柞蚕茧质性状的遗传效应与杂种优势分析  

Analysis of Genetic Effect and Heterosis on Cocoon Quality Characters in Tussah Silkworm

作　　者：徐亮[1] 吴艳[1] 刘凤云[1] 孟宪民[1] 戚俐[1] 焦阳[1] 宿桂梅[1] 车明秋[1] 

机构地区：[1]辽宁省蚕业科学研究所,辽宁凤城118100

出　　处：《蚕业科学》2011年第1期130-133,共4页ACTA SERICOLOGICA SINICA

基　　金：公益性行业(农业)科研专项(No.nyhyzx07-020-07)

摘　　要：为了解柞蚕茧质性状的遗传规律和群体杂种优势的表现,对柞蚕3个品种采用完全双列杂交试验设计,利用加性-显性遗传模型(AD模型)和MINQUE(1)统计分析方法分析柞蚕茧质性状的遗传表现。结果表明:全茧量和茧层量同时受加性基因和显性基因的控制,茧层率则主要受显性基因的控制;遗传率的大小顺序为全茧量>茧层量>茧层率;3个茧质性状均表现为正向的群体平均优势,且F2代的优势减半;全茧量表现为负向的群体超亲优势,茧层量F1代的群体超亲优势不明显,F2代表现为负向的群体超亲优势,茧层率则表现为正向的群体超亲优势。3个供试柞蚕品种中,582的全茧量和茧层量具有较高的基因加性效应值,适合作为高全茧量和茧层量育种的杂交亲本。In order to understand the genetic behavior and display of population heterosis of the cocoon quality traits of tussah silkworm, genetic behavior of cocoon quality traits from 3 tussah silkworm varieties were analyzed by utilizing a complete diallel cross design, an additive-dominance genetic model （AD model）, and MINQUE （1） statistic approach. The results showed that cocoon weight and cocoon shell weight were controlled by both additive and dominant genes, but cocoon shell rate was mainly controlled by dominant genes. The order of heritability from high to low was. cocoon weight 〉 cocoon shell weight 〉 cocoon shell rate. The 3 cocoon quality traits all showed positive heterosis over mid-par- ents, and heterosis of F2 generation was half to that of F1 generation. Cocoon weight showed negative heterosis over bet- ter-parents. The heterosis over better-parents of cocoon shell weight of F1 generation was not obvious. Cocoon shell weight of F2 generation showed negative heterosis over better-parents, but cocoon shell rate of F2 generation showed positive heterosis over better-parents. Among the 3 tested tussah silkworm varieties, cocoon weight and cocoon shell weight of variety 582 had relatively higher effect value of additive genes, being suitable as cross parent for breeding new varieties with high cocoon weight and cocoon shell weight.

关 键 词：柞蚕 全茧量 茧层量 茧层率 遗传效应 杂种优势 

分 类 号：S885.1[农业科学—特种经济动物饲养]