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Local auxin metabolism regulates environment-induced hypocotyl elongation
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SYSNO ASEP 0461530 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Local auxin metabolism regulates environment-induced hypocotyl elongation Author(s) Zheng, Z.Y. (US)
Guo, Y. (CN)
Novák, Ondřej (UEB-Q) RID, ORCID, SAI
Chen, W. (US)
Ljung, K. (SE)
Noel, J.P. (US)
Chory, J. (US)Source Title Nature Plants - ISSN 2055-026X
Roč. 2, č. 4 (2016), s. 16025Number of pages 9 s. Language eng - English Country GB - United Kingdom Keywords GENOME-WIDE ANALYSIS ; PLANT DEVELOPMENT ; SHADE AVOIDANCE Subject RIV EB - Genetics ; Molecular Biology R&D Projects LO1204 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UEB-Q - RVO:61389030 UT WOS 000375397600003 DOI 10.1038/NPLANTS.2016.25 Annotation A hallmark of plants is their adaptability of size and form in response to widely fluctuating environments. The metabolism and redistribution of the phytohormone auxin play pivotal roles in establishing active auxin gradients and resulting cellular differentiation. In Arabidopsis thaliana, cotyledons and leaves synthesize indole-3-acetic acid (IAA) from tryptophan through indole-3-pyruvic acid (3-IPA) in response to vegetational shade. This newly synthesized auxin moves to the hypocotyl where it induces elongation of hypocotyl cells. Here we show that loss of function of VAS2 (IAA-amido synthetase Gretchen Hagen 3 (GH3). 17) leads to increases in free IAA at the expense of IAA-Glu (IAA-glutamate) in the hypocotyl epidermis. This active IAA elicits shade- and high temperature-induced hypocotyl elongation largely independently of 3-IPA-mediated IAA biosynthesis in cotyledons. Our results reveal an unexpected capacity of local auxin metabolism to modulate the homeostasis and spatial distribution of free auxin in specialized organs such as hypocotyls in response to shade and high temperature. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2017
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