我国家蚕品种的变迁及现行品种种质基础分析

The Gradual Changes of the Silkworm Race and the Active Silkworm Race Germplasm Base in China

对国内蚕茧主产区当家蚕品种的变迁及近 1 0多年来国家审定通过的新品种分析后认为 ,大面积推广的蚕品种已完全是杂交种 ;近 1 0余年来国内新育成蚕品种的综合经济性状不断提高 ,但与日本同期蚕品种相比仍有一定差距。亲本利用趋于集中、品种亲缘关系相近、种质基础狭窄是造成这种差距的主要原因之一 ;

All the silkworm race of the main growing area become hybrid in China through the synthetic analysis of the gradual changes of main silkworm race in main cocoon area,and of be examined and approved new silkworm race from 1980 to 1995.The economical characters be increased continuously of new silkworm race breeded the last few years in China,but it still lags behind by comparison with the silkworm race in Japan at the same time ;The utilization of parents is tending to concentration,the consanguinity relationship of germplasm base trends to narrow,all of them is the main reason.There are plenty of danger in genetic weakness and exterminately disease.