Mitogen-activated Protein Kinase Signaling in Postgermination Arrest of Development by Abscisic Acid

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2002 Nov 16

PMID 12434021

Citations 75

Authors

C Lu

M-H Han

N V Fedoroff

Affiliations

Soon will be listed here.

Abstract

Abscisic acid (ABA) mediates plant responses to environmental stress, particularly to water status. During germination, the embryo emerges from dormancy as the ABA concentration declines. Exposure to exogenous ABA during germination arrests development rapidly, but reversibly, enabling seedlings to withstand early water stress without loss of viability. Postgermination proteolytic degradation of the essential ABI5 transcription factor is interrupted by perception of an increase in ABA concentration, leading to ABI5 accumulation and reactivation of embryonic genes. Making use of the ABA-hypersensitive hyl1 mutant of Arabidopsis, we show that the ABA signal is transmitted to the transcriptional apparatus through mitogen-activated protein kinase signaling.

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