Plant Physiol. Drug Metab Dispos
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Plant Physiology 62:295-298 (1978)
© 1978 American Society of Plant Biologists

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Articles

Abscission of Citrus Leaf Explants

No Correlation with Naphthaleneacetic Acid Conjugation in the Abscission Zone 1

Judith Wurzburger2 and Raphael Goren

Department of Horticulture, The Hebrew University of Jerusalem, Rehovot, Israel

The role of {alpha}-naphthaleneacetic acid (NAA) in the control of abscission in Citrus (Citrus sinensis L. Osbeck) leaf explants and its conjugation were studied in non-aged and 24-hour-aged explants. Dipping non-aged explants in 1.5 micromolar NAA for 15 minutes immediately after excision did not delay abscission whereas 150 micromolar NAA effectively delayed it. As incubation time was prolonged up to 24 hours after excision, the delaying effect of both concentrations gradually increased. In general, both concentrations did not delay abscission when applied to 24-hour-aged explants held for an additional period of up to 24 hours. The uptake and conjugation of 14C-NAA to glucose and aspartic acid were similar in petiole, abscission zone, and leaf blade of non-aged and aged tissues, for all NAA concentrations. No correlation was established between the kinetics of abscission and the rate of conjugation in the abscission zone.

2 On sabbatical leave from Bar-Ilan University, Reman-Gan, Israel. Present address: P. O. Box 11282, Tel Aviv, Israel.

1 This research was supported by grants from the World Bank and the Israel Ministry of Agriculture to R. G.






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Copyright © 1978 by the American Society of Plant Biologists