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Plant J. 1998 Sep;15(6):765-71.

Expression of the Arabidopsis abi1-1 mutant allele inhibits proteinase inhibitor wound-induction in tomato.

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1
Departamento de Genética Molecular, Centro de Investigación y Desarrollo-C.S.I.C., Barcelona, Spain.

Abstract

Abscisic acid (ABA) is an essential component in the wound signalling cascade. Increased levels of endogenous ABA were observed after wounding and shown to be a requisite for wound-induced expression of the proteinase inhibitor II genes. We have taken advantage of the dominant character of the Arabidopsis abi1-1 mutation, to investigate whether ABl1 has a function in ABA signalling in response to wounding. Transgenic tomato plants carrying copies of either the wild-type ABI1 or the mutant abi1-1 alleles were obtained and assayed for wound-induction of the pin2 or LAP genes. While normal levels of gene induction were observed in the transgenic ABI1 plants, the abi1-1 transformants displayed a severe wilty phenotype and reduced seed dormancy. Expression of the abi1-1 dominant mutation blocked accumulation of the drought-induced TAS14 and LE25 mRNAs in response to ABA, as well as ABA- and wound-induced expression of the defense-associated pin2 and LAP transcripts. MeJA-induction of the pin2 and LAP mRNAs, on the contrary, was not affected in the abi1-1 transformants. These results indicate that abi1-1 inhibits wound-induced expression of the pin2 and LAP transcripts by blocking ABA-induction of these genes. This implicates ABI1 in wound-signalling and suggests that a common early ABA signalling pathway may function in the responses to wounding and water stress.

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