Mobile Gibberellin Directly Stimulates Arabidopsis Hypocotyl Xylem Expansion
| Autor: | Christian S. Hardtke, Claus Schwechheimer, David Pacheco-Villalobos, Kaisa Nieminen, Richard Sibout, Laura Ragni |
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| Přispěvatelé: | Institut Jean-Pierre Bourgin (IJPB), Institut National de la Recherche Agronomique (INRA)-AgroParisTech, Department of Plant Molecular Biology, Université de Lausanne (UNIL), Center of Life and Food Sciences Weihenstephan, Plant Systems Biology, Technical University of Munich (TUM), Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
0106 biological sciences
Secondary growth Plant Science wood-forming tissues 01 natural sciences Arabidopsis Génétique des plantes Arabidopsis thaliana Research Articles Vascular tissue 0303 health sciences vascular tissue biology polar auxin transport food and beverages signals Hypocotyl Cell biology Gibberellin homeobox genes pennywise Plant Shoots Signal Transduction flowering-time growth Receptors Cell Surface Flowers Protein Serine-Threonine Kinases Plants genetics [SDV.GEN.GPL]Life Sciences [q-bio]/Genetics/Plants genetics 03 medical and health sciences Quantitative Trait Heritable hybrid aspen Xylem Botany biomass production biomasse 030304 developmental biology pound-foolish Indoleacetic Acids floraison Arabidopsis Proteins fungi Genetic Variation Biological Transport Cell Biology 15. Life on land biology.organism_classification Gibberellins hybride arabidopsis Polar auxin transport Flower formation 010606 plant biology & botany |
| Zdroj: | Plant Cell Plant Cell, American Society of Plant Biologists, 2011, 23 (4), pp.1322-1336. ⟨10.1105/tpc.111.084020⟩ The Plant cell Plant Cell 4 (23), 1322-1336. (2011) The Plant cell, American Society of Plant Biologists (ASPB), 2011, 23 (4), pp.1322-1336. ⟨10.1105/tpc.111.084020⟩ |
| ISSN: | 1040-4651 1532-298X |
| Popis: | Secondary growth of the vasculature results in the thickening of plant structures and continuously produces xylem tissue, the major biological carbon sink. Little is known about the developmental control of this quantitative trait, which displays two distinct phases in Arabidopsis thaliana hypocotyls. The later phase of accelerated xylem expansion resembles the secondary growth of trees and is triggered upon flowering by an unknown, shoot-derived signal. We found that flowering-dependent hypocotyl xylem expansion is a general feature of herbaceous plants with a rosette growth habit. Flowering induction is sufficient to trigger xylem expansion in Arabidopsis. By contrast, neither flower formation nor elongation of the main inflorescence is required. Xylem expansion also does not depend on any particular flowering time pathway or absolute age. Through analyses of natural genetic variation, we found that ERECTA acts locally to restrict xylem expansion downstream of the gibberellin (GA) pathway. Investigations of mutant and transgenic plants indicate that GA and its signaling pathway are both necessary and sufficient to directly trigger enhanced xylogenesis. Impaired GA signaling did not affect xylem expansion systemically, suggesting that it acts downstream of the mobile cue. By contrast, the GA effect was graft transmissible, suggesting that GA itself is the mobile shoot-derived signal. |
| Databáze: | OpenAIRE |
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