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Abscisic Acid Represses Growth of the Arabidopsis Embryonic Axis after Germination by Enhancing Auxin Signaling
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SYSNO ASEP 0337484 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Abscisic Acid Represses Growth of the Arabidopsis Embryonic Axis after Germination by Enhancing Auxin Signaling Author(s) Belin, Ch. (CH)
Megies, Ch. (CH)
Hauserová, Eva (UEB-Q)
Lopez-Molina, L. (CH)Source Title Plant Cell. - : Oxford University Press - ISSN 1040-4651
Roč. 21, č. 8 (2009), s. 2253-2268Number of pages 17 s. Language eng - English Country US - United States Keywords SEED-GERMINATION ; HYPOCOTYL ELONGATION ; ROOT GRAVITROPISM Subject RIV ED - Physiology CEZ AV0Z50380511 - UEB-Q (2005-2011) UT WOS 000270416700008 DOI 10.1105/tpc.109.067702 Annotation Under unfavorable environmental conditions, the stress phytohormone ABA inhibits the developmental transition from an embryo in a dry seed into a young seedling. We developed a genetic screen to isolate Arabidopsis thaliana mutants whose early seedling development is resistant to ABA. Here, we report the identification of a recessive mutation in AUXIN RESISTANT1 (AUX1), encoding a cellular auxin influx carrier. Although auxin is a major morphogenesis hormone in plants, little is known about ABA-auxin interactions during early seedling growth. We show that aux1 and pin2 mutants are insensitive to ABA-dependent repression of embryonic axis (hypocotyl and radicle) elongation. Genetic and physiological experiments show that this involves auxin transport to the embryonic axis elongation zone, where ABA enhances the activity of an auxin-responsive promoter. We propose that ABA represses embryonic axis elongation by potentiating auxin signaling in its elongation zone. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2010
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