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《Acta Phytopathologica Sinica》 2005-06
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Resistance of rice major Pi-genes to the Magnaporthe grisea population in Fujian, China

LIU Wen-de, RUAN Zhi-ping, ZHENG Shi-qin, ZHAO Chang-jiang, ZHENG Wu, LU Guo-dong, WANG Zong-hua (The Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou 350002, China)  
To provide breeders with desired resistant resources and utilize these resources for improvement of the resistance, the resistance of 30 rice varieties with single Pi-genes were assayed by using 108 blast isolates which were collected from rice paddy-fields during 1995 to 2003 in Fujian Province, Southeast of China. The isolates were originally grouped into 30 virulence types based on their virulence on the near isogenic lines with the single resistance genes:Pil ,Pi2, Pi3, Pi4a, Pi4b, in which CO39 is used as the recurrent parent. The results showed that Pi-khis the most resistant followed by Pi-1 and Pi-9(t) with the resistance frequency of 98.15% ,87.04% and 84.26% , respectively, suggesting that these Pi-genes could be directly introgressed into current elite cultivars. We further calculated the resistance frequency of any two or three Pi gene combinations and found that most of these Pi-gene combinations provided very high resistance frequency, even no virulent isolates identified. The results indicated that pyramiding Pi-genes in the same cultivar will be the most effective way in breeding for resistance varieties. The phylogenetic relationship of the Pi-genes tested based on their compatibility with the isolates tested by clustering analysis will provide information for resistance gene pyramiding and deployment in integrated management of the rice blast disease.
【Fund】: 福建省重大基础项目(2003P008) 福建省自然科学基金重点资助项目(C9820003) 福建省“百千万”人才工程资助项目
【CateGory Index】: S511
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