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Plant Physiology 68:149-153 (1981)
© 1981 American Society of Plant Biologists

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Articles

Temperature-Induced Leakage from Chilling-Sensitive and Chilling-Resistant Plants 1,2

Robert E. Paull

Department of Botany—Hawaii Institute of Tropical Agriculture and Human Resources, University of Hawaii at Manoa, Honolulu, Hawaii 96822

Leakage rates were determined from leaf cells loaded with rubidium and [3H]leucine. There was a differential response between leucine and rubidium leakage depending upon the species used. The rate of leucine leakage shows a small decline below 5 C for two altitudinal variants of Lycopersicon hirsutum Humb. and Bonpl., whereas Lycopersicon esculentum L. showed a marked increase below 5 C. Rubidium showed a marked increase in leakage rate below 10 C with the altitudinal variants, with only a slight increase for the L. esculentum species. A rough relationship existed between rubidium leakage rate at 1 C and the altitude of origin of the L. hirsutum race, the low altitudinal forms having higher leakage rates than the higher altitudinal variants. The L. esculentum lines show a rubidium leakage response similar to that of the high altitude L. hirsutum variants. Higher leakage rates were obtained if the calcium concentration in the medium was less than 1 millimolar and upon addition of metabolic poisons and detergents.

The results are consistent with the view that chilling injury causes changes in the membrane and that cell leakage is an early symptom of this change in some species. Some chilling-sensitive species have increased leakage within 1 hour of exposure to chilling temperature.

1 Part of this research was done while the author was a Reserve Bank of Australia Rural Credits Development Fund Post-Doctoral Fellow working at the Plant Physiology Unit, Commonwealth Scientific and Industrial Research Organization, Division of Food Research and School of Biological Sciences, Macquarie University, North Ryde 2113, Australia.

2 Journal Series 2538 of the Hawaii Institute of Tropical Agriculture and Human Resources.






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Copyright © 1981 by the American Society of Plant Biologists