Polyamine oxidase 3 is involved in salt tolerance at the germination stage in rice  

作　　者：Guangyu Liu Wanxia Jiang Lei Tian Yongcai Fu Lubin Tan Zuofeng Zhu Chuanqing Sun Fengxia Liu 

机构地区：[1]State Key Laboratory of Plant Physiology and Biochemistry,China Agricultural University,Beijing 100193,China [2]National Center for Evaluation of Agricultural Wild Plants(Rice),Beijing Key Laboratory of Crop Genetic Improvement,Laboratory of Crop Heterosis and Utilization,MOE,Department of Plant Genetics and Breeding,China Agricultural University,Beijing 100193,China

出　　处：《Journal of Genetics and Genomics》2022年第5期458-468,共11页遗传学报（英文版）

基　　金：supported by self-regulated projects of the State Key Laboratory of Plant Physiology and Biochemistry;National Natural Science Foundation of China (3137158)

摘　　要：Soil salinity inhibits seed germination and reduces seedling survival rate,resulting in significant yield reductions in crops.Here,we report the identification of a polyamine oxidase,OsPAO3,conferring salt tolerance at the germination stage in rice(Oryza sativa L.),through map-based cloning approach.OsPAO3 is up-regulated under salt stress at the germination stage and highly expressed in various organs.Overexpression of OsPAO3 increases activity of polyamine oxidases,enhancing the polyamine content in seed coleoptiles.Increased polyamine may lead to the enhance of the activity of ROS-scavenging enzymes to eliminate over-accumulated H;O;and to reduce Na;content in seed coleoptiles to maintain ion homeostasis and weaken Na;damage.These changes resulted in stronger salt tolerance at the germination stage in rice.Our findings not only provide a unique gene for breeding new salt-tolerant rice cultivars but also help to elucidate the mechanism of salt tolerance in rice.

关 键 词：Polyamine oxidase OsPAO3 Salt tolerance Germination stage RICE 

分 类 号：S511[农业科学—作物学]