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茅莓与插田泡遗传关系的RAPD和ISSR分析及疑似杂种初步鉴定
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摘要
悬钩子属Rubus L.,是蔷薇科Rosaceae中的一个大属。全世界有悬钩子属植物750-1000种,中国有200多种,其中有130多种是特有种。我国西南地区是悬钩子属植物的多样性分布中心,拥有丰富的种质资源,其野生资源在各种抗性、易成活性、果实风味都优于从国外引进的栽培品种,具有重要的栽培价值和育种价值。本研究在形态学调查的基础上利用RAPD和ISSR分子标记技术对33份材料属空心莓组(Sect. Idaeobatus)属绒毛叶亚组(Subsect. Stimulantes Yu& Lu)的茅莓(R. parvifolius)16份、属柔毛叶亚组(Subsect. Pungentes (Focke) Yu&Lu)的插田泡(R. coreanus)16份以及新发现的疑似杂种1份(该杂种疑为茅莓×插田泡自然杂交所产生)进行了遗传差异分析和初步鉴定。主要结果如下:
     1.通过优化反应体系,确立了茅莓和插田泡在ISSR分析中引物的最佳退火温度。即每个引物由于其碱基数目和组合的不同,退火温度有明显差异,但又与本身Tm值无规律可循,在筛选出的效果较好的引物退火温度范围在55.2-59.1℃,为ISSR技术在茅莓和插田泡中应用打下了基础。
     2.从UBC#9(哥伦比亚大学开发的一套共100条ISSR引物)引物中筛选出.12个多态性强、稳定性好、重复性高的ISSR引物,用于33份茅莓和插田泡的ISSR分析。扩增DNA片段长度在200-4000bp之间,多集中于400-2000bp之间。扩增DNA谱带总数358条,多态性条带339条,多态性达94.69%。得到了12个引物对33份茅莓和插田泡材料清晰的指纹图谱,能够充分鉴定种间和种内关系。
     3.利用已筛选出的18条随机引物,对供试的33份茅莓与插田泡材料进行RAPD分析。扩增DNA片段长度在200-4000bp之间,多集中于400-2000bp之间。扩增谱带总数498条,其中多态性条带462条,多态性达92.77%。得到的清晰指纹图谱,亦能够充分鉴定种间和种内关系。
     4.依据RAPD和ISSR标记数据,分别计算出33份茅莓与插田泡材料的遗传相似系数,并将供试材料划分为2大类。UPGMA聚类分析显示与形态学上分类结果基本一致。茅莓和插田泡各自种内的体现出一定的地理差异。
     5.通过RAPD和ISSR分析,对疑似杂种的可能亲本进行了推定,认为该疑似杂种可能为茅莓和插田泡的自然杂种。
     6.通过RAPD和ISSR对茅莓和插田泡种群遗传关系分析,RAPD和ISSR的重复性和稳定性得到了进一步验证,且ISSR比RAPD表现出更好的多态性,也为更好地利用DNA分子标记提供依据。
The genus Rubus is one of the largest genera in the Rosaceae, consisting of 750-1000 species in many parts of the world, of which about 200 species with more than 130 native have been recorded in China. The southwest part of China which is abound in resources, is now the center of distribution of Rubus. The disease resistance, easily activity and fruit flavors in its wild plants which have important cultural and breeding value, are all superior than cultivars introduced from abroad. In this study, RAPD and ISSR were used to analyze the total 33 accessions with 16 taxa from Subsect. Stimulantes Yii & Lu,16 taxa from Subsect. Pungentes (Focke) Yii & Lu and 1 taxa from the progeny originated from R. parvifolius cross R. coreanus. The results were as follows:
     1. Through optimizing the ISSR reaction system, the optimal annealing temperatures for ISSR primers were found. The annealing temperatures were related to the bases of each primer, while were less related to the Tm value. The selected range of temperature,55.2-59.1℃, would be helpful for utilizing ISSR on R. parvifolius and R. coreanus.
     2.12 primers screened from UBC#9 primers, which amplified 358 repeatable loci, including 339 polymorphic loci, were applied on the 33 materials. The percentage of polymorphic bands was 92.77% and the long of fragments were between 200bp and 4000bp, mostly between 400bp and 2000bp. The ISSR fingerprints from 12 Primers can identify the relationships between interspecies and intraspecies exactly.
     3.18 primers which amplified 498 repeatable loci, including 462 polymorphic loci, were applied on the 33 materials. The percentage of polymorphic bands was 92.77% and the long of fragments were between 200bp and 4000bp, mostly between 400bp and 2000 bp. The RAPD fingerprints from 18 Primers can identify the relationships between interspecies and intraspecies exactly.
     4. According to RAPD and ISSR markers, genetic distance was computed. All materials can be divided into 2 groups which were in consistence with that of the analysis of morphology. Division of subsets in some groups were related to the geography difference of R. parvifolius and R. coreanus.
     5. The possible parents of suspected hybrid was concluded by RAPD and ISSR analysis, and it was considered that the suspected hybrid was a natural hybrid between R. parvifolius and R. coreanus.
     6. In this study, reproducibility and stability of RAPD and ISSR was proved. ISSR showed the better polymorphic compared with RAPD, and this would be helpful for DNA molecular maker.
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