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. 2017 Jun 2;29(6):1425–1439. doi: 10.1105/tpc.17.00364

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© 2017 American Society of Plant Biologists. All rights reserved.

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Figure 7. — A Working Model of WRKY46/54/70 Function in Plant Growth and Stress Response.

(A) WRKY54 and BES1 protein decreased with increasing drought treatment time. The 8d, 9d, and 10d indicate days of drought treatment or controls.

(B) A working model of WRKY46/54/70 in BR-regulated growth and drought stress response. WRKY46/54/70 are regulated by BR signaling through BIN2 and BES1, and cooperate with BES1 to promote plant growth and inhibit drought responses. WRKY46/54/70 also slightly promote BR biosynthesis. Under normal growth conditions (left), WRKY46/54/70 and BES1 positively coregulate growth-related genes and negatively control the expression of drought-responsive genes to promote growth. BRs regulate WRKY46/54/70 both transcriptionally and posttranscriptionally through BES1 and BIN2, respectively. Under drought stress conditions (right), WRKY46/54/70 and BES1 protein are destabilized, which leads to repression of growth-related genes and alleviation of WRKY46/54/70’s inhibitory effect on drought-related genes, leading to reduced growth and increased drought tolerance.