H2O2 and ABA signaling are responsible for the increased Na+ efflux and water uptake in Gossypium hirsutum L. roots in the non-saline side under non-uniform root zone salinity
文献类型： 外文期刊
作者： Kong, Xiangqiang 1 ; Luo, Zhen 1 ; Dong, Hezhong 1 ; Eneji, A. Egrinya 1 ; Li, Weijiang 1 ;
作者机构： 1.Shandong Acad Agr Sci, Cotton Res Ctr, Shandong Key Lab Cotton Culture & Physiol, Jinan 250100, Peoples R China
关键词： ABA;cotton;H2O2;Na+ efflux;non-uniform salinity;water use
期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）
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收录情况： SCI
摘要： Under non-uniform root zone salinity in cotton, roots in the saline side increased Na+ efflux and water uptake in the non-saline side through H2O2 and ABA signaling.Non-uniform root salinity increases the Na+ efflux, water use, and growth of the root in non-saline side, which may be regulated by some form of signaling induced by the high-salinity side. However, the signaling and its specific function have remained unknown. Using a split-root system to simulate a non-uniform root zone salinity in Gossypium hirsutum L., we showed that the up-regulated expression of sodium efflux-related genes (SOS1, SOS2, PMA1, and PMA2) and water uptake-related genes (PIP1 and PIP2) was possibly involved in the elevated Na+ efflux and water use in the the roots in the non-saline side. The increased level of indole acetic acid (IAA) in the non-saline side was the likely cause of the increased root growth. Also, the abscisic acid (ABA) and H2O2 contents in roots in the non-saline side increased, possibly due to the increased expression of their key biosynthesis genes, NCED and RBOHC, and the decreased expression of ABA catabolic CYP707A genes. Exogenous ABA added to the non-saline side induced H2O2 generation by up-regulating the RBOHC gene, but this was decreased by exogenous fluridone. Exogenous H2O2 added to the non-saline side reduced the ABA content by down-regulating NCED genes, which can be induced by diphenylene iodonium (DPI) treatment in the non-saline side, suggesting a feedback mechanism between ABA and H2O2. Both exogenous ABA and H2O2 enhanced the expression of SOS1, PIP1;7, PIP2;2, and PIP2;10 genes, but these were down-regulated by fluridone and DPI, suggesting that H2O2 and ABA are important signals for increasing root Na+ efflux and water uptake in the roots in the non-saline side.
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