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Plant and Cell Physiology, 1980, Vol. 21, No. 6 969-977
© 1980

Article

Physiological studies on the action of CCC in Kyoho grapes

Takafumi Tezuka, Hironori Sekiya and Hajime Ohno

Laboratory of Horticultural Science, Faculty of Agriculture, Nagoya University Chikusa, Nagoya 464, Japan

The physiological action of CCC for leaves of Kyoho grapes was studied. Leaves from the lower to upper positions of the primary shoots and (primary) lateral shoots showed uneven photosynthetic activities with peaks. The photosynthetic activity of each leaf from both shoots was increased by treatment with CCC, whereas respiratory activity was not affected with CCC. In the primary shoots, CCC treatment increased the contents of chlorophyll a and b in the leaves, but in the lateral shoots only chlorophyll b contents were increased. Dry weights of the leaves from the lateral shoots increased with CCC, but those of leaves located in the vicinity of nodes bearing the fruit clusters varied slightly or were almost the same as the dry weight of non-treated leaves. Leaf thickness was increased by CCC and paralleled the variation in dry weight. The leaf area was decreased by CCC.

(Received April 19, 1980; )
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