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PLANT CELL 12 (7): 1117-1126

Copyright © 2000 by the American Society of Plant Physiologists.

Plant Cell, Vol. 12, 1117-1126, July 2000, Copyright © 2000, American Society of Plant Physiologists Regulation of Abscisic Acid Signaling by the Ethylene Response Pathway in Arabidopsis Majid Ghassemiana, Eiji Nambaraa, Sean Cutlera, Hiroshi Kawaideb, Yuji Kamiyab, and Peter McCourta a Department of Botany, 25 Willcocks Street, University of Toronto, Toronto M5S 3B2, Ontario, Canada b Laboratory for Plant Hormone Function, Frontier Research Program, Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama 351-0198, Japan Peter McCourt, mccourt{at}botany.utoronto.ca (E-mail), 416-978-5878 (fax)

Although abscisic acid (ABA) is involved in a variety of plant growth and developmental processes, few genes that actually regulate the transduction of the ABA signal into a cellular response have been identified. In an attempt to determine negative regulators of ABA signaling, we identified mutants, designated enhanced response to ABA3 (era3), that increased the sensitivity of the seed to ABA. Biochemical and molecular analyses demonstrated that era3 mutants overaccumulate ABA, suggesting that era3 is a negative regulator of ABA synthesis. Subsequent genetic analysis of era3 alleles, however, showed that these are new alleles at the ETHYLENE INSENSITIVE2 locus. Other mutants defective in their response to ethylene also showed altered ABA sensitivity; from these results, we conclude that ethylene appears to be a negative regulator of ABA action during germination. In contrast, the ethylene response pathway positively regulates some aspects of ABA action that involve root growth in the absence of ethylene. We discuss the response of plants to ethylene and ABA in the context of how these two hormones could influence the same growth responses.

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