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Article: Interactions between abscisic acid and ethylene signaling cascades
- Article from:
- Plant Cell
- Article date:
- July 1, 2000
- Author:
CopyrightCopyright American Society of Plant Physiologists Jul 2000. Provided by ProQuest LLC. (Hide copyright information)
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We screened for mutations that either enhanced or suppressed the abscisic acid (ABA)resistant seed germination phenotype of the Arabidopsis abil-1 mutant. Alleles of the constitutive ethylene response mutant ctrl and ethylene-- insensitive mutant ein2 were recovered as enhancer and suppressor mutations, respectively. Using these and other ethylene response mutants, we showed that the ethylene signaling cascade defined by the ETRI, CTR1, and ElN2 genes inhibits ABA signaling in seeds. Furthermore, epistasis analysis between ethylene- and ABA-insensitive mutations indicated that endogenous ethylene promotes seed germination by decreasing sensitivity to endogenous ABA. In marked contrast to ...