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中国农学通报 ›› 2026, Vol. 42 ›› Issue (18): 150-158.doi: 10.11924/j.issn.1000-6850.casb2025-0842

• 生物科学 • 上一篇    下一篇

遂川狗牯脑茶树本地群体种叶绿体基因组序列特征和密码子偏好性分析

尹明华(), 董佳颖, 陈丽彦, 李均焱, 邓芸, 黄佳   

  1. 上饶师范学院生命科学学院, 江西上饶 334001
  • 出版日期:2026-09-25 发布日期:2026-09-24
  • 作者简介:

    尹明华,女,1973年生,江西吉安人,教授,硕士,主要从事茶树生物技术研究。通信地址:3304001 江西省上饶市信州区志敏大道401号 上饶师范学院,Tel:0793-8153721,E-mail:。

  • 基金资助:
    国家自然科学基金资助项目“江西铅山红芽芋超低温疗法脱毒抑制细胞凋亡抗早衰的机理研究”(32060092); 上饶师范学院大学生创新创业训练计划校级项目“遂川狗牯脑茶树群体种叶绿体基因组密码子偏好性分析与基因功能相关性研究”(2025-CX-09)

Sequence Characteristics and Codon Bias Analysis of Chloroplast Genomes in Local Population of Suichuan Gougunao Tea Tree

YIN Minghua(), DONG Jiaying, CHEN Liyan, LI Junyan, DENG Yun, HUANG Jia   

  1. College of Life Sciences, Shangrao Normal University, Shangrao, Jiangxi 334001
  • Published:2026-09-25 Online:2026-09-24

摘要:

为了解析遂川狗牯脑茶树本地群体种的完整叶绿体基因组特征,本研究以该茶树为试材,通过DNBSEQ-T7 测序平台获取叶绿体基因组数据,利用生物信息学软件进行序列分析。研究结果表明,遂川狗牯脑茶树本地群体种的叶绿体基因组呈现典型的四分体环状结构,总长度为157099 bp。基因组共注释了135个功能基因,共检测到53个简单重复序列(SSR)位点和48个长重复序列(Long repeat),其核苷酸多态性值(Pi)的变化范围为0~0.01265,密码子的偏好性较弱,识别出14个最优密码子。在选择压力分析中,ndhB基因和rps8基因受到正选择作用,其余基因受到纯化选择。系统发育分析显示,遂川狗牯脑茶树本地群体种与德宏茶(KJ806279)的亲缘关系密切,并与其他种群如汀坪东(PP231879)、六堡茶(OQ281601)约在5.55百万年前开始分化。

关键词: 遂川狗牯脑茶树, 本地群体种, 叶绿体基因组, 序列特征, 密码子偏好性, 系统发育

Abstract:

To analyze the complete chloroplast genome characteristics of the local population of Suichuan Gougunao tea tree, the DNBSEQ-T7 BGI sequencing platform and bioinformatics analysis software were used in this study to analyze the chloroplast genome of the local population of Suichuan Gougunao tea tree. The chloroplast genome of the local population of Suichuan Gougunao tea tree was a typical quadripartite circular structure with a total length of 157099 bp. A total of 135 functional genes were annotated, and 53 simple sequence repeat (SSR) loci and 48 long repeats were detected. The variation range of nucleotide polymorphism (Pi) was 0-0.01265, with weak codon bias. There were a total of 14 optimal codons, with the ndhB gene and rps8 gene undergoing positive selection, while the remaining genes were subject to purifying selection. The local population of Suichuan Gougunao tea tree was closely related to Dehong tea (KJ806279). The divergence time between the local population of Suichuan Gougunao tea tree and Tingpingdong (PP231879) and Liubao tea (OQ281601) was approximately 5.55 million years ago.

Key words: Suichuan Gougunao tea tree, the local population, chloroplast genome, sequence features, codon bias, phylogeny

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