An endophytic fungus interacts with the defensinlike protein OsCAL1 to regulate cadmium allocation in rice  

作　　者：Tianyu Gu Ziai Qi Yating Wang Siying Chen Jing Yan Huapeng Qiu Yanxuan Yu Zjun Fang Junmin Wang Jiming Gong 

机构地区：[1]National Key Laboratory of Plant Molecular Genetics,Shanghai Center for Plant Stress Biology,CAS Center for Excellence in Molecular Plant Sciences,Chinese AcademyofSciences,Shanghai200032,China [2]School of Life Science and Technology,ShanghaiTech University,Shanghai 201210,China [3]University of the Chinese Academy of Sciences,Beijing 100049,China [4]Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization,College of Life Science,Hunan University of Science and Technology,Xiangtan411201,China [5]State Key Laboratory of Crop Stress Adaptation and Improvement,School of Life Sciences,Henan University,Kaifeng 475004,China [6]Institute of Crops and Nuclear Technology Utilization,Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,China

出　　处：《Molecular Plant》2024年第2期312-324,共13页分子植物（英文版）

基　　金：This research was supported by the National Science Foundation of China(U20A2024);the STI2030-Major Project(2023ZD04072),and the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB27020101).

摘　　要：Defensin-like proteins are conserved in multicellular organisms and contribute to innate immune re-sponses against fungal pathogens.In rice,defensins play a novel role in regulating cadmium(Cd)efflux from the cytosol.However,whether the antifungal activity of defensins correlates with Cd-efflux function remains unknown.In this study,we isolated an endophytic Fusarium,designed Fo1o,by a comparative mi-crobiome analysis of rice plants grown in a paddy contaminated with Cd.Fo10 is tolerant to high levels of Cd,but is sensitive to the defensin-like protein OsCAL1,which mediates Cd efflux to the apoplast.We found that Fo10 symbiosis in rice is regulated by OsCAL1 dynamics,and Fo10 coordinates multiple plant pro-cesses,including Cd uptake,vacuolar sequestration,efflux to the environment,and formation of Fe pla-ques in the rhizosphere.These processes are dependent on the salicylic acid signaling pathway to keep Cd levels low in the cytosol of rice cells and to decrease Cd levels in rice grains without any yield penalty.Fo10 also plays a role in Cd tolerance in the poaceous crop maize and wheat,but has no observed effects in the eudicot plants Arabidopsis and tomato.Taken together,these findings provide insights into the mech-anistic basis underlying how afungal endophyte and host plant interact to control Cd accumulation in host plants by adapting defense responses to promotethe establishment ofa symbiosis that permits adaptation to high-Cd environments.

关 键 词：defensin-like protein Fusarium oxysporum ENDOPHYTE cadmium allocation 

分 类 号：S511[农业科学—作物学]