22 March 2017). "'Unsolved': Luke James, Aisha Hinds & Letoya Luckett Cast In USA's Tupac Shakur Biggie Smalls Pilot".
Jump up ^ "Shows A-Z - unsolved, on usa". The Futon Critic. Retrieved February 28, 2018.
^ Jump up to: a b Metcalf, Mitch (February 28, 2018). "Updated: ShowBuzzDaily's Top 150 Tuesday Cable Originals & Network Finals: 2.27.2018". Showbuzz Daily. Retrieved February 28, 2018.
^ Jump up to: a b Metcalf, Mitch (March 7, 2018). "Updated: ShowBuzzDaily's Top 150 Tuesday Cable Originals & Network Finals: 3.6.2018". Showbuzz Daily. Retrieved March 7, 2018.
^ Jump up to: a b Metcalf, Mitch (March 14, 2018). "Updated: ShowBuzzDaily's Top 150 Tuesday Cable Originals & Network Finals: 3.13.2018". Showbuzz Daily. Retrieved March 14, 2018.
^ Jump up to: a b Metcalf, Mitch (March 21, 2018). "Updated: ShowBuzzDaily's Top 150 Tuesday Cable Originals & Network Finals: 3.20.2018". Showbuzz Daily. Retrieved March 21, 2018.
^ Jump up to: a b Metcalf, Mitch (March 28, 2018). "Updated: ShowBuzzDaily's Top 150 Tuesday Cable Originals & Network Finals: 3.27.2018". Showbuzz Daily. Retrieved March 28, 2018.
^ Jump up to: a b Metcalf, Mitch (April 4, 2018). "Updated: ShowBuzzDaily's Top 150 Tuesday Cable Originals & Network Finals: 4.3.2018". Showbuzz Daily. Retrieved April 4, 2018.
^ Jump up to: a b Metcalf, Mitch (April 11, 2018). "Updated: ShowBuzzDaily's Top 150 Tuesday Cable Originals & Network Finals: 4.10.2018". Showbuzz Daily. Retrieved April 11, 2018.
^ Jump up to: a b Metcalf, Mitch (April 18, 2018). "Updated: ShowBuzzDaily's Top 150 Tuesday Cable Originals & Network Finals: 4.17.2018". Showbuzz Daily. Retrieved April 18, 2018.
^ Jump up to: a b Metcalf, Mitch (April 25, 2018). "Updated: ShowBuzzDaily's Top 150 Tuesday Cable Originals & Network Finals: 4.24.2018". Showbuzz Daily. Retrieved April 25, 2018.
^ Jump up to: a b Metcalf, Mitch (May 2, 2018). "Updated: ShowBuzzDaily's Top 150 Tuesday Cable Originals & Network Finals: 5.1.2018". Showbuzz Daily. Retrieved May 2, 2018.
Jump up ^ Andreeva, Nellie (2017-05-12). "'Unsolved' Drama About Tupac & Biggie's Murders Gets USA Network Series Order". Deadline. Retrieved 2018-02-06.
Jump up ^ "Unsolved: The Murders of Tupac and The Notorious B.I.G. (2018)". Rotten Tomatoes. Retrieved April 23, 2018.
Jump up ^ "Unsolved: The Murders of Tupac and The Notorious B.I.G. reviews". Metacritic. Retrieved April 23, 2018.
Jump up ^ Porter, Rick (March 15, 2018). "'Walking Dead' stays atop the cable Live +7 ratings for Feb. 26-March 4". TV by the Numbers. Retrieved March 15, 2018.
Jump up ^ Porter, Rick (March 22, 2018). "'Atlanta' and 'The Alienist' make more solid gains in cable Live +7 ratings for March 5–11". TV by the Numbers. Retrieved March 22, 2018.
Jump up ^ Porter, Rick (March 29, 2018). "'The Fosters' finale doubles in cable Live +7 ratings for March 12-18". TV by the Numbers. Retrieved March 29, 2018.
Jump up ^ Porter, Rick (April 6, 2018). "'Krypton' premiere makes solid gains in cable Live +7 ratings for March 19-25". TV by the Numbers. Retrieved April 6, 2018.
Jump up ^ Porter, Rick (April 19, 2018). "'Fixer Upper' finale goes out strong: Cable Live +7 ratings for April 2-8". TV by the Numbers. Retrieved April 19, 2018.
Jump up ^ Porter, Rick (April 26, 2018). "'The Last O.G.' scores for TBS in cable Live +7 ratings for April 9-15". TV by the Numbers. Retrieved April 26, 2018.
Jump up ^ Porter, Rick (May 10, 2018). "'Suits' finale gets solid bump in cable Live +7 ratings for April 23-29". TV by the Numbers. Retrieved May 10, 2018.
External links[edit]
Official website at USA Network
Unsolved on IMDb
Greg Kading
Anthony Hemingway
Russell Poole
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