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Changes in Sugars, Starch, RNA, Protein, and Lipid-soluble Phosphate in Leaves of Cotton Plants at Low Temperatures¹

Cotton plants (Gossypium hirsutum L., cv ‘Westburn’) were severely injured when chilled at 5 C without prior hardening. Exposure to hardening temperatures of 15 C day and 10 C night prevented subsequent injury at 5 C. Sugars and starch increased during exposure to hardening temperatures, but RNA, protein, and lipid-soluble phosphate decreased. Except for increases hi sugars, these changes in cotton during exposure to hardening temperatures are opposite changes which have been reported in plants that can be hardened to withstand subzero temperatures.

Key Words: Carbohydrates • Chilling injury • Cold hardening • Leaves • Phospholipids

² Present address: Western Cotton Research Laboratory, 4135 E. Broadway Road, Phoenix, Arizona 85040

Received for publication September 21, 1970.