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Plant and Cell Physiology, 1978, Vol. 19, No. 2 229-236
© 1978

Article

Ethylene-induced changes of chloroplast structure in Satsuma mandarin (Citrus unshiu Marc.)

Keishi Shimokawa, Akira Sakanoshita and Keiko Horiba

Faculty of Agriculture, Miyazaki University Miyazaki 880, Japan

Ethylene-induced changes of chloroplast structure in Satsuma mandarin (Citrus unshiu Marc.) were examined using light and electron microscopy. In ethylene-treated fruits, the number of chloroplasts decreased; this was especially remarkable in cells distant from the epidermis. Rapid reduction in chloroplast size was a characteristic feature.

The inner membrane system of the chloroplasts of ethylene-treated fruits disintegrated prior to the disintegration of other cell structures. The disintegration of the membranes within the chloroplasts was expressed by the word "melt". The double-layered structure of lamellar and granal membranes was degraded and the membrane layers became separated.

Another interesting feature was the appearance of finger-like protuberances and peripheral reticula in the chloroplasts of the ethylene-treated fruits.

(Received June 13, 1977; )
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