中国水稻科学 ›› 2025, Vol. 39 ›› Issue (6): 801-812.DOI: 10.16819/j.1001-7216.2025.240612

• 研究报告 • 上一篇    下一篇

野生稻叶绿体基因组组装与密码子偏好性分析及系统发育研究

李荣欣1,2, 王波2, 肖素勤2, 殷富有2, 张建红3, 钟巧芳2, 陈玲2, 李金璐2, 杨和生3, 程在全2,*(), 刘丽2,*()   

  1. 1云南大学 资源植物研究院昆明 650504
    2云南省农业科学院 生物技术与种质资源研究所昆明 650205
    3云南省陆良县种子管理站云南 陆良 655699
  • 收稿日期:2024-06-19 修回日期:2024-07-12 出版日期:2025-11-10 发布日期:2025-11-19
  • 通讯作者: * email:czquan-99@163.com;liuliyaas@163.com
  • 基金资助:
    国家重点研发计划资助项目(2021YFD1200102-02);云南省农业联合专项-重点项目(202301BD070001-149);云南省种子种业联合实验室项目(202205AR070001-01);云南省杨庆文专家工作站项目(202305AF150161)

Assembly, Codon Usage Bias, and Phylogenetic Analysis of Chloroplast Genome of Oryza meyeriana

LI Rongxin1,2, WANG Bo2, XIAO Suqin2, YIN Fuyou2, ZHANG Jianhong3, ZHONG Qiaofang2, CHEN Ling2, LI Jinlu2, YANG Hesheng3, CHENG Zaiquan2,*(), LIU Li2,*()   

  1. 1Institute of Plant Resources, Yunnan University, Kunming 650504, China
    2Institute of Biotechnology and Germplasm Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China
    3Seed Management Station of Luliang County, Yunnan Province, Luliang 655699, China
  • Received:2024-06-19 Revised:2024-07-12 Online:2025-11-10 Published:2025-11-19
  • Contact: * email:czquan-99@163.com;liuliyaas@163.com

摘要:

【目的】疣粒野生稻是稻属中唯一的旱生且保存较多原始性状的耐荫野生稻。本研究旨在丰富疣粒野生稻的遗传基础,为疣粒野生稻优异基因的载体构建提供信息参考。【方法】采用二代测序技术对云南疣粒野生稻叶绿体基因组进行测序、组装和注释,进而运用RStudio和MEGA分析其密码子偏好性及系统发育。【结果】疣粒野生稻叶绿体基因组全长135,937 bp,总GC含量39.0%,有效密码子(ENC)平均值为48.09,密码子偏好性较弱;ENC-plot、PR2-plot及中性绘图分析显示选择压力对疣粒野生稻叶绿体基因组密码子偏好性有重要决定作用,且密码子偏好性主要调控自我复制与光合系统相关基因;共鉴定出16个优势密码子,其中14个以A/U结尾,2个以G/C结尾;通过系统发育分析明确了疣粒野生稻叶绿体基因组与短药野生稻的亲缘关系较近。【结论】本研究丰富了疣粒野生稻基因组的基本组成和遗传信息,为水稻优异光合基因挖掘及物种进化研究奠定了基础。

关键词: 云南疣粒野生稻, 叶绿体基因组, 密码子偏好性, 系统发育

Abstract:

【Objective】 Oryza meyeriana, which is shade-tolerant and retains many primitive traits, is the only xerophytic type of wild rice in the genus Oryza. This study aims to enrich the genetic foundation of O. meyeriana and provide reference for vector construction of its superior genes. 【Methods】 The chloroplast genome of Yunnan O. meyeriana was sequenced using second-generation sequencing technology, followed by assembly and annotation. Codon usage bias and phylogenetic relationships were analyzed with RStudio and MEGA. 【Results】 The results showed that the total length of the chloroplast genome was 135,937 bp, with a GC content of 39.0%. The average effective number of codons(ENC) value was 48.09, indicating weak codon usage bias. ENC-plot, PR2-plot, and neutral plot analyses revealed that selection pressure plays a major role in shaping the chloroplast codon usage bias in Oryza meyeriana, and that this bias mainly regulates genes involved in self-replication and the photosynthetic system. A total of 16 optimal codons were identified, among which 14 ended with A/U and 2 ended with G/C. Phylogenetic analysis based on the chloroplast genome showed that Oryza meyeriana is closely related to O. brachyantha.【Conclusion】 This study enriches our understanding of the genomic composition and genetic information of Oryza meyeriana. The findings provide a basis for mining favorable genes related to photosynthesis and for investigating the evolution of wild rice species.

Key words: Yunnan Oryza meyeriana, chloroplast genome, codon usage bias, phylogeny