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THE PLANT CELL, Vol 2, Issue 1 19-27, Copyright © 1990 by American Society of Plant Biologists
Characterization of a Rice Gene Showing Organ-Specific Expression in Response to Salt Stress and Drought
B. Claes, R. Dekeyser, R. Villarroel, M. Van den Bulcke, G. Bauw, M. Van Montagu and A. Caplan
Laboratorium voor Genetica, Rijksuniversiteit Gent, B-9000 Gent, Belgium
Protein changes induced by salinity stress were investigated in the roots
of the salt-sensitive rice cultivar Taichung native 1. We found eight
proteins to be induced and obtained partial sequences of one with a
molecular mass of 15 kilodaltons and an isoelectric point of 5.5. Using an
oligonucleotide probe based on this information, a cDNA clone, salT, was
selected and found to contain an open reading frame coding for a protein of
145 amino acid residues. salT mRNA accumulates very rapidly in sheaths and
roots from mature plants and seedlings upon treatment with Murashige and
Skoog salts (1%), air drying, abscisic acid (20 [mu]M), polyethylene glycol
(5%), sodium chloride (1%), and potassium chloride (1%). Generally, no
induction was seen in the leaf lamina even when the stress should affect
all parts of the plant uniformly. The organ-specific response of salT is
correlatable with the pattern of Na+ accumulation during salt stress.
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