关键词: 水稻, 种质资源, 稻瘟病, 抗病性, 米质

Abstract:

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 1–6 scales, panicle neck blast of 1–5 scales and resistance frequency of 40.0%–100.0%, among them 20 germplasm rice 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%. 24 good quality rice germplasm resources were selected from 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 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.

Key words: Rice, Germplasm resources, Rice blast, Resistance, Grain quality