ABI2, a second protein phosphatase 2C involved in abscisic acid signal transduction in Arabidopsis

Pedro L. Rodriguez, Gregor Benning, Erwin Grill

Research output: Contribution to journalArticlepeer-review

199 Scopus citations

Abstract

The abi2-1 (abscisic acid insensitive) mutant of A. abidopsis thaliana shows abscisic acid (ABA) insensitivity with respect to seed germination and vegetative ABA responses. We identified the ABI2 gene by a combination of positional mapping and homology to ABI1. The ABQ protein shows 80% amino acid sequence identity to ABI1, a protein phosphatase 2C (PP2C) involved in ABA signaling. The mutation that confers the abi2-1 phenotype is equivalent to the mutation previously identified in abi1-1 and the resulting Gly168Asp abi2 protein shows a reduced PP2C activity. Thus, a pair of highly homologous PP2Cs regulate ABA signaling.

Original languageEnglish
Pages (from-to)185-190
Number of pages6
JournalFEBS Letters
Volume421
Issue number3
DOIs
StatePublished - 16 Jan 1998

Keywords

  • ABI1
  • ABI2
  • Abscisic acid
  • Protein phosphatase 2C
  • Signal transduction

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