Auxin flow-mediated anatomical modifications in Indian Meso–Cenozoic plants
02 Apr 2020-Vol. 167, Iss: 2, pp 212-218
TL;DR: The present investigation records the evidence of such disrupted polar auxin flow in the form of auxin whirlpool in fossil woods of Tracheidoxyl, Ailanthoxylon indicum and Calophylloxylon sp.
Abstract: Polar transport of the phytohormone auxin is a well-known physiological phenomenon recorded in different extant plant groups including bryophytes and pteridophytes. Earlier, this phenomenon has bee...
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2,511 citations
TL;DR: This poster presents a selection of photographs from around the world taken in the period of May 21 to 29, 1997, as well as some of the more recent photographs taken in China and the United States.
Abstract: Pieter Baas – Leiden, The Netherlands Nadezhda Blokhina – Vladivostok, Russia Tomoyuki Fujii – Ibaraki, Japan Peter Gasson – Kew, UK Dietger Grosser – Munich, Germany Immo Heinz – Munich, Germany Jugo Ilic – South Clayton, Australia Jiang Xiaomei – Beijing, China Regis Miller – Madison, WI, USA Lee Ann Newsom – University Park, PA, USA Shuichi Noshiro – Ibaraki, Japan Hans Georg Richter – Hamburg, Germany Mitsuo Suzuki – Sendai, Japan Teresa Terrazas – Montecillo, Mexico Elisabeth Wheeler – Raleigh, NC, USA Alex Wiedenhoeft – Madison, WI, USA
1,308 citations
TL;DR: The results considered in the chapter suggest that plant hormones, and especially auxin, play an essential role both in the relation among plant organs and in the relations among neighboring cells.
Abstract: Publisher Summary This chapter discusses the interactions and internal programmes that result in the patterned differentiation of vascular tissues. The term “pattern” is used to refer to the high degree of order, or predictability, of the system at all levels— the orientation and contacts of the strands forming a coherent system supplying all the organs of the plant, the organization of the transporting cells in files that are functional vessels and sieve tubes, and the relations among the different vascular tissues (phloem, cambium and xylem) and their component cells. The stress is, thus, on relations between cells of the same and of different types and not on the processes of differentiation and controlled gene expression. It is shown that all aspects of the development and maintenance of the vascular tissues might depend on one control system, which is at least partially hormonal. The way this control could operate is in the working hypothesis that together with the problems and possibilities it poses is the central conclusion of this work. A major characteristic of the hypothesis considered is that a gradual, feedback relation between differentiation and signal distribution creates a reliable pattern. Controls of this type may not result in very precise patterns, but they would be simple and dependable in avoiding mistakes of functional significance. They could, thus, account for the vascular patterns found in plants, where no two halves of the same leaf are exactly the same. These controls also have the virtue of depending on known signals and cellular responses. It is, thus, possible that the principles on which these controls are based have a wide relevance, both in plants and in other cases of biological development. The results considered in the chapter suggest that plant hormones, and especially auxin, play an essential role both in the relation among plant organs and in the relations among neighboring cells.
636 citations
"Auxin flow-mediated anatomical modi..." refers background in this paper
...Vascular tissue differentiation in living pteridophytes and seed plants is regulated by different phytohormones like auxin, gibberellin, cytokinin, and ethylene (Sachs 1969, 1981; Savidge and Wareing 1981; Uggla et al. 1996; Cooke et al. 2002)....
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TL;DR: This work demonstrates the existence of a steep radial concentration gradient of the endogenous auxin, indole-3-acetic acid, over the lateral meristem responsible for the bulk of plant secondary growth, the vascular cambium in Pinus sylvestris trees, giving evidence for a regulatory system in plants based on positional signaling, similar to animal systems.
Abstract: By using a novel, extremely sensitive and specific gas chromatography-mass spectrometry technique we demonstrate in Pinus sylvestris (L.) trees the existence of a steep radial concentration gradient of the endogenous auxin, indole-3-acetic acid, over the lateral meristem responsible for the bulk of plant secondary growth, the vascular cambium. This is the first evidence that plant morphogens, such as indole-3-acetic acid, occur in concentration gradients over developing tissues. This finding gives evidence for a regulatory system in plants based on positional signaling, similar to animal systems.
474 citations
"Auxin flow-mediated anatomical modi..." refers background in this paper
...Vascular tissue differentiation in living pteridophytes and seed plants is regulated by different phytohormones like auxin, gibberellin, cytokinin, and ethylene (Sachs 1969, 1981; Savidge and Wareing 1981; Uggla et al. 1996; Cooke et al. 2002)....
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248 citations
"Auxin flow-mediated anatomical modi..." refers background in this paper
...Vascular tissue differentiation in living pteridophytes and seed plants is regulated by different phytohormones like auxin, gibberellin, cytokinin, and ethylene (Sachs 1969, 1981; Savidge and Wareing 1981; Uggla et al. 1996; Cooke et al. 2002)....
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