橄榄基因组DNA提取及RAPD扩增条件优化

以橄榄叶片为材料,进行橄榄基因组DNA提取及RAPD扩增条件优化。试验表明,采用改良的SDS法,提取的DNA质量较高,适宜于RAPD分析。在25μL反应体积中,RAPD反应的优化体系为:18.5μLddH2O,0.5μLdNTP,2.5μlBuffer,1μL引物,0.5μLDNA模板,2μLTaqDNA聚合酶。     

桑树随机扩增DNA多态性研究

改进桑叶ＤＮＡ分离方法后得到了纯度较高、分子量约２３ｋｂ的ＤＮＡ，用２４个随机引物进行ＰＣＲ扩增后，供试１２个桑品种显示出较丰富的ＤＮＡ随机扩增多态性。     

Studying the extent of genetic diversity among Gossypium arboreum L. genotypes/cultivars using DNA fingerprinting

Genetic diversity is an area of concern for sustaining crop yield. Information on genetic relatedness/diversity among Gossypium arboreum L. cultivars/genotypes is scanty. We have used random amplified polymorphic DNA (RAPD) analysis to assess the genetic divergence/relationship among 30 genotypes/cultivars of G. arboreum. Of 45 primers surveyed, 63% were polymorphic. Out of the total number of loci amplified, 36% were polymorphic. The calculated genetic similarity between the cultivars/genotypes was in the range of 47.05–98.73%. Two genotypes, HK-244 and Entry-17, were the most distantly related. The average genetic relatedness among all the genotypes was 80.46%. However, most of the cultivated varieties showed a close genetic relationship, indicating a narrow genetic base in comparison to the non-cultivated germplasm. The calculated coefficients were used to construct a dendrogram using the unweighted pair group of arithmetic means (UPGMA) algorithm, which grouped the genotypes/cultivars into two major and three smaller clusters. The study is the first comprehensive analysis of the genetic diversity of G. arboreum germplasm and identifies cultivars that will be useful in extending the genetic diversity of cultivated varieties and future genome mapping projects.     

用RAPD技术鉴定荷包红鲤抗寒品系

本利用RAPD技术对荷包红鲤抗寒品系的基因组DNA进行分析。通过对50个引物，150次的RAPD分析，找出了用RAPD技术从分子生物学角度对荷包红鲤抗寒品系进行鉴定的方法。