石斛属植物遗传多样性的RSAP分析（英文）

目的]用RSAP标记技术分析中国境内分布的33种野生石斛的遗传多样性及亲缘关系。方法]建立石斛RSAP-PCR反应体系,从45对RSAP引物中筛选出33对多态性引物,对33种野生石斛的基因组DNA进行PCR扩增。结果]这33对引物共扩增出2 047条带,其中多态性条带为2 044条,多态性比例99.8%,平均每对引物产生61.9条多态性条带。材料间遗传相似系数变化范围为0.081-0.442,说明本实验所测试的材料具有较广的遗传基础。根据RSAP标记的结果,采用UPGMA法进行聚类分析,将33种野生石斛分为6类。结果表明剑叶石斛和滇桂石斛之间亲缘关系最近,而华石斛与喇叭唇石斛、细叶石斛之间亲缘关系最远。结论]石斛具有丰富的遗传多样性,该研究可为石斛属的分类、育种及杂交亲本的选择提供分子水平依据。

Analysis of Genetic Diversity of Dendrobium by RSAP Marker

Objective] This study aimed to analyse the genetic diversity of and genet- ic relationship between 33 Dendrobium species by using RSAP （Restriction Site Amplification Polymorphism） marker technique. Method] A PCR-reaction system was established, by which 33 pairs of primers screened from 45 pairs were used to con- duct the PCR amplification. Results] The 33 pairs of primers produced 2 047 ampli- fied fragments, of which 2 044 were polymorphic, with a polymorphism rate of 99.8%, and each pair of primers produced 61.9 polymorphic fragments on average. The genetic similarity coefficients between species ranged from 0.081 to 0.442, sug- gesting that the experimental materials used in this study possess a wide genetic background. According to the result of RSAP, the 33 Dendrobium species were di- vided into 6 groups by the cluster analysis （UPGMA）. The result showed that the genetic relationship between D. acinaciforme and D. guangxiense was the closest, and that between D. sinense and either D. lituiflorum or D. hancockii was the fur- thest. Conclusion] The result suggested that Dendrobium germplasms have a great genetic diversity. This study provides a molecular basis for the classification and breeding of Dendrobium plants, as well as the selection of hybridization parents in the future.