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BR-INSENSITIVE1 regulates hydrotropic response by interacting with plasma membrane H+-ATPases in Arabidopsis

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posted on 2018-08-01, 21:09 authored by Wei Yuan, Ying Li, Luocheng Li, Wei Siao, Qian Zhang, Yingjiao Zhang, Jianping Liu, Weifeng Xu, Rui Miao

Arabidopsis roots sense the moisture gradient in soils and grow toward an area with higher water potential – a process called hydrotropism. Our previous study has shown that the apoplastic proton extrusion in root tips is influenced by brassinosteroids (BRs) receptor BR-INSENSITIVE1 (BRI1) and is crucial for hydrotropic response in Arabidopsis. Here we show that BRI1 interacts directly not only with Arabidopsis plasma membrane H+-ATPase 2 (AHA2) but also with Arabidopsis plasma membrane H+-ATPase 7 (AHA7). Therefore, BRI1 may affect hydrotropic response via regulating the activities of AHA2 and AHA7.

Funding

This work was supported by the National Natural Science Foundation of China (Nos. 31600209,31761130073,31422047), National Basic Research Program of China (Nos. 2013CB127402 and 2012CB114300), Research Grant of Fujian Agriculture and Forestry University (KXGH17005).

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