一套优异稻种资源的纹枯病抗性评价

Evaluation of Rice Germplasm for Resistance to Rice Sheath Blight(Rhizoctonia solani)

2008年在湖北恩施、2009年和2010年在海南陵水分别采取自然诱病和人工接种方法对158份中国水稻微核心种质和137份"全球水稻分子育种计划"亲本材料进行了抗纹枯病大田鉴定和评价,未发现免疫材料,抗病和中抗材料的比例分别为0.3%和13.9%;大多数属于感病范围,中感、感病和高感材料的比例分别为40.0%、25.8%和20.0%。其中BR24、Hnankar、解放籼、秕五升、赤壳糯、红旗5号、泽谷、寸谷糯和旱麻稻在3年2地的鉴定中均达中抗水平;Serendahkuninmdaysia、SAI-BUI-BAO、Giza14和香稻在个别年份中达抗病水平。在海南2年试验中测定了各材料的纹枯病病级、相对病斑长、相对病斑高、抽穗期和株高,通过分析,发现纹枯病病级与相对病斑长和相对病斑高呈极显著正相关,而与抽穗期和株高呈极显著负相关,相对病斑长和相对病斑高可以作为抗性鉴定和评价的指标之一。

158 rice cuhivars from China mini core collection and 137 varieties breeding program＂ were identified and evaluated for resistance to rice sheath blight from the ＂global rice molecular using naturally induced and artificial inoculation methods in 2008 in Enshi, in 2009 in Hubei and in 2010 in Lingshui, Hainan. No immune germplasm was found. The percentage of resistant, moderately resistant, moderately susceptible, susceptible and highly susceptible germplasm were 0.3 %, 13.9%, 40.0%, 25.8 %, 20.0%, respectively. Most of the tested germplasm were susceptible. Nine varieties were identified as moderately resistant level across the three years. Serendahkunin- mdaysia, SAI-BUI-BAO, Gizal4 and Xiangdao reached the resistant level in some year. Correlation analysis showed that disease rate had significant positive correlations with relative lesion length and relative lesion height but significant negatively correlated with heading date, plant height. The ratio of lesion length and lesion height could be used to evaluate the resistance to rice sheath blight.