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PLANT PHYSIOLOGY , Vol 113, Issue 4 1203-1212, Copyright © 1997 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
Identification of a Receptor-Like Protein Kinase Gene Rapidly Induced by Abscisic Acid, Dehydration, High Salt, and Cold Treatments in Arabidopsis thaliana
S. W. Hong, J. H. Jon, J. M. Kwak and H. G. Nam
Department of Life Science and School of Environmental Engineering, Pohang University of Science and Technology, Pohang, Kyungbuk, 790-784, South Korea (S.W.H., J.H.J., J.M.K., H.G.N.)
A cDNA clone for a receptor-like protein kinase gene (RPK1) was isolated
from Arabidopsis thaliana. The clone is 1952 bp long with 1623 bp of an
open reading frame encoding a peptide of 540 amino acids. The deduced
peptide (RPK1) contains four distinctive domains characteristic of receptor
kinases: (a) a putative amino-terminal signal sequence domain; (b) a domain
with five extracellular leucine-rich repeat sequences; (c) a
membrane-spanning domain; and (d) a cytoplasmic protein kinase domain that
contains all of the 11 subdomains conserved among protein kinases. The RPK1
gene is expressed in flowers, stems, leaves, and roots. Expression of the
RPK1 gene is induced within 1 h after treatment with abscisic acid (ABA).
The gene is also rapidly induced by several environmental stresses such as
dehydration, high salt, and low temperature, suggesting that the gene is
involved in a general stress response. The dehydration-induced expression
is not impaired in aba-1, abi1-1, abi2-1, and abi3-1 mutants, suggesting
that the dehydration-induced expression of the RPK1 gene is
ABA-independent. A possible role of this gene in the signal transduction
pathway of ABA and the environmental stresses is discussed.
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