Abstract
Exogenously applied abscisic acid (ABA) induced frost hardening of Arabidopsis thaliana (L.) Heynh. The freezing tolerance of A. thaliana plantlets treated with ABA (15 mg/l) at a non-acclimating temperature (20 °C) appeared to increase even more rapidly than following a low temperature (4 °C) acclimation. Analysis of in vivo-labelled soluble proteins by two-dimensional gel electrophoresis revealed several low temperature - or ABA - induced proteins, which where not produced in non-acclimated plants. A subset of these proteins was induced by both low temperature and ABA treatments, suggesting that they might be directly involved in the frost hardening process in A. thaliana.
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