The Use of Rice Varietal Diversity for Rice Blast Control  

作　　者：ZHUYou-yong CHENHai-ru FANJing-hua WANGYun-yue LIYan FANJin-xiang YANGShi-sheng MAGuan-liang CHENJian-bin LIZuo-shen LUBao-rong 

机构地区：[1]KeyLaboratoryofAgricultureBiodiversityorPlantDiseaseManagement,MinistryofEducation/keyLaboratoryofPlantPathology,YunnanAgricultrualUniversity,Kunnming650201,P.R.China [2]KeyLaboratoryforBiodiversityScienceandEcologicalEngineering,MinistryofEducation/InstituteofBiodiversityScience,FudanUniversity,Shanghai200433,P.R.China

出　　处：《Agricultural Sciences in China》2003年第4期400-408,共9页中国农业科学（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China and Natural Science Foundation of Yunnan(01NG10,01C0007Z,AA211091 and 30160048);the Shanghai Commission of Education(00XD14006).

摘　　要：Field experiments of mixed- (intercropping) and pure-planting (monoculture) of four rice varieties, representing improved hybrid varieties (Shanyou63 and Shanyou22) and high-quality traditional varieties (Huangkenuo and Zigu) from Yunnan Province, were conducted based on their differences in genetic background and agro-economical characteristics. The results demonstrated that the mixed-planting of the hybrid rice and high-quality traditional rice varieties had a significantly greater effect on controlling rice blast disease than the monoculture of these varieties, particularly the traditional ones. It is evident for the highly susceptible traditional varieties in mixed-planting to achieve disease control, with significant decreases in blast incidences and severity indexes. The blast control efficiency reached up to 83-98% under such planting model. This suggests that an appropriate mixed-planting of rice varieties with diverse genetic background and agro-economical characteristics is an effective approach for rice blast control. In addition, resistance of the traditional rice varieties to lodging was considerably increased in the plots with mixed-planting, compared with the plots with monoculture. The average rate of grain-yield increase ranged from 6. 5 to 9.7% in the plots with mixed-planting.Field experiments of mixed- (intercropping) and pure-planting (monoculture) of four rice varieties, representing improved hybrid varieties (Shanyou63 and Shanyou22) and high-quality traditional varieties (Huangkenuo and Zigu) from Yunnan Province, were conducted based on their differences in genetic background and agro-economical characteristics. The results demonstrated that the mixed-planting of the hybrid rice and high-quality traditional rice varieties had a significantly greater effect on controlling rice blast disease than the monoculture of these varieties, particularly the traditional ones. It is evident for the highly susceptible traditional varieties in mixed-planting to achieve disease control, with significant decreases in blast incidences and severity indexes. The blast control efficiency reached up to 83-98% under such planting model. This suggests that an appropriate mixed-planting of rice varieties with diverse genetic background and agro-economical characteristics is an effective approach for rice blast control. In addition, resistance of the traditional rice varieties to lodging was considerably increased in the plots with mixed-planting, compared with the plots with monoculture. The average rate of grain-yield increase ranged from 6. 5 to 9.7% in the plots with mixed-planting.

关 键 词：RICE Mixed-planting MONOCULTURE Variety diversity Rice blast control Yield 

分 类 号：S511[农业科学—作物学] S424