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BR-INSENSITIVE1 regulates hydrotropic response by interacting with plasma membrane H+-ATPases in Arabidopsis
Wei Yuan1, Ying Li1, Luocheng Li1
1a Center for Plant Water-use and Nutrition Regulation and School of Life Sciences, Joint International Research Laboratory of Water and Nutrient in Crop , Fujian Agriculture and Forestry University , Jinshan Fuzhou , China.
Abstract:
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.
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