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Effects of Chilling on Protein Synthesis and CO₂ Fixation in Cotton Leaves¹

Biochemical changes resulting from chilling of cotton seedlings (Gossypium hirsutum L. cultivar Paymaster) that had been subjected to 5, 10, and 25 C for 36 hours were studied. Incorporation of ¹⁴C amino acids into protein and fixation of ¹⁴CO₂ immediately after chilling showed a great increase in protein synthesis and CO₂ fixation. When protein synthesis was determined as a function of chilling duration at either 5 or 10 C, there was an increase in the amino acid incorporation following chilling up to 48 hours, but at 72 hours there was a sharp decrease. This result indicates that severe chilling injury caused sufficient damage to the metabolism of the plant to prevent the recovery processes from occurring. The observed stimulation in protein synthesis and CO₂ fixation after chilling may be related to processes associated with recovery of tissue from the chilling damage.

² Post-doctoral student, (present address, Biology Department, Queen's University, Kingston, Ontario); Professor and Associate Professor respectively, of Plant Physiology, Department of Plant Sciences, Texas A & M University, College Station, Texas 77843.

Received for publication January 8, 1971.