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. 2002 Jul;161(3):1247-55.
doi: 10.1093/genetics/161.3.1247.

A screen for genes that function in abscisic acid signaling in Arabidopsis thaliana

Eiji Nambara  1 , Masaharu Suzuki, Suzanne Abrams, Donald R McCarty, Yuji Kamiya, Peter McCourt
Affiliations

A screen for genes that function in abscisic acid signaling in Arabidopsis thaliana

Eiji Nambara et al. Genetics. 2002 Jul.

Abstract

The plant hormone abscisic acid (ABA) controls many aspects of plant growth and development under a diverse range of environmental conditions. To identify genes functioning in ABA signaling, we have carried out a screen for mutants that takes advantage of the ability of wild-type Arabidopsis seeds to respond to (-)-(R)-ABA, an enantiomer of the natural (+)-(S)-ABA. The premise of the screen was to identify mutations that preferentially alter their germination response in the presence of one stereoisomer vs. the other. Twenty-six mutants were identified and genetic analysis on 23 lines defines two new loci, designated CHOTTO1 and CHOTTO2, and a collection of new mutant alleles of the ABA-insensitive genes, ABI3, ABI4, and ABI5. The abi5 alleles are less sensitive to (+)-ABA than to (-)-ABA. In contrast, the abi3 alleles exhibit a variety of differences in response to the ABA isomers. Genetic and molecular analysis of these alleles suggests that the ABI3 transcription factor may perceive multiple ABA signals.

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