【目的】盐胁迫是制约水稻生长和产量主要逆境之一,研究盐胁迫响应基因对于了解植物耐盐机理和培育耐盐水稻品种具有重要意义。类受体蛋白激酶RLK（receptor-like protein kinases）广泛参与调控植物细胞信号转导和对逆境胁迫的响应过程。本研究的目的是分析盐胁迫下四个RLK基因的表达模式和生物学功能。【方法】通过荧光定量PCR检测4个RLK基因在NaCl处理下的表达变化以及在不同组织器官中的表达情况,同时利用CRISPR/Cas9对4个RLK基因分别进行编辑。【结果】4个RLK基因的转录均受NaCl诱导或抑制,其中Os04g0275100基因和Os07g0541900基因主要在根中表达;Os09g0353200基因主要在叶片中表达;Os01g0852100基因在根、茎、叶、叶鞘中均有表达。通过测序分别筛选到4个基因的功能缺失突变体,耐盐性实验结果表明四个基因的突变体对NaCl的敏感程度与野生型一致。【结论】鉴定的4个RLK基因的转录受NaCl调控且表达具有组织特异性,突变单个RLK基因不影响水稻的耐盐性。为进一步揭示盐胁迫下RLK基因的功能和作用机制奠定了基础。

【Objective】Salinity stress is one of the main harsh environmental factor that greatly hinders rice growth and production, and it is meaningful to study salt-responsive genes for understanding the mechanisms behind plant response to salt stress and breeding salt tolerance variety. The receptor-like protein kinases are involved in regulation of plant cell signaling and responding to stress. In this study, we analyzed the expression pattern and function of four RLKs under salt stress. 【Method】 Quantitative real-time PCR was employed to detect the expression level of the four RLKs under NaCl treatment and its tissue specificity. 【Results】The transcription of Os04g0275100 was induced by NaCl, which was expressed mainly in roots. The transcription of Os07g0541900 was inhibited by NaCl, which was expressed mainly in roots. The transcription of Os09g0353200 was inhibited by NaCl, which was expressed mainly in leaves. The transcription of Os01g0852100 was inhibited by NaCl, which was expressed in roots, shoots, leaves and sheath. Loss-of-function mutants of the four RLKs were obtained by sequencing, which exhibited the identical response to NaCl as compared with the wild-type. 【Conclusion】The expression of the four RLKs identified in this study were regulated by NaCl and were tissue-specified. Mutation of one of the four RLKs has no effects on rice salt tolerance. This study lays a basis for revealing the biological function and mechanisms of RLKs under salt stress.