Regulation of the Abscisic Acid-responsive Gene Rab28 in Maize Viviparous Mutants

Overview

Journal Mol Gen Genet

Specialties Genetics
Molecular Biology

Date 1991 Dec 1

PMID 1837331

Citations 33

Authors

M Pla

J Gomez

A Goday

M Pages

Affiliations

Soon will be listed here.

Abstract

We have isolated a new maize gene, rab28, that responds to abscisic acid (ABA) treatment. This gene has been characterized by determining the sequence of the cDNA and corresponding genomic copy, and by mapping the start site of its transcript. The rab 28 gene encodes a protein of predicted molecular weight 27713 Da which shows strong homology with the Lea D-34 protein identified in cotton. The proximal promoter region contains the conserved ABA-response element, CACGTGG, reported in other plant genes to be responsible for ABA induction. rab 28 mRNA has been identified as ABA-inducible in embryos and young leaves. It is also induced by water-stress in leaves of wild-type plants. Regulation of the rab 28 gene was studied in maize viviparous mutants. The results obtained with the ABA-insensitive vp1 mutant show that rab 28 transcripts do not accumulate to a significant level during embryogenesis. Surprisingly, induction of rab 28 mRNA can be achieved in young embryos by exogenous ABA treatment. Moreover, water-stressed or ABA-treated seedlings of vp1 contain significant levels of rab 28 mRNA which is not detectable in well-watered seedlings. Regulation of the rab 28 gene in excised young embryos of ABA-deficient vp2 mutants, in which influences of the maternal environment are absent, closely resembles that found in non-mutant excised young embryos. The significance of these results is discussed.

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