Response of Cotton Mitochondria to Chilling Temperatures1

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Abstract
Chilling cotton (Gossypium hirsutum L.) seedlings at 5 C for 2 and 4 days reduced the specific activity of succinate oxidation by the isolated root mitochondria. Chillhardening at 15 C for 2 days prior to the chilling treatment only partially protected against the decrease. When mitochondria were isolated from unchilled plants and activity measured from 5 to 30 C, a break in the activity curve was noted at 15 C. Mitochondrial enzyme inactivations may help explain the nature of chilling injury in cotton.

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