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Plant and Cell Physiology, 1995, Vol. 36, No. 7 1245-1251
© 1995

Induction of Cold Hardiness by Salt Stress Involves Synthesis of Cold- and Abscisic Acid-Responsive Proteins in Potato (Solanum commersonii Dun)1

Stephen B. Ryu2, Antonello Costa3, Zhanguo Xin4 and Paul H. Li5

Laboratory of Plant Hardiness, Department of Horticultural Science and Plant Biological Sciences Program, University of Minnesota St. Paul, Minnesota 55108, U.S.A.

5To whom correspondence should be addressed.

Salt stress has been found to increase frost tolerance in some herbaceous species. In an attempt to understand the molecular basis of the frost tolerance induced by salt stress, the effect of salt (100 mM NaCl) on total proteins in stem-cultured potato plantlets (Solarium commersonn Dun) was analyzed on two-dimensional gels. Nine salt-induced proteins were identified after 24 h salt treatment, at which time cold hardiness increased by three degrees. Direct comparisons of the proteins with those induced by cold- and abscisic acid(ABA)-treatments revealed that five of the salt-induced proteins were also induced by cold(4°/2°C)-treatment and seven were also induced by ABA(40µM)-treatment. Three proteins (Mrr/pls 13/7.0, 27/6.6 and 48/6.9) were inducible in both cold- and ABA-treatments in association with frost hardening. After 6 h salt treatment, endogenous ABA levels in plantlet leaves showed a transient six-fold increase before cold hardiness developed. The results suggest that salt-induction of cold hardiness involves the synthesis of cold and ABA-responsive proteins and the alteration of protein synthesis is mediated by ABA elevated upon salt stress. This study also suggests that a subset of proteins induced by cold and ABA-treatments are related to salt stress.

1Scientific Journal Series Paper No. 20787 of the Minnesota Agricultural Experimental Station, St. Paul, MN 55108, U.S.A.

2Present address: Department of Biochemistry Willard Hall, Kansas State University, Manhattan, KS 66506, U.S.A.

3Present address: Via G.B. Marino 13, 80125-Napoli, Italy

4Present address: Institute of Biological Chemistry, Washington State Univ., Pullman, WA 99164, U.S.A.

(Received May 2, 1995; Accepted July 26, 1995)
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