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Plant and Cell Physiology, 1979, Vol. 20, No. 8 1537-1546
© 1979

Article

Chilling injury in cotton (Gossypium hirsutum L.) Prevention by abscisic acid

Arnon Rikin1, Dan Atsmon1,3 and Carlos Gitler2

1Department of Plant Genetics, The Weizmann Institute of Science Rehovot, Israel
2Department of Membrane Research, The Weizmann Institute of Science Rehovot, Israel

Cotton (Gossypium hirsutum L.) intact seedlings and isolated cotyledonary discs were exposed to chilling (4°C) under humid conditions which prevented dehydration. The damage resulting from chilling was estimated by means of electrolyte leakage and survival in whole seedlings and by the electrolyte leakage and necrotic areas in isolated cotyledonary discs. Also, the effect of chilling on membrane phospholipids and cellular reduced glutathione was determined. Within the first two and three days of chilling, there was a marked reduction in the reduced glutathione and membrane phospholipid levels without electrolyte loss and necrosis. This reduction was completely prevented by pretreatment with abscisic acid. Prolonging the chilling period resulted in decreased survival in whole seedlings and in progressive increase in electrolyte leakage and necrosis in isolated cotyledonary discs. Pretreatment with abscisic acid prior to chilling almost completely prevented this chilling injury when exposure to 4°C was less than 5 days. Even with longer chilling periods, the abscisic acid pretreatment greatly reduced the damage.

3Incumbent of the Seagram Chair in Plant Science.

(Received July 21, 1979; )
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