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Plant Physiology 70:211-214 (1982)
© 1982 American Society of Plant Biologists

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Diurnal Changes in the Chilling Sensitivity of Seedlings

Ann I. King, Michael S. Reid and Brian D. Patterson1

Department of Environmental Horticulture, University of California, Davis, Davis, California 95616

Seedlings of tomato (Lycopersicon esculentum, Mill.) varied diurnally in their sensitivity to chilling temperatures. If chilled near the end of the dark period when they were most sensitive, the time taken to kill half of the seedlings was approximately 3 days, whereas in samples taken 4 hours after the onset of dark, a period of 6 days of chilling was required. Sensitivity dropped rapidly after the onset of the light period. This rhythm was exogenously controlled by the diurnal changes in light, rather than in the temperature. The susceptibility of predawn seedlings could be reduced by exposure to light, by water stress, or by abscisic acid applied to the leaves. However, the subsequent changes in sensitivity to chilling did not correlate with stomatal aperture. Six other chilling-sensitive species showed similar diurnal changes in their chilling sensitivity.

1 B. D. P. was supported by a grant from the Australian Department of Science under the United States/Australian agreement. Present address: CSIRO Division of Food Research, P. O. Box 52, North Ryde, New South Wales 2113, Australia.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1982 by the American Society of Plant Biologists