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六个肉牛群体RAPD变异及其与杂种优势关系的研究
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摘要
本文应用随机扩增多态性DNA(RAPD)技术分析了内蒙古地区6个肉牛群体利木赞(Lm)、夏洛来(CL)、安格斯(AG)、利木赞与蒙古牛的杂交牛(利蒙LM)、西门塔尔与蒙古牛的杂交牛(西蒙SM)和蒙古牛(M)的遗传结构、遗传变异及其与杂种优势的关系。在此基础上,对8个肉牛杂交组合的实际杂交效果与分子遗传距离进行了相关分析。结果表明:1)6个肉牛群体DNA具有丰富的多态性,并获得大量的多态性扩增带。所用80个随机引物中有17个引物的扩增带清晰且具有多态性,共产生191个位点,其中109个位点具有多态性,82个位点为公共位点,多态性带占总带数的57.07%,单个引物获得RAPD带数在2~12条之间,各片段大小在260bp~3500bp之间,所得多态性位点频率的变化范围为23.08%~80.00%。2)用Shannon指数计算6个群体遗传变异及其在群体内和群体间的分布,除蒙古牛群体外其它群体内遗传变异都较大,说明这些群体都有进行选育的潜力,总群体平均遗传多样性指数(Hsp)为0.4254,群体遗传分化指数(Gst)为0.3402。所研究的肉牛群体遗传变异主要在群体内,蒙古牛的遗传多样性较为贫乏。根据六个群体的RAPD扩增图计算群体遗传距离,结果表明父母本群体之间遗传距离为安格斯和利蒙的最大,其次为安格斯和蒙古牛,安格斯和西蒙,利木赞和西蒙,夏洛来和西蒙,夏洛来和利蒙,利木赞和蒙古牛,夏洛来和蒙古牛的最小。3)实际杂交组合杂种后代的生长性状测定和杂种优势率结果来看,三元杂交组合均大于二元杂交组合,杂种优势主要表现在初生重和6月龄重。杂种优势最大组合是安格斯和西蒙与安格斯和蒙古牛组合最大,其次是利木赞与西蒙和安格斯与利蒙组合。4)群体间遗传距离与肉牛生长性状及杂种优势率的相关分析表明:分子遗传距离与初生重和12月龄体重呈弱正相关关系,与6月龄体重呈中等正相关关系;遗传距离与初生重杂种优势率和6月龄体重杂种优势率呈弱正相关关系,与12月龄体重杂种优势率呈中等负相关关系。
Random amplified polymorphic DNA was used to analyze the genetic structure and genetic variation of six beef cattle populations and heterosis of beef cattle was predicted in Inner Mongolia region. Which were from Limousin、charolais、Angus、LM、SM、and M. Based on these. Correlation analysis Was made on actual cross effect and molecular genetic distance of eight beef cattle cross combinations. Which indicated: 1) There were rich diversity in six beef cattle populations DNA and acquired a large number of polymorphic amplified fragments. 17 primers out of using 80 primers can get clear polymorphic fragments is 57.07 % percent of RAPD fragments. The RAPD fragments of each primer is between 4~12. The molecular size of amplification products is between 260~3500bp. The polymorphism frequency of each primer ranged from 23.08% to 80%. 2) Shannon Index was used to calculate the genetic variation of six beef cattle populations and distribution of other populations but M is bigger. Which showed that all the populations have potentiality of selected breeding. The average index of genetic polymorphism of general population (Hsp) is 0.4254, and the genetic diversity index of population (Gst) is 0.3402. Studied on genetic variation of beef cattle populations was mainly within populations. Genetic diversity of M is poorer. According to RAPD mapping, the results indicated that the farthest genetic distance was found between AG and LM. That of AG and M, AG and SM, Lm and SM, CL and SM, CLand LM ,Lm and M Lwere the next the closet genetic distance was observed among CL and M. 3) According to the growth trait measement of actual cross combination offspring and heterosis ratio .The three breeds cross combination is better than two breeds AG×SM and AG×M combination is biggest in heterosis ratio of birth weight and 6-month weight , that of Lm×SM and AG×LM was the next. 4) The results from the correlation analysis between genetic distance with beef cattle growth trait and heterosis ratio indicated that: Molecular genetic distance was weak positive correlation with weight and 12-month weight and was moderate positive correlation with 6-month weight. It was also indicated that molecular genetic distance was weak positive correlation between 6-month weight heterosis ratio
    
    
    
    and birth weight heterosis ratio. Which was moderate negative correlation with 12-month weight heterosis ratio.
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