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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (30): 54-60.doi: 10.11924/j.issn.1000-6850.casb2022-0862

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41 Tea Germplasm Resources: Genetic Diversity and Relationship Analysis Based on SSR Molecular Markers

CAI Yiming1(), JIANG Shuangfeng1, MAO Guangzhi2, LI Mengdi2, DIAO Hailong2, WU Pengfei2, LI Junling1   

  1. 1 Tea Research Institute, Xinyang Academy of Agricultural Sciences, Xinyang, Henan 464000
    2 School of Life Sciences, Xinyang Normal University, Xinyang, Henan 464000
  • Received:2022-10-23 Revised:2023-01-15 Online:2023-10-19 Published:2023-10-19

Abstract:

In order to conduct preliminary identification and evaluation of tea tree germplasm resources in southern Henan, 41 clonal varieties from the tea germplasm resources garden in southern Henan were used as materials to analyze genetic diversity and relationships by SSR marker.The results showed that 26 pairs of primers with good amplification were screened from 33 pairs of primers. A total of 102 bands were amplified from 26 pairs of primers, the average number of bands amplified by each pair of primers was 4, the minimum number was 2, and the maximum number was 7. The average number of observed alleles was 2, the average number of effective alleles was 1.8664, the average Nei's genetic diversity was 0.4626, the average Shannon information index was 0.6550, the maximum value of polymorphic information of primers was 0.80, the minimum value was 0.23, and the average value was 0.62. The results of cluster analysis showed that 41 materials were divided into 4 groups at the similarity coefficient of 0.5. Most of the materials with similar geographical origin and genetic background were clustered together, and the genetic distance of the tested varieties was 0.08-1.87. This indicated that the genetic foundation among varieties in the resource garden was relatively broad.

Key words: tea, southern Henan, germplasm resources garden, genetic diversity, relationships, SSR marker