家蚕四元杂交新组合云蚕1×云蚕2的选育

SELECTION OF A NEW TETRAVARIATE HYBRID COMBINATION OF SILKWORM YUNCAN 1 × YUNCAN 2

通过中国系统二化性品种间杂交,筛选出中×中杂交原种,定名为“云蚕1”;又用日本系统品种间杂交育种,筛选出日×日杂交原种,定名为“云蚕2”.云蚕1×云蚕2的正反交具有卵形大,卵化齐,眠性快,食桑旺,蚕体大,抗性强,容易饲养等优点;在经济性状上具有茧型大,茧层率高,茧丝长,解舒易,净度好,丝质优的特点。这个四元杂交新组合经不同季别、不同海拔多点试养,结果证明适合云南春秋兼用,经济效益好,己在全省推广.

Through the cross by Chinese line × Chinese line, a hybrid mother variety of silkworm was selected, and named as Yuncan l;and another hybrid mother variety was selected and named as Yuncan 2 through a cross by Japanese line × Japanese line.The reciprocal crosses of the combination Yuncan 1 × Yuncan 2 had many adevantages,such as large eggs,uniform hatching,short dormancy,good appetite,high resistance to diseases, big silkworm bodies and easy raising. As to the economic characteristics, they had the features of big cocoon, high percentage of cocoon shell,long silk length,easy seperating of cocoon,good purity and superior quality.Through the experimental raising in dfferent seasons and at different altitudes inYunnan, it was proved that this tetravariate hybrid combination was suitable to be used as a good variety either in spring or autumn in Yunnan,with good economic profit,and has been popularized through the province,