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First published online March 18, 2004; 10.1105/tpc.020479

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The Plant Cell 16:1060-1071 (2004)
© 2004 American Society of Plant Biologists

A Haplotype-Specific Resistance Gene Regulated by BONZAI1 Mediates Temperature-Dependent Growth Control in Arabidopsis

Shuhua Yang1 and Jian Hua1,2

Department of Plant Biology, Cornell University, Ithaca, New York 14853

2 To whom correspondence should be addressed. E-mail jh299{at}cornell.edu; fax 607-255-5407.

Plant growth homeostasis and defense responses are regulated by BONZAI1 (BON1), an evolutionarily conserved gene. Here, we show that growth regulation by BON1 is mediated through defense responses. BON1 is a negative regulator of a haplotype-specific Resistance (R) gene SNC1. The bon1-1 loss-of-function mutation activates SNC1, leading to constitutive defense responses and, consequently, reduced cell growth. In addition, a feedback amplification of the SNC1 gene involving salicylic acid is subject to temperature control, accounting for the regulation of growth and defense by temperature in bon1-1 and many other mutants. Thus, plant growth homeostasis involves the regulation of an R gene by BON1 and the intricate interplay between defense responses and temperature responses.




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