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. 1992 Nov;100(3):1377–1383. doi: 10.1104/pp.100.3.1377

Effect of Brassinolide on Gene Expression in Elongating Soybean Epicotyls 1

Steven D Clouse 1,2,3, Daniel M Zurek 1,2,3, Trevor C McMorris 1,2,3, Michael E Baker 1,2,3
PMCID: PMC1075793  PMID: 16653132

Abstract

We have studied the effect of brassinolide (BR), a plant steroidal lactone, on the expression of auxin-regulated genes in soybean (Glycine max L. cv Williams 82) epicotyls. BR caused up to 4-fold increases in epicotyl length during extended assays at 10−7m, in the absence of added auxin. Structurally related steroids failed to induce elongation or to alter the BR effect. Northern blot analysis, using sequences corresponding to auxin-regulated genes as probes, has shown that the molecular mechanism of BR-induced elongation is likely to differ from that of auxin-induced elongation in this system. BR does not rapidly induce members of the GH, SAUR, or JCW auxin-inducible gene families before the onset of elongation. BR enhances SAUR and GH1 transcripts after 18 h but has no effect on JCW1 or GH3 transcripts at any time examined. We have shown by two-dimensional gel analysis of in vitro translated mRNA that a submicromolar concentration of BR alters the pattern of gene expression in elongating soybean epicotyls.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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