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PLANT PHYSIOLOGY , Vol 101, Issue 1 31-36, Copyright © 1993 by American Society of Plant Biologists
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ENVIRONMENTAL AND STRESS PHYSIOLOGY |
Correlation between the Circadian Rhythm of Resistance to Extreme Temperatures and Changes in Fatty Acid Composition in Cotton Seedlings
A. Rikin, J. W. Dillwith and D. K. Bergman
Departments of Botany (A.R.) and Entomology (J.W.D., D.K.B.), Oklahoma State University, Stillwater, Oklahoma 74078
Fluctuations in fatty acid composition were examined in cotton (Gossypium
hirsutum L. cv Deltapine 50) leaves during light-dark cycles of 12:12 h and
under continuous light and were correlated to the rhythmic changes in
chilling (5[deg]C) resistance (CR) and heat (53[deg]C) resistance (HR). The
chilling-resistant and chilling-sensitive phases developed in the dark or
the light period, respectively, and this rhythm persisted under continuous
light for three cycles. The heat-resistant phase developed in the light
period and an additional peak of HR occurred in the middle of the dark
period. Under continuous light, only one peak of HR developed, lasting from
the middle of the subjective night to the middle of the subjective day. The
amounts of palmitic and oleic acids were constant during the light-dark
cycle and under continuous light, but those of linoleic and linolenic acids
fluctuated, attaining a high level in the middle of the dark period or the
subjective night, and a low level in the middle of the light period or the
subjective day. A low temperature of 20[deg]C induced CR and affected
changes in fatty acid composition similar to those that occurred during the
daily CR phase. A high temperature of 40[deg]C induced HR but did not
affect changes in fatty acid composition. The results in their entirety
show that the CR that develops rhythmically as well as the
low-temperature-induced CR coincide with increased levels of
polyunsaturated fatty acids. No correlation is found between changes in
fatty acid composition and the HR that develops rhythmically or the
high-temperature-induced HR.
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