实用蚕品种"夏芳"淡色卵的初步研究

品种的种性维持与变因分析是农业上十分重要的课题。对蚕品种夏芳的淡色卵现象进行了初步研究,结果为：①淡色卵有以蛾区为单位的棕褐色和区内少量出现的果绿色卵两种主要情况,为蚕卵浆液膜色素不同造成;②对淡色卵代表型蛾区和深色卵区蚕卵的卵色素进行层析法分析,结果棕褐色卵区缺少深色卵的深黄色素;③淡色卵区幼虫发育经过稍短,但体重、健康性与深色卵区无明显差异;④淡色卵区原蚕结茧性、茧质成绩与深色卵无明显差异;⑤淡色卵区母蛾产卵粒数明显多于深色卵区母蛾产卵粒数,但蚕卵受精率、良卵率和越年卵孵化率等卵质成绩比后者差,同时淡色卵胚胎发育整齐度稍次。因此认为淡色卵对养蚕成绩不会有明显影响,但对繁育系数可能产生一定影响。此外,经采用漂白粉液涂抹桑叶饲养和对照区次代卵色的调查,初步认为棕褐色卵区的产生与漂白粉液浸消桑叶无必然联系,但有增大蛾区内卵色深浅差异的趋向。

Studies on Light Colour Eggs of Commercial Strain "Xiafang" of Silkworm

Analysis of the relation between maintaining characteristics of a strain and the changed factors is a significant topic in agriculture.We investigated the light colour eggs of silkworm race "Xiafang",the result indicates that tannish brown egg in whole batch and mixed with little green eggs within batch are the two main types of light colour eggs.It is caused by the difference of pigment of serous membrane in the eggs.Laminar analysis the pigment of eggs in typical batch of the light colour eggs and dark colour eggs batch showed that eggs of the latter are shortage of deep yellow pigments of the dark colour eggs.The development progress of the larval in the light colour batch is shorter than the dark one,but the body weight and health of the larvals is no obviously difference between them.Cocooning of parent silkworm and cocoon quality of light colour batch is no obviously difference compared with dark colour eggs too.The Amount of Egg Laying of the female moth in light colour batch is more than that of the dark one obviously,but the quality of silkworm eggs,such as fertility rate,rate of good eggs and hatchability of hibernating egg are lower than the latter,meanwhile,The uniform degree of embryonic development of light colour eggs is also lower than that of dark one slightly.Therefore,it is consider that light colour eggs don't influence the rearing performance obversily,but is may be made a certain effect on propagation coefficient.In addition,investigating egg color of silkworm rearing with mulberry leaves daubed bleaching liquid and the control indicated brown egg has no necessary relation with mulberry leaves daubed bleaching liquid.but mulberry leaves daubed bleaching liquid seems to increase egg color discrepancy.