优质和抗稻瘟病的水稻种质资源筛选

测定了40份水稻种质资源对稻瘟病的抗性、碾米及外观品质。结果表明，40份品种高抗至中抗稻瘟病，抗病频率为40.0%～100.0%，其中20份达80%以上。40份品种对优势小种群ZB群平均抗病频率为80.0%，对重要小种群ZA群的平均抗病频率为70.2％，对ZC群的平均抗病频率为80.5%。从中筛选出24份碾米品质和外观品质较优的抗稻瘟病种质材料，其出糙率76.1%～80.9%，精米率68.7%～72.6%，整精米率35.7%～64.3%，垩白粒率5%～30%，垩白度1.2%～12.7%，长宽比2.7～3.6，其中6份的碾米品质和外观品质达国家三级优质标准，4份达国家二级优质标准。这些优质抗源材料对选育高产、优质、抗稻瘟病新品种（组合）具有重要利用价值。

Screening for Good Quality Rice Germplasm Resources Resistant to Rice Blast

The blast resistance and milling and appearance grain quality of 40 rice germplasm resources were evaluated.The 40 rice germplasm resources had high or moderate resistance to rice blast with leaf blast severity of 16 scales,panicle neck blast of 1-5 scales and resistance frequency of 40.0%-100.0%,among them 20 rice germplasm resources had over 80% of resistance frequency.The average resistance frequency of the 40 resources to dominant ZB race group,important ZA race group and ZC race group were 80.0%,70.2% and 80.5% respectively.While the susceptible check variety Shanyou 63 had high susceptibility with leaf blast of 9 scales,panicle neck blast of 9 scales and resistance frequency of 6.7%.Twenty-four good quality rice germplasm resources were selected from the 40 resources with brown rice rate of 76.1%-80.9%,milled rice rate of 68.7%-72.6%,head rice rate of 35.7%-64.3%,chalkiness rate of 5%-30%,chalkiness degree of 1.2%-12.7%,grain length/width ratio of 2.7-3.6.The milling and appearance quality of 6 rice germplasm resources reached the third grade of the national high quality rice standards and that of 4 rice germplasm resources reached the second grade.The resources are important for breeding new high-yield and good quality varieties or hybrid rice combinations resistant to rice blast.