中国水稻科学(Chin J Rice Sci), 2022, 36(5): 476-486 476 DOI: 10.16819/j.1001-7216.2022.210813 水杨酸通过一氧化氮途径调控水稻缓解低磷胁迫朱春权1, #魏倩倩1, 2, #党彩霞3黄晶1徐青山1潘林1朱练峰1曹小闯1孔亚丽1项兴佳2刘佳4金千瑜1张均华1,*(1中国水稻研究所水稻生物学国家重点实验室,杭州 310006;2安徽大学,合肥 230039;3 宜宾学院,湖北宜宾 644000;4江西省农业科学院,南昌 330200;#共同第一作者;*通信联系人,email:*******************)Salicylic Acid Alleviates Low Phosphorus Stress in Rice via a Nitric Oxide-dependent MannerZHU Chunquan1,#, WEI Qianqian1,2,#, DANG Caixia3, HUANG Jing1, XU Qingshan1, PAN Lin1, ZHU Lianfeng1, CAO Xiaochuang1, KONG Yali1, XIANG Xingjia2, LIU Jia4, JIN Qianyu1, ZHANG Junhua1,*(1State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China; 2 Anhui University, Hefei 230039, China; 3 Yibin University, Yibin 644000, China; 4 Jiangxi Academy of Agricultural Sciences, Nanchang 330200; #These authors contributed equally to the work; *Correspondingauthor,E-mail:*******************)Abstract: 【Objective】It is of great importance to analyze the physiological and molecular mechanisms of salicylic acid(SA) regulating the response of rice to phosphorus(P) stress. 【Method】The conventional rice cultivar Nipponbare was used in our experiment, and the total P content, acid phosphatase activity, xylem P concentration, root parameters, expression levels of P transporter genes and nitric oxide (NO) content in rice were measured after exogenous SA application to explore the physiological and molecular mechanism that SA alleviates P deficiency stress in rice. 【Result】1) Application of 1 μmol/L SA significantly increased the total P content in rice under low P conditions. However, 5μmol/L SA decreased the total P content in rice, indicating SA had a dose effect on the regulation of P absorption in rice.2) Application of 1 μmol/L SA significantly increased the activity of acid phosphatase by 11.35%, total root length by20.90%, surface area by 11.86%, root volume by 15.38%, total root number by 23.55%, xylem P concentration by 22.6%.In addition, the application of 1μmol/L SA significantly increased the expression levels of P transporter genes, thereby increased the absorption of exogenous P and the transportation of internal P in rice under low P conditions. 3) SA increased the content of NO in rice roots by increasing the activity of nitrate reductase, so as to improve the absorption of P in rice under low phosphorus conditions via regulating the expression of P transporter genes. 【Conclusion】SA alleviates low phosphorus stress in rice by its interacting with the signal molecule of NO.Key words: rice; phosphorus; salicylic acid; absorption and transport; gene; nitric oxide摘要:【目的】深入剖析水杨酸调控水稻低磷胁迫响应的生理与分子机制具有重要意义。