论文部分内容阅读
水稻品种的抗性鉴定:1973～1977年在稻瘟病圃中,筛选出对穗颈瘟4～5年保持中抗以上的品种15个,1975～1977年又鉴定出对穗颈瘟3年均保持中抗以上的品种47个。在病圃中对大量水稻品种抗性鉴定材料的统计分析表明,籼稻品种的叶片对稻瘟病菌抗侵入和抗扩展能力强的品种数量比粳稻多。穗颈和主轴则不同,在病圃中粳稻叶瘟发生较重的年份,籼稻抗侵入的品种数量比粳稻多,反之,籼稻比粳稻少。但在同一抗病等级中,粳稻造成的损失多比籼稻轻,表现耐病性强的品种数量比籼稻多。根据多年和多点试验,绝大部分品种在不同地区和不同年份之间抗性表现不一致。就叶瘟和穗颈瘟抗性变化情况相比,叶瘟抗性变化较穗颈瘟大。
Resistance identification of rice varieties: From 1973 to 1977 in the blast furnace nursery, screened for panicle blast 4 to 5 years to maintain resistance to more than 15 varieties from 1975 to 1977 and identified 3-year blast panicle blast To maintain the above anti-47 varieties. The statistical analysis of the resistance identification materials of a large number of rice varieties in the nursery showed that the indica rice varieties had more anti-invasive and anti-expandable varieties than the japonica rice varieties. The panicle neck and the major axis are different. In the nursery, where the japonica leaf blast occurred heavier, the number of introgression resistant varieties in indica rice was more than that in japonica rice. On the contrary, the indica rice was less than japonica rice. However, in the same disease resistance level, the damage caused by japonica rice is more than that of indica rice, and the number of varieties with high disease resistance is more than that of indica rice. Based on years of trials and multi-point tests, most of the cultivars showed inconsistent resistance in different regions and years. Compared with the changes of leaf blast and panicle blast resistance, the change of leaf blast resistance was larger than that of panicle blast.