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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (7): 1505-1517.doi: 10.16420/j.issn.0513-353x.2022-0521

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles     Next Articles

Studies on Genetic Variation of‘Tieguanyin’Tea Trees Asexual Reproduction Based on High-depth Genome Resequencing

HOU Binghao1, GAO Ting1, WEI Yuede2, GAO Shuilian1, CAI Yinbi3, CHEN Zhiming4, JIN Shan1, ZHANG Xingtan5, WANG Pengjie1,5,*(), YE Naixing1,*()   

  1. 1 Key Laboratory of Tea Science at Universities in Fujian,College of Horticulture,Fujian Agriculture and Forestry University,Fuzhou 350002,China
    2 Fujian Anxi Qishan Weiyin Famous Tea Co.,Ltd.,Quanzhou,Fujian 362431,China
    3 Fujian Bama Tea Industry Co.,Ltd.,Anxi,Fujian 362442,China
    4 Anxi Tea Industry Development Center,Anxi,Fujian 362400,China
    5 Agricultural Genomics Institute,Chinese Academy of Agricultural Sciences,Shenzhen,Guangdong 518120,China
  • Received:2022-12-05 Revised:2023-04-28 Online:2023-07-25 Published:2023-07-26
  • Contact: WANG Pengjie, YE Naixing

Abstract:

The genome of Camellia sinensis(L.)O. Kuntze‘Tieguanyin’mother tree and its three consecutive asexual reproductions and three‘Tieguanyin’trees from multi-generation that used for actual production were resequenced with over 50× in this study. Through SNP and InDel detection and annotation,it was found that most of the variants were located in intergenic regions,only 1.09%-1.13% of SNPs and 0.51%-0.61% of InDels were located in gene coding regions. In the whole genome and coding regions,the total number of mutation sites of the three consecutive asexual reproductions had little differences,and the number of genes involved in the mutation was basically the same in each sample. It was speculated that the varietal characteristics of‘Tieguanyin’had been generally stable during asexual reproduction. The KEGG(Kyoto Encyclopedia of Genes and Genomes)enrichment analysis showed that purine and carbohydrate metabolic pathways were significantly enriched in three ‘Tieguanyin’trees used for actual production,and the caffeine metabolic pathway was extremely significant enriched. It was speculated that some of the quality and flavor-related metabolic pathway genes were varied during the long-term asexual reproduction process in‘Tieguanyin’. Compared with the three consecutive asexual reproductions,the sequence of three genes such as FAR1WAT1,and MYB that related to growth and development and five genes such as PP2ABTB/POZBAT2RPP13,and Lr10 that related to stress response had been mutated in three‘Tieguanyin’trees used for actual production.

Key words: Camellia sinensis, asexual reproduction, resequencing, genetic variation