Abstract

The expression pattern of the five dhn/lea/rab-related genes (cor47, dhnX, lti30, lti45 and rab18) identified so far in A. thaliana, was characterized in plants exposed to low temperature, drought and abscisic acid (ABA). Expression of both lti30 and lti45 was mainly responsive to low temperature similar to cor47. The lti45 and lti30 genes show only a weak response to ABA in contrast to cor47, which is moderately induced by this hormone. The three genes were also induced in severely water-stressed plants although the expression of lti30 and lti45 was rather low. In contrast to these mainly low temperature-induced genes, the expression of rab18 was strongly induced both in water-stressed and ABA-treated plants but was only slightly responsive to cold. The dhnX gene showed a very different expression pattern. It was not induced with any of the treatments tested but exhibited a significant constitutive expression. The low-temperature induction of the genes in the first group, lti30 and lti45, is ABA-independent, deduced from experiments with the ABA-deficient (aba-l) and ABA-insensitive (abi1) mutants of A. thaliana, whereas the induction of rab18 is ABA-mediated. The expression of dhnX was not significantly affected in the ABA mutants.

Keywords

ABSCISIC ACID; ARABIDOPSIS THALIANA; COLD ACCLIMATION; LEA; RAB; WATER STRESS

Published in

Plant Molecular Biology
1994, Volume: 26, number: 1, pages: 131-144
Publisher: KLUWER ACADEMIC PUBL

SLU Authors

• Welin, Björn

  • Department of Molecular Genetics, Swedish University of Agricultural Sciences
    

• Olson, Åke

  • Department of Molecular Genetics, Swedish University of Agricultural Sciences
    

• Palva, Tapio

  • Department of Molecular Genetics, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Agricultural Science


Publication identifier

DOI: https://doi.org/10.1007/BF00039526

Permanent link to this page (URI)

https://res.slu.se/id/publ/43786