BRX mediates feedback between brassinosteroid levels and auxin signalling in root growth

Céline F. Mouchel, Karen S. Osmont and Christian S. Hardtke ()
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Céline F. Mouchel: University of Lausanne
Karen S. Osmont: University of Lausanne
Christian S. Hardtke: University of Lausanne

Nature, 2006, vol. 443, issue 7110, 458-461

Abstract: Plant hormones join forces Brassinosteroids and auxin are important regulators of plant growth, and the fact that the two pathways often regulate the same genes suggests that there must be some interaction between them. Exactly how they interact remains a mystery but new evidence suggests that the system kicks in pretty early. Even during the initial stages of embryogenic root growth, they communicate via a feedback loop, which maintains brassinosteroid levels in an auxin-dependent manner. In turn, brassinosteroid levels are rate-limiting for auxin-induced transcriptional responses. Many more Arabidopsis genes are sensitive to brassinosteroid levels than was previously thought, and the gene BREVIS RADIX, known to regulate cell proliferation and elongation in the root, is shown to be an important player in the brassinosteroid/auxin interaction.

Date: 2006
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DOI: 10.1038/nature05130

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