Abstract
Ultrastructural modifications of tomato fruit organelles were correlated with low-temperature injury. Chilling of fruit for 10 days at 2.degree. C interfered with conversion of chloroplasts to chromoplasts. After 15 days, mitochondria and plastids swelled and degenerated, and after 21 days organelles were barely discernible. Fruit stored at 7.degree. C underwent similar changes, but those stored at 13.degree. and 18.degree. C ripened without breakdown. Fruit warmed after low temperature storage of up to 15 days usually recovered, as evidenced by reversible ultrastructural changes in mitochondria and plastids.

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