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Plant and Cell Physiology, 1997, Vol. 38, No. 8 980-983
© 1997

Rapid Report

Brassinosteroids Induce Entry into the Final Stage of Tracheary Element Differentiation in Cultured Zinnia Cells

Ryo Yamamoto, Taku Demura and Hiroo Fukuda1

Botanical Gardens, Faculty of Science, University of Tokyo 3-7-1, Hakusan, Tokyo, 112 Japan

1To whom requests for reprints should be addressed. Fax number, 81-3-5684-8597; e-mail, sfukuda{at}hongo.ecc.u-tokyo.ac.jp.

To elucidate the involvement of brassinosteroids in the progression of tracheary element differentiation in cultured Zinnia cells, we analyzed the effects of uniconazole, an inhibitor of brassinosteroid synthesis, and brassinolide, a biologically active brassinosteroid, on the accumulation of mRNAs for various genes that were expressed in different stages of differentiation. Uniconazole specifically suppressed the accumulation of transcripts for genes that were induced in the final stage of differentiation in association with secondary wall formation and cell death. This suppression was recovered with the addition of brassinolide. These results strongly suggest that endogenous brassinosteroids induce entry into the final stage of differentiation.

(Received June 7, 1997; Accepted July 1, 1997)
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