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Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (36): 112-119.doi: 10.11924/j.issn.1000-6850.casb2022-0069

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Taro Germplasm Resources: Genetic Diversity Analysis and Resistance Identification to Blight Based on SSR Markers

GUO Juxian1(), WU Tingquan2, LI Murong3, TANG Kang3, YAO Chunpeng1, LI Guihua1, LUO Wenlong1, WANG Rui2()   

  1. 1Vegetable Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Key Laboratory for New Technology Research of Vegetables, Guangzhou 510640
    2Institute of Facility Agriculture, Guangdong Academy of Agricultural Sciences, Guangzhou 510640
    3South China Agricultural University, Guangzhou 510642
  • Received:2022-02-11 Revised:2022-05-02 Online:2022-12-25 Published:2023-01-17

Abstract:

In order to investigate the genetic diversity of taro germplasm resources from different sources and detect their resistance to blight, 21 pairs of SSR marker primers with high polymorphism were screened out from 100 pairs of SSR marker primers, and were used to analyze the genetic diversity of taro resources. Meanwhile, the resistance of 109 germplasm resources was evaluated by inoculating taro Phytophthora artificially. Results showed that a total of 71 polymorphic alleles were detected and the number of alleles per locus ranged from 2 to 4 with an average of 3.38 alleles. The observed heterozygosity (Ho) ranged from 0.0481 to 0.8900 with an average of 0.3483. The expected heterozygosity (He) ranged from 0.0841 to 0.6709 with an average of 0.3794. The average Shannon genetic diversity index (I) was 0.6733, the genetic distance was between 0 and 1, and the average genetic distance was 0.6014. The taro germplasm resources were divided into three groups at the genetic distance of 0.49. More than 60% of resistant germplasm resources belonged to I and II groups. This study could provide a scientific basis for screening and identification of excellent taro germplasm resources and genetic breeding.

Key words: taro, germplasm resources, SSR marker, genetic diversity, resistance identification