Research ArticlePlant biology

Signaling from the Endoplasmic Reticulum Activates Brassinosteroid Signaling and Promotes Acclimation to Stress in Arabidopsis

Sci. Signal.  28 Sep 2010:
Vol. 3, Issue 141, pp. ra69
DOI: 10.1126/scisignal.2001140

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Integrating Stress and Growth

Brassinosteroids (BRs) are plant hormones that control various aspects of plant growth and development. BR signaling has also been implicated in plants’ ability to tolerate environmental stresses. Regulated intramembrane proteolysis (RIP) that occurs in the Golgi liberates membrane-bound transcription factors in response to various forms of cellular stress, such as endoplasmic reticulum (ER) stress, heat, and salt stress. Che et al. identified two transcription factors, bZIP17 and bZIP28, that were cleaved through endomembrane RIP and activated by heat and ER stress to mediate tolerance to stress. This RIP pathway enhanced BR signaling, suggesting a mechanism by which plants may optimize growth during challenging environmental conditions.