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Plant and Cell Physiology, 1981, Vol. 22, No. 5 847-854
© 1981

Article

Effects of Cycloheximide and Light on Leaf Senescence in Maize and Hydrangea

Che-Jun Pjon

Biological Institute, Faculty of Science, Korea University Ogawa Cho, Kodaira, Tokyo 187, Japan

The senescence of maize and hydrangea leaves after detachment and darkening was studied in terms of the loss of chlorophyll and protein. Chlorophyll contents of the detached leaves decreased in the dark in both plants. Cycloheximide at 0.1 mM effectively inhibited the loss of chlorophyll in maize, but did not do so in hydrangea. Continuous irradiation with white light of 4.6 Wm–2 prevented the loss of chlorophyll in hydrangea leaves, while it caused bleaching of maize leaves. Reducing agents such as ascorbic acid and glutathione did not prevent the bleaching by light. In maize leaves, the amount of protein decreased in the dark more slowly than that of chlorophyll, and cycloheximide slightly prevented the protein decrease. Continuous light irradiation of 4.6 Wm–2 delayed the loss of protein more effectively than cycloheximide did.

(Received January 31, 1981; Accepted May 21, 1981)
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