Plant Physiol.
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Plant Physiology 63:280-282 (1979)
© 1979 American Society of Plant Biologists

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Role of Ethylene in Abscisic Acid-induced Callus Formation in Citrus Bud Cultures 1

Raphael Goren, Arie Altman and Israel Giladi

a Department of Horticulture, The Hebrew University of Jerusalem, Rehovot 76-100, Israel

The induction of callus formation in cultured buds of Shamouti orange (Citrus sinensis [L.] Osbeck) by abscisic acid (ABA) is a multiphasic process. (Altman, and Goren 1974 Physiol Plant 32: 55.) A study of the mediation by ethylene on this effect of ABA was undertaken. It was found that: (a) ethylene and (2-chloroethyl) phosphonic acid, as well as ABA, induced callus formation; (b) callus induction is best attained when explants are exposed to ethylene during the 1st day after excision; and (c) ABA-induced callus formation is inhibited by rhizobitoxine analog, an inhibitor of ethylene biosynthesis. It is concluded that the effect of ABA on callus formation is mediated via ethylene.

1 This research was supported by a grant to A. A. and R. G. from the United States-Israel Binational Science Foundation (BSF), Jerusalem, Israel.






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Copyright © 1979 by the American Society of Plant Biologists