近40年来浙江省早稻推广品种的性状分析

Analysis of the early season varieties of indica rice released in Zhejiang province in recent 40 years

分析了近 4 0年来浙江省推广早籼稻品种的性状改良趋势。在 6 0— 90年代推广品种的播齐历期除 70年代较长外 ,其它年代选育品种都在 78天左右。近年来选育品种的株高有所增加 ,其营养生长更为旺盛。品种穗部性状 (穗长、每穗颖花数和每穗实粒数 )随着选育年代的推后而递增 ,分别为 6 0年代选育品种的 10 3.1%～ 10 5 .1% ,10 4 .9%～ 12 2 .8%和 10 6 .4 %～ 133.4 %。与 6 0年代选育的品种相比较 ,70— 90年代品种的抗瘟性和抗谱已分别从 3.5级提高到 2 .7级和 4 4 .2 %提高到 5 4 .5 %。

The improving prospect of rice breeding for early season indica rice ( Oryza sativa L.) was analyzed by using some cultivars released in Zhejiang province in 1960s-1990s.Results indicated that the duration from sowing to heading of rice released in 1970s was longer than that in other decades which was about 78 days. The plant height of new cultivars bred in later decades was higher and the biomass was larger.Some traits such as panicle length, grains of per panicle and fertilized grains of per panicle increased from 1970s to 1990s and were 103.1%-105.1%,104.9%-122.8% and 106.4%-133.4% of that in 1960s,respectively.Compared with the rice cultivars released in 1960s, the blast resistance of the rice cultivars bred in 1970s-1990s have been increased from 3.5 to 2.7 score for mean score and 44.2% to 54.5% for resistant spectrum.