Abscisic acid represses growth of the Arabidopsis embryonic axis after germination by enhancing auxin signaling

Autor: Luis Lopez-Molina, Christophe Belin, Eva Hauserová, Christian Megies
Jazyk: angličtina
Rok vydání: 2009
Předmět:
Plants
Genetically Modified/drug effects/embryology/genetics/metabolism
Arabidopsis
Seedling/drug effects/embryology/genetics/metabolism
Plant Science
Gene Expression Regulation
Plant/drug effects/genetics/physiology
Hypocotyl
chemistry.chemical_compound
Plant Growth Regulators
Gene Expression Regulation
Plant
Tandem Mass Spectrometry
Radicle
Arabidopsis thaliana
heterocyclic compounds
Axis elongation
Abscisic acid
Research Articles
Chromatography
High Pressure Liquid
chemistry.chemical_classification
biology
Seeds/drug effects/embryology/genetics/metabolism
food and beverages
Abscisic Acid/pharmacology
Plants
Genetically Modified
Cell biology
ddc:580
Seeds
Signal Transduction
Auxin influx
Spectrometry
Mass
Electrospray Ionization
Plant Growth Regulators/metabolism
Blotting
Western
Arabidopsis/drug effects/embryology/genetics/metabolism
Germination
Auxin
Botany
Signal Transduction/drug effects/genetics/physiology
Arabidopsis Proteins/genetics/metabolism/physiology
Indoleacetic Acids
Arabidopsis Proteins
organic chemicals
Indoleacetic Acids/metabolism
fungi
Cell Biology
biology.organism_classification
Blotting
Northern
chemistry
Microscopy
Fluorescence
Seedlings
Germination/drug effects/genetics/physiology
Abscisic Acid
Zdroj: Plant Cell, Vol. 21, No 8 (2009) pp. 2253-2268
ISSN: 1040-4651
Popis: 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. This involves repression of the AUXIN INDUCIBLE (Aux/IAA) gene AXR2/IAA7, encoding a key component of ABA- and auxin-dependent responses during postgerminative growth.
Databáze: OpenAIRE
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