Salt stress adversely affects plant growth,development,and crop yield.Rice(Oryza sativa L.)is one of the most salt-sensitive cereal crops,especially at the early seedling stage.Mitogen-activated protein kinase(MAPK/MP...Salt stress adversely affects plant growth,development,and crop yield.Rice(Oryza sativa L.)is one of the most salt-sensitive cereal crops,especially at the early seedling stage.Mitogen-activated protein kinase(MAPK/MPK)cascades have been shown to play critical roles in salt response in Arabidopsis.However,the roles of the MPK cascade signaling in rice salt response and substrates of Os MPK remain largely unknown.Here,we report that the salt-induced Os MPK4-Ideal Plant Architecture 1(IPA1)signaling pathway regulates the salt tolerance in rice.Under salt stress,Os MPK4 could interact with IPA1 and phosphorylate IPA1 at Thr180,leading to degradation of IPA1.Genetic evidence shows that IPA1 is a negative regulator of salt tolerance in rice,whereas Os MPK4 promotes salt response in an IPA1-dependent manner.Taken together,our results uncover an Os MPK4-IPA1 signal cascade that modulates the salt stress response in rice and sheds new light on the breeding of salt-tolerant rice varieties.展开更多
克隆鉴定了一个水稻促分裂原活化蛋白激酶（mitogen-activated protein kinases, MAPK）基因OsMPK4．OsMPK4基因cDNA全长1483bp，包含一个1131bp的开放阅读框，编码一个由376个氨基酸组成的蛋白，预测分子量为42．8kD．OsMPK4基因位于...克隆鉴定了一个水稻促分裂原活化蛋白激酶（mitogen-activated protein kinases, MAPK）基因OsMPK4．OsMPK4基因cDNA全长1483bp，包含一个1131bp的开放阅读框，编码一个由376个氨基酸组成的蛋白，预测分子量为42．8kD．OsMPK4基因位于水稻第10号染色体上，由6个外显子和5个内含子组成．OsMPK4蛋白具有MAPK的11个保守结构域及磷酸化位点TEY模体．系统进化树分析表明，OsMPK4属于B组MAPK成员，与已知水稻MAPK蛋白有56％～74％的一致性．原核表达了OsMPK4基因，纯化获得重组OsMPK4融合蛋白，并构建OsMPK4的转基因双元载体，用于OsMPK4的生化功能及其生物学功能研究．展开更多
基金supported by the National Natural Science Foundation of China (31788103, 32122064, 32122012)the Chinese Academy of Sciences (XDA24030504, 2019099)+1 种基金China Agricultural Research System (CARS-01-4)the China Postdoctoral Science Foundation (2019M650885)
文摘Salt stress adversely affects plant growth,development,and crop yield.Rice(Oryza sativa L.)is one of the most salt-sensitive cereal crops,especially at the early seedling stage.Mitogen-activated protein kinase(MAPK/MPK)cascades have been shown to play critical roles in salt response in Arabidopsis.However,the roles of the MPK cascade signaling in rice salt response and substrates of Os MPK remain largely unknown.Here,we report that the salt-induced Os MPK4-Ideal Plant Architecture 1(IPA1)signaling pathway regulates the salt tolerance in rice.Under salt stress,Os MPK4 could interact with IPA1 and phosphorylate IPA1 at Thr180,leading to degradation of IPA1.Genetic evidence shows that IPA1 is a negative regulator of salt tolerance in rice,whereas Os MPK4 promotes salt response in an IPA1-dependent manner.Taken together,our results uncover an Os MPK4-IPA1 signal cascade that modulates the salt stress response in rice and sheds new light on the breeding of salt-tolerant rice varieties.
文摘克隆鉴定了一个水稻促分裂原活化蛋白激酶（mitogen-activated protein kinases, MAPK）基因OsMPK4．OsMPK4基因cDNA全长1483bp，包含一个1131bp的开放阅读框，编码一个由376个氨基酸组成的蛋白，预测分子量为42．8kD．OsMPK4基因位于水稻第10号染色体上，由6个外显子和5个内含子组成．OsMPK4蛋白具有MAPK的11个保守结构域及磷酸化位点TEY模体．系统进化树分析表明，OsMPK4属于B组MAPK成员，与已知水稻MAPK蛋白有56％～74％的一致性．原核表达了OsMPK4基因，纯化获得重组OsMPK4融合蛋白，并构建OsMPK4的转基因双元载体，用于OsMPK4的生化功能及其生物学功能研究．
