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《Chinese Journal of Rice Science》 2017-01
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Analysis on Resistance of Pi Genes to Predominant Races of Mangnaporthe oryzae in Fujian Province,China

RUAN Hongchun;SHI Niuniu;DU Yixin;GAN Lin;YANG Xiujuan;DAI Yuli;CHEN Furu;Institute of Plant Protection,Fujian Academy of Agricultural Sciences;Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests;  
【Obiective】The rational utilization and deployment of the blast resistance in rice varieties are key factors that ensures the durability and effectiveness of resistance genes.To determine the resistance and utilization potential of 24 single major resistance genes in Fujian Province,【Method】we tested the physiological races and pathotypes of 347 single spore isolates of Magnaporthe oryzae which were isolated from susceptible rice cultivar"Lijiangxintuanheigu"from different rice growing areas within Fujian Province between 2012-2015 by using seven Chinese host differentials and six CO39 near-isogenic lines(CO39 NILs) respectively.We further performed an assay to monitor the resistance frequencies of 24 single resistance genes with these isolates.【Result】Subsequently,we observed that the seven Chinese host differentials clearly differentiated the347 isolates into six distinct groups with 36 physiological races.The dominant groups were ZA,ZB and ZC,and the dominant physiological races were ZC15,ZD7 and ZB15.In addition,we noticed that the six CO39 NILs differentiated the 347 isolates into 17 pathotypes with I34.1 as the dominating pathotypes.Particularly,the resistance spectrums associated with the 24 resistance gene were larger and ranged from 9.80 to 89.91% when inoculated with the 347 isolates.For the eight resistance genes Pi-k~m,Pi-7(t),Pi-9(t),Pi-k~p,Pi-k,Pi-k~h,Pi-z5 and Pi-ta(1),their resistance spectrums were above 70.00%.【Conclusion】These results indicated that the eight resistance genes could be successfully deployed in Fujian Province,and further demonstrated that rice breeding approaches could be combined with multiple resistance genes in widely grown hybrids or cultivars.Furthermore,the recorded resistance spectrums of eight genes for dominant physiological races and pathotypes were above 69.00% and adequately proved that the use of dominant physiological races or pathotypes as a method for identifying resistance or resistance spectrums in rice cultivars was reliable.
【Fund】: 国家公益性行业(农业)科研专项(201203014);; 福建省属公益类科研院所基本科研专项项目(2015R1024-1 2016R1023-11);; 福建省科技厅项目(2009N2005)
【CateGory Index】: S435.111.41
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