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Genetic Diversity Analysis and Core Collection Construction of the Actinidia chinensis Complex (Kiwifruit) Based on SSR Markers

文献类型： 外文期刊

作者： Hu, Guangming 1 ; Jiang, Quan 1 ; Wang, Zhi 3 ; Li, Zuozhou 1 ; Liao, Wenyue 4 ; Shen, Dandan 4 ; Zhong, Caihong 1 ;

作者机构： 1.Chinese Acad Sci, CAS Key Lab Plant Germplasm Enhancement & Special, Wuhan Bot Garden, Wuhan 430074, Peoples R China

2.Univ Chinese Acad Sci, Coll Adv Agr Sci, Beijing 100049, Peoples R China

3.Hubei Acad Agr Sci, Inst Fruit & Tea, Wuhan 430064, Peoples R China

4.Yichang Acad Agr Sci, Yichang 443000, Peoples R China

关键词： A; chinensis; genetic diversity; microsatellites (SSR); core collection; germplasm

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2022 年 12 卷 12 期

页码：

收录情况： SCI

摘要： Kiwifruit belonging to the Actinidiaceae family is a perennial, dioecious vine called 'the king of fruits' due to its considerably nutritious and sweet characteristics. A. chinensis complex, including two main groups, A. chinensis var. chinensis and A. chinensis var. deliciosa, is a major component of Actinidia due to their huge economic value and the high degree of development and utilization. Wild resources are widely distributed in China, but are under serious threat due to extreme environments and destroyed habitats. Thus, it is of great significance for the conservation of kiwifruit resources and the sustainable development of the kiwifruit industry to evaluate the genetic diversity of existing genetic resources and to systematically construct a core collection of the A. chinensis complex. In this study, 40 high polymorphism microsatellites markers were used to investigate all accessions from the A. chinensis complex. A total of 888 alleles were marked with 22.2 alleles in each locus. The expected heterozygosity was 0.846, the observed heterozygosity was 0.622, the polymorphism information content was 0.835, and the Shannon information index was 2.369. Among these loci, the observed heterozygosity of 38 loci was lower than expected. The inbreeding coefficient was 0.257, which indicates that frequent hybridization occurred between close relatives. Analyses of molecular variance showed that genetic variations mainly came from the population. Finally, a core collection containing 93 accessions was constructed. The bank not only perfectly represented the genetic diversity of the original population, but also had excellent potential for development and utilization. Our research provides a crucial reference for the future conservation, germplasm identification, and genetic breeding of kiwifruit.

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