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Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (11): 2455-2470.doi: 10.16420/j.issn.0513-353x.2021-0876

• Research Notes • Previous Articles     Next Articles

Genetic Relationship Analysis of the Population Germplasms of Section Thea with Unstable Ovary Locule Number Based on SLAF-seq

WU Zhijun1,5, LI Wei2, WANG Xinghua3, ZHANG Cheng2, JIANG Xun4, LI Sheng1, LUO Liyong1,5, SUN Kang1,5,*(), ZENG Liang1,5,*()   

  1. 1College of Food Science,Southwest University,Chongqing 400715,China
    2Nanchuan District’s Agricultural Characteristic Industry Development Center of Chongqing Municipality,Chongqing 408400,China
    3Tea College,Yunnan Agricultural University,Kunming 650201,China
    4Tea Science Research Institute of Pu-erh City of Yunnan Province,Pu’er,Yunnan 665000,China
    5Tea Research Institute,Southwest University,Chongqing 400715,China
  • Received:2021-12-02 Revised:2022-06-13 Online:2022-11-25 Published:2022-11-25
  • Contact: SUN Kang,ZENG Liang E-mail:sunkang@swu.edu.cn;zengliangbaby@126.com

Abstract:

In order to further explore the genetic relationship of the population germplasms of section Thea with unstable ovary locule number(ovary glabrous,3-5 loculed,style 3-5 lobed)(UONG),and to clarify whether the variation of individuals in the population caused interspecific variation,the simplified genome sequencing and molecular marker analysis of 87 germplasms of section Thea and other sections(outgroup comparison)of genus Camellia from Chongqing,Yunnan,and other provinces of China were carried out by SLAF-seq technology. A total of 2 804 071 SLAF labels were obtained by sequencing,and the average sequencing depth was 11.73×. A total of 25 069 219 SNP molecular markers were obtained by comparing the reference genome with SALF labels. Based on high consistency SNP data,using the methods of phylogenetic tree,genetic structure,and PCA analysis,the investigated germplasms were basically divided into three types,namely,the germplasms of section Thea and other sections of genus Camellia from Yunnan and other provinces(ClassⅠ),the population germplasms of big tea tree in Chongqing(ClassⅡ),and the Ser. Sinenses germplasms(common cultivated varieties and‘Chuanxiaozhong’)from multiple provinces(Class Ⅲ). The section Thea germplasms of ClassⅠwere composed of Ser. Guinquelocularis,Ser. Pentastyla,Ser. Gymnogynae,and Ser. Sinenses. ClassⅡ included UONG and Ser. Sinenses(morphological characteristics are between UONG and common Ser. Sinenses). Moreover,the FST values of genetic differentiation coefficient showed that the degree of genetic differentiation between ClassⅡgermplasms and other types of germplasms was the highest(> 0.3),and there was also high genetic differentiation between ClassⅠand Class Ⅲgermplasms(> 0.2). The classification results and FST values of simplified genome sequencing showed that the investigated UONG are relatively independent and the variation of individuals within the population did not cause interspecific variation. Therefore,it is reasonable to classify these germplasms into one species. Moreover,there is a type of Ser. Sinenses germplasms with cross genetic structure of UONG in Chongqing,which may be the offspring of natural distant hybridization.

Key words: section Thea, ovary locule number, genetic relationship, SLAF-seq, SNP

CLC Number: