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High-temperature Stress and Mitochondrial Activity of Harvested Mature-green Tomatoes

1989; American Society for Horticultural Science; Volume: 114; Issue: 5 Linguagem: Inglês

10.21273/jashs.114.5.809

2327-9788

Makoto Inaba, Kazuo Chachin,

Potato Plant Research

Abstract Mature-green tomatoes ( Lycopersicon esculentum M. cv. Sakata TVR) were stored at 5, 10, 15, 20, 25, 30, 35, or 40C. During storage, the respiration rate and C 2 H 4 production were suppressed at 5, 10, and 35C. Tomato ripening and ethylene production were suppressed and injury was obvious at 40C. Mitochondrial oxidation of malate, succinate, α-ketoglutarate, and citrate were significantly suppressed at 30 and 35C. The respiratory control ratios and ADP:O ratios of 35C were consistently lower than those at 25C. Tomato mitochondria developed the cyanide-insensitive pathway of respiration with increased storage temperature, especially at 30 and 35C, and with extended storage time. The NAD + -dependent malic enzyme increased at 35C, but malate dehydrogenase activity did not increase with ripening at 35C.