Marker-Assisted Introgression of Quantitative Resistance Gene pi21 Confers Broad Spectrum Resistance to Rice Blast  

作　　者：Rosalyn B.ANGELES-SHIM Vincent P.REYES Marilyn Mdel VALLE Ruby S.LAPIS Junghyun SHIM Hidehiko SUNOHARA Kshirod K.JENA Motoyuki ASHIKARI Kazuyuki DOI 

机构地区：[1]Plant Breeding Division,International Rice Research Institute,DAPO Box 7777,Metro Manila,the Philippines [2]Bioscience and Biotechnology Center,Nagoya University,Chikusa-ku Furo-cho,Nagoya,Aichi 464-8601,Japan [3]Graduate School of Bioagricultural Sciences,Nagoya University,Chikusa-ku Furo-cho,Nagoya,Aichi 464-8601,Japan [4]Department of Plant and Soil Science,College of Agricultural Sciences and Natural Resources,Texas Tech University,Lubbock,Texas 79409,USA

出　　处：《Rice science》2020年第2期113-123,共11页水稻科学（英文版）

基　　金：supported by the Japan International Cooperation Agency as part of the Wonder Rice Initiative for Food Security and Health (WISH) Project;in part by the Canon Foundation and the SATREPS project entitled ‘Improvement in Productivity and Yield Stability of Rice under Kenya’s Biotic and Abiotic Stress Conditions Through Tailor-made Breeding and Development of Cultivation Methods’.

摘　　要：The quantitative resistance gene pi21 from Sensho was introgressed to an indica breeding line IR63307-4B-13-2,a pyramiding line IRBB4/5/13/21,and a tropical japonica line Kinandang Patong by marker-assisted backcrossing.A total of 192 improved lines at the BC4F3 and BC4F4 generations were developed and confirmed to have the gene introgression via genotyping using a pi21-specific InDel marker.Thirteen randomly selected improved lines,representing all the three genetic backgrounds,demonstrated resistance against leaf blast composites in the field and a broader spectrum resistance against individual isolates compared to the recurrent parents in the glasshouse.Specifically,the tested lines exhibited pi21-acquired resistance against 11 leaf blast isolates that elicited susceptible reactions from the recurrent parents.All the tested lines maintained a comparative heading date,and similar or improved panicle length,number of primary branches per panicle and number of total grains per panicle relative to the recurrent parents.The physical grain characteristics of the recurrent parents were also maintained in the 13 lines tested,although variability in the amylose content and chalkiness degree was observed.The successful marker-assisted introgression of pi21 in diverse genetic backgrounds and the resulting broader spectrum resistance of improved lines against leaf blast indicate the potential of pi21 for deployment in cultivars grown across other rice growing regions in Asia.

关 键 词：rice BLAST pi21 gene marker-assisted BREEDING disease RESISTANCE 

分 类 号：S435.111.41[农业科学—农业昆虫与害虫防治]