Abscisic Acid Represses Growth of the Arabidopsis Embryonic Axis after Germination by Enhancing Auxin Signaling

被引:119
作者
Belin, Christophe [1 ]
Megies, Christian [1 ]
Hauserova, Eva [2 ,3 ]
Lopez-Molina, Luis [1 ]
机构
[1] Univ Geneva, Dept Biol Vegetale, CH-1211 Geneva 4, Switzerland
[2] Palacky Univ, Lab Growth Regulators, Fac Sci, CZ-78371 Olomouc, Czech Republic
[3] Swedish Univ Agr Sci, Dept Forest Genet & Plant Physiol, Umea Plant Sci Ctr, S-90183 Umea, Sweden
基金
瑞士国家科学基金会;
关键词
SEED-GERMINATION; HYPOCOTYL ELONGATION; ROOT GRAVITROPISM; MESSENGER-RNA; PLANT-GROWTH; TRANSPORT; THALIANA; GENE; ABA; ETHYLENE;
D O I
10.1105/tpc.109.067702
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
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.
引用
收藏
页码:2253 / 2268
页数:16
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