云南30个水稻品种对水稻白叶枯病的抗性评价

Evaluation of resistance to rice bacterial blight in 30 rice cultivars in Yunnan

【目的】水稻白叶枯病是一种严重危害水稻的细菌性病害,培育抗性品种是治理该病害的重要途径。因此,明确云南水稻材料对检疫性病害水稻白叶枯病的抗性,可以为该病害的防治与监测、水稻栽培的合理布局和良好抗性资源的获取提供依据。【方法】采用剪叶接种法测定云南稻区30个品种对7个不同致病型白叶枯病菌的抗性。【结果】在供试的30个云南水稻品种中,2个品种(玉粳16和JS42糯稻)对7个不同致病型菌株均表现为抗性;15个品种对7个致病型菌株均表现感病;对HEN11、SCYC-6、YN7、YN11、FUJ、YN241和PX099等7个致病型菌株表现抗性的水稻品种分别占26.67%、16.67%、23.33%、13.33%、6.67%、10.00%和20.00%。此外,区试材料的抗性比例高于主栽品种,地方稻未发现抗性品种。【结论】现在生产上的大部分水稻品种对优势致病型病原菌入侵的抵抗能力降低甚至丧失。针对云南地区的优势致病小种FUJ筛选得到2个抗性品种:玉粳16和JS42糯稻。

【Aim】Rice bacterial blight is a serious disease of this major staple crop. Landraces often contain resistence genes useful for breeding,so testing such cultivarscan provide a basis for the prevention and control of rice diseases. 【Method】Resistance to 7different pathogenic Xanthomonas oryzae pv. oryzae strains of 30 local rice cultivars from Yunnan Province was tested by leaf inoculation. 【Result】Among the 30 tested rice cultivars,two showed resistance to all 7 pathogenic strains,while 15 cultivars were susceptible to all pathogenic strains tested. The measured levels of resistance to the 7 different pathogenic strains ranged from 6. 67% to26.67%. In addition,the resistance ratio of regional trial materials was higher than that of the main cultivars. No resistance was found in the local rice.【Conclusion】Most of the cultivars in production have reduced or lost ability to withstand the dominant pathogenic bacteria. Cv.s Yujing 16 and Nuodao JS42 were the resistant cultivars against the dominant pathogenic race FUJ in Yunnan Province.