Journal Article

Brassinosteroids Induce Entry into the Final Stage of Tracheary Element Differentiation in Cultured <i>Zinnia</i> Cells

Ryo Yamamoto, Taku Demura and Hiroo Fukuda

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 38, issue 8, pages 980-983
Published in print January 1997 | ISSN: 0032-0781
Published online January 1997 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029262
Brassinosteroids Induce Entry into the Final Stage of Tracheary Element Differentiation in Cultured Zinnia Cells

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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.

Keywords: Brassinosteroids; Cell death; Gene expression; Secondary wall formation; Tracheary element differentiation; Zinnia elegans

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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