We previously reported that ABA inhibits stomatal closure through AtNAP-SAG113 PP2C regulatory module during leaf senescence.The mechanism by which this module exerts its function is unknown.Here we report the identif...We previously reported that ABA inhibits stomatal closure through AtNAP-SAG113 PP2C regulatory module during leaf senescence.The mechanism by which this module exerts its function is unknown.Here we report the identification and functional analysis of SAG114,a direct target of the regulatory module.SAG114 encodes SnRK3.25.Both bimolecular fluorescence complementation(BiFC)and yeast two-hybrid assays show that SAG113 PP2C physically interacts with SAG114 SnRK3.25.Biochemically the SAG113 PP2C dephosphorylates SAG114 in vitro and in planta.RT-PCR and GUS reporter analyses show that SAG114 is specifically expressed in senescing leaves in Arabidopsis.Functionally,the SAG114 knockout mutant plants have a significantly bigger stomatal aperture and a much faster water loss rate in senescing leaves than those of wild type,and display a precocious senescence phenotype.The premature senescence phenotype of sag114 is epistatic to sag113(that exhibits a remarkable delay in leaf senescence)because the sag113 sag114 double mutant plants show an early leaf senescence phenotype,similar to that of sag114.These results not only demonstrate that the ABA-AtNAP-SAG113 PP2C regulatory module controls leaf longevity by dephosphorylating SAG114 kinase,but also reveal the involvement of the SnRK3 family gene in stomatal movement and water loss during leaf senescence.展开更多
植物在自然界中面临各种环境侵害时候,如干旱、盐、低温和病菌袭击,会启动自身的抵御机制来适应各种侵害。蔗糖非发酵相关的蛋白激酶(sucrose non-fermenting-1-related protein kinase,SnRK)是广泛存在于植物中的一类Ser/Thr蛋白激酶,...植物在自然界中面临各种环境侵害时候,如干旱、盐、低温和病菌袭击,会启动自身的抵御机制来适应各种侵害。蔗糖非发酵相关的蛋白激酶(sucrose non-fermenting-1-related protein kinase,SnRK)是广泛存在于植物中的一类Ser/Thr蛋白激酶,参与各种胁迫信号传导通路,对植物抵御不良环境起到重要作用。植物中蔗糖非发酵相关的蛋白激酶共有38个成员,可以分为3个亚家族:SnRK1、SnRK2和SnRK3。本文主要讨论SnRK家族的研究进展,揭示SnRK家族在植物抗逆中的重要作用。展开更多
基金Open access funding provided by Shanghai Jiao Tong Universitysupported by Cornell University.G.W.and X.L.were funded by scholarships from China Scholars Council.
文摘We previously reported that ABA inhibits stomatal closure through AtNAP-SAG113 PP2C regulatory module during leaf senescence.The mechanism by which this module exerts its function is unknown.Here we report the identification and functional analysis of SAG114,a direct target of the regulatory module.SAG114 encodes SnRK3.25.Both bimolecular fluorescence complementation(BiFC)and yeast two-hybrid assays show that SAG113 PP2C physically interacts with SAG114 SnRK3.25.Biochemically the SAG113 PP2C dephosphorylates SAG114 in vitro and in planta.RT-PCR and GUS reporter analyses show that SAG114 is specifically expressed in senescing leaves in Arabidopsis.Functionally,the SAG114 knockout mutant plants have a significantly bigger stomatal aperture and a much faster water loss rate in senescing leaves than those of wild type,and display a precocious senescence phenotype.The premature senescence phenotype of sag114 is epistatic to sag113(that exhibits a remarkable delay in leaf senescence)because the sag113 sag114 double mutant plants show an early leaf senescence phenotype,similar to that of sag114.These results not only demonstrate that the ABA-AtNAP-SAG113 PP2C regulatory module controls leaf longevity by dephosphorylating SAG114 kinase,but also reveal the involvement of the SnRK3 family gene in stomatal movement and water loss during leaf senescence.
文摘植物在自然界中面临各种环境侵害时候,如干旱、盐、低温和病菌袭击,会启动自身的抵御机制来适应各种侵害。蔗糖非发酵相关的蛋白激酶(sucrose non-fermenting-1-related protein kinase,SnRK)是广泛存在于植物中的一类Ser/Thr蛋白激酶,参与各种胁迫信号传导通路,对植物抵御不良环境起到重要作用。植物中蔗糖非发酵相关的蛋白激酶共有38个成员,可以分为3个亚家族:SnRK1、SnRK2和SnRK3。本文主要讨论SnRK家族的研究进展,揭示SnRK家族在植物抗逆中的重要作用。
