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Plant Physiology 59:1141-1145 (1977)
© 1977 American Society of Plant Biologists

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Articles

Temperature-induced Changes in Hill Activity of Chloroplasts Isolated from Chilling-sensitive and Chilling-resistant Plants

William G. Nolan and Robert M. Smillie

1 Plant Physiology Unit, CSIRO Division of Food Research and School of Biological Sciences, Macquarie University, North Ryde 2113, Sydney, Australia

The effect of temperature on Hill activity has been compared in chilling-sensitive and chilling-resistant plants. The Arrhenius activation energy (Ea) for the photoreduction of 2,6-dichlorophenolindophenol by chloroplasts isolated from two chilling-sensitive plants, mung bean (Vigna radiata L. var. Mungo) and maize (Zea mays L. cv. PX 616), increased at low temperatures, below 17 C for mung bean and below 11 C for maize. However, the Ea for this reaction in pea (Pisum sativum L. cv. Massay Gem), a chilling-resistant plant, likewise increased at temperatures below 14 C. A second change in Ea occurred at higher temperatures. The Ea decreased above about 28 C for mung bean, 30 C for maize, and 25 C for pea. At temperatures approaching 40 C, thermal inactivation of Hill activity occurred. These results, when taken together with previous results obtained with the chilling-resistant plant barley, indicate that chloroplasts from both chilling-sensitive and chilling-resistant plants can undergo a change in chloroplast membrane activity at low temperatures above freezing and that the presence of such a change in chloroplast membranes is not necessarily correlated with chilling sensitivity.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1977 by the American Society of Plant Biologists