Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 99, Issue 24, Pages 15812-15817Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.242607499
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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 AB15 transcription factor is interrupted by perception of an increase in ABA concentration, leading to AB15 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 mitogenactivated protein kinase signaling.
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