Seidavi Alireza, Goldsmith Marian R
Animal Science Department, Rasht Branch, Islamic Azad University, Rasht, Iran
Biological Sciences Department, University of Rhode Island, Kingston, RI 02881.
J Insect Sci. 2014 Jan 1;14. doi: 10.1093/jisesa/ieu150. Print 2014.
The experiments reported here were conducted to investigate the effect of selection on three quantitative traits, namely cocoon weight, cocoon shell weight, and cocoon shell percentage, during four generations by rearing six pure breeds of domesticated silkworm, Bombyx mori L. (Lepidoptera: Bombycidae) of Chinese and Japanese origin compared with random unselected groups as controls. All stages of rearing and data recording were performed over four rearing periods, with generations 1-3 during successive spring seasons and generation 4 during the autumn season in year 3. Each pure line contained two groups of selected and random (control) groups. Comparisons included the effect of selection methods, pure line, and generation on the phenotypic values. We found strong main effects of pure line, generation, sex, and group and support for nearly all interactions between these main effects for all three response traits. The results indicated that cocoon weight and cocoon shell weight in the selected group were higher than in the control or nonselected group. Both selected and nonselected groups had the lowest cocoon weight, cocoon shell weight, and cocoon shell percentage in the fourth generation when environmental conditions during the autumn season were less favorable than spring. The cocoon weight and cocoon shell weight averages were higher for nonselected groups in the second and third generations, and for the selected group in the first generation due to the direct effect of selection.
本文所报道的实验旨在研究选育对三个数量性状的影响，这三个性状分别是茧重、茧层重和茧层率。实验通过饲养六个中国和日本原产的家蚕（鳞翅目：蚕蛾科）纯系品种四代，并与随机未选育组作为对照来进行。饲养和数据记录的所有阶段在四个饲养时期内完成，第1 - 3代在连续的春季，第4代在第3年的秋季。每个纯系包含两组选育组和随机（对照）组。比较内容包括选育方法、纯系和世代对表型值的影响。我们发现纯系、世代、性别和组存在显著的主效应，并且几乎支持这三个响应性状的所有这些主效应之间的相互作用。结果表明，选育组的茧重和茧层重高于对照组或未选育组。当秋季环境条件不如春季时，选育组和未选育组在第四代的茧重、茧层重和茧层率均最低。由于选育的直接作用，未选育组在第二代和第三代的茧重和茧层重平均值较高，而选育组在第一代较高。
