Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (7): 1222-1233.DOI: 10.3969/j.issn.1004-1524.2021.07.08

• Horticultural Science • Previous Articles     Next Articles

Genetic diversity analysis and construction of DNA fingerprint of yam (Dioscorea oppositeac Thunb.) germplasm by cpSSR marker

ZHANG Jingzhen1,2(), WANG Lianjun2, LEI Jian2, CHAI Shasha2, YANG Xinsun2,*(), ZHANG Wenying1,*()   

  1. 1. College of Agriculture, Yangtze University, Jingzhou 434025, China
    2. Hubei Key Laboratory of Food Crops Germplasm and Genetic Improvement, Institute of Food Crops, Hubei Sweet Potato Engineering and Technology Research Centre, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
  • Received:2020-07-21 Online:2021-07-25 Published:2021-08-06
  • Contact: YANG Xinsun,ZHANG Wenying

Abstract:

In order to provide molecular foundation for the innovative parental selection and the varieties improvement of Dioscorea oppositeac Thunb. germplasm, in present study, the molecular fingerprints of 64 accessions of D. oppositeac from home and abroad were mapped and the genetic diversity was analyzed using cpSSR molecular markers technology. The results showed that 10 pairs of primers were selected from 21 pairs of cpSSR primers.The genome DNA of 64 accessions of D. oppositeac germplasm were amplified by 10 pairs of cpSSR primers with stable amplification, high polymorphism selected from 21 pairs of primers. Sixty-nine bands were got totally, of which 59 were polymorphic bands, and the rate of polymorphic bands reached as high as 85.51%. The average number of observed alleles (Na) was 2, the mean effective allele (Ne) was 1.569 3 (1.231 1-1.916 0), and the average Shannon’s information index was 0.560 6(0.329 0-0.671 1), the average Nei’s genetic diversity index (He) was 0.378 1 (0.184 8-0.478 1),indicating a rich genetic diversity. Based on genetic similarity coefficient (GS), which ranged from 0.55 to 0.93, the phylogenetic relationships of 64 D. oppositeac germplasm resources were analyzed. When the threshold value of genetic similarity coefficient was 0.63, all the tested materials could be clustered into 4 classes. With the principle of identifying 64 D. oppositeac germplasm resources with a minimum number of primers, 2 pairs of primers were used to successfully construct DNA fingerprint.

Key words: Dioscorea oppositeac Thunb., germplasm resources, cpSSR molecular marker, DNA fingerprint, genetic diversity

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