空间环境诱发水稻多蘖矮秆突变体的筛选与鉴定

SCREENING AND IDENTIFICATION OF TILLERING DWARF MUTANT OF RICE INDUCED BY SPACE ENVIRONMENT

对水稻品种丙 95 50 3经空间诱变处理产生的多蘖矮秆突变体R955进行主要农艺性状和矮生性鉴定。结果表明 ,R955在播种至抽穗天数、千粒重、籽粒体积、株型和谷粒着芒特性等性状上与ID 3等 5个已知矮秆基因的多蘖矮源明显不同。R955苗期对GA3反应不敏感 ,其矮生性受隐性矮秆基因控制 ,与d3、d10 、d14 、d17和d2 7基因均不等位。R955株高接近半矮生型 ,单株有效穗数多达 68个 ,株型良好 ,籽粒大小正常 ,在培育多穗型水稻品种上可能具有应用价值。

Major agronomic traits and dwarfism of the tiller dwarf mutant, R955, induced by space environment from rice variety Bing 95 503 were identified. The results indicated that the traits including days from sowing to heading, 1000 grain weight, grain volume, plant type and awn growing character were obviously different from those of the 5 tiller dwarfs such as ID 3, which were known for their dwarfing genes. R955 was insensitive to response of GA3, and its dwarfing gene was controlled by recessive gene(s), nonallelic to the tiller dwarfing genes d 3、d 10 、d 14 、d 17 and d 27 . R955 had good plant type with the plant height near semidwarfism, normal grain size, and as many as 68 productive panicles per plant.