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

2018; Taylor & Francis; Linguagem: Inglês

10.1080/15592324.2018.1486147

1559-2324

Wei Yuan, Ying Li, Luocheng Li, Wei Siao, Qian Zhang, Yingjiao Zhang, Jianping Liu, Weifeng Xu, Rui Miao,

Plant Stress Responses and Tolerance

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.