中国农业科学 ›› 2025, Vol. 58 ›› Issue (21): 4361-4371.doi: 10.3864/j.issn.0578-1752.2025.21.006

• 豇豆“两虫一病”绿色防控研究与实践创新 • 上一篇    下一篇

豆大蓟马不同地理种群线粒体CO1的遗传多样性

刘晓旭1,2(), 钟泽鑫1, 邱佳仁1, 杨春晓1, 张永军2, 谢文3, 张友军3, 潘慧鹏1,*()   

  1. 1 华南农业大学植物保护学院/绿色农药全国重点实验室/生物防治教育部工程研究中心,广州 510642
    2 中国农业科学院植物保护研究所/植物病虫害综合治理全国重点实验室,北京 100193
    3 中国农业科学院蔬菜花卉研究所/蔬菜生物育种全国重点实验室,北京 100081
  • 收稿日期:2025-04-24 接受日期:2025-05-27 出版日期:2025-11-01 发布日期:2025-11-06
  • 通信作者:
    潘慧鹏,E-mail:
  • 联系方式: 刘晓旭,E-mail:liuxx9693@163.com。
  • 基金资助:
    国家重点研发计划(2024YFD1400100)

GENETIC DIVERSITY OF MTCO1 IN DIFFERENT GEOGRAPHICAL POPULATIONS OF MEGALUROTHRIPS USITATUS

LIU XiaoXu1,2(), ZHONG ZeXin1, QIU JiaRen1, YANG ChunXiao1, ZHANG YongJun2, XIE Wen3, ZHANG YouJun3, PAN HuiPeng1,*()   

  1. 1 College of Plant Protection, South China Agricultural University/State Key Laboratory of Green Pesticide/Engineering Research Center of Biological Control, Ministry of Education, Guangzhou 510642
    2 Institute of Plant Protection, Chinese Academy of Agricultural Sciences/State Key Laboratory for Biology of Plant Diseases and Insect Pests, Beijing 100193
    3 Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences/State Key Laboratory of Vegetable Biobreeding, Beijing 100081
  • Received:2025-04-24 Accepted:2025-05-27 Published:2025-11-01 Online:2025-11-06

摘要:

【目的】豆大蓟马(Megalurothrips usitatus)是我国重要的蔬菜害虫,对豆类经济作物造成严重危害。本研究旨在比较不同地理种群豆大蓟马遗传多样性,明确其遗传分化现状,为豆大蓟马精准防控提供理论依据。【方法】通过采集广东省内6个地级市、省外9个地级市共18个地理种群豆大蓟马样本,基于聚合酶链式反应(PCR)获得线粒体DNA(mitochondrial DNA,mtDNA)细胞色素c氧化酶亚基1(cytochrome c oxidase subunit 1,CO1)基因序列,分析不同地理种群豆大蓟马的单倍型多样性(Hd)、核苷酸多样性(π)并进行Tajima’s D中性检验,评估种群遗传结构;计算种群间分化指数(FST)和基因流(Nm),分析不同地理种群间的遗传分化程度。【结果】在18个地理种群豆大蓟马样本中检测得到111条mtCO1基因序列,共检测到617个保守位点及24个变异位点,变异位点占序列总长的3.68%。检测到单倍型(haplotype,H)共20种(H1—H20),其中H4为优势单倍型,占序列总数的48.6%,分布于17个种群。豆大蓟马单倍型多样性(Hd=0.677)和核苷酸多样性(π=0.00425)较高,但不同遗传类型之间的核苷酸序列差异不明显;Tajima’s D中性检验不显著,表明群体大小保持稳定,未发生明显扩张。此外,种群间分化指数(FST=0.04973<0.05)和基因流(Nm=9.55>1)分析表明,不同地理种群间基因交流充分,遗传分化程度低。分子方差分析结果表明,引起种群总体变异的主要因素为种群内变异。【结论】不同地理种群豆大蓟马遗传多样性较高,地理种群之间的基因交流频繁,遗传分化较小,总群体大小保持相对稳定状态。研究结果可为不同地区的豆大蓟马田间种群综合防治提供理论依据。

关键词: 豆大蓟马, 地理种群, 线粒体CO1基因, 遗传多样性, 遗传分化

Abstract:

【Objective】Megalurothrips usitatus is a significant vegetable pest in China, causing substantial damage to legume crops as economic plants. The purpose of this study is to compare the genetic diversity of M. usitatus in different geographical populations and ascertain the genetic differentiation of M. usitatus, and to provide a theoretical basis for the precise control of M. usitatus. 【Method】A total of 18 geographical populations of M. usitatus were collected from 6 prefecture-level cities in Guangdong Province and 9 prefecture-level cities outside Guangdong Province. The mitochondrial DNA (mtDNA) cytochrome c oxidase subunit 1 (CO1) gene sequence was obtained based on PCR. The haplotype diversity (Hd), nucleotide diversity (π) of different geographical populations were analyzed, and Tajima’s D neutrality test based on the mtCO1 was performed to evaluate the genetic structure of M. usitatus populations across different geographical regions. The fixation index (FST) and gene flow (Nm) were calculated to evaluate the degree of genetic differentiation among populations. 【Result】A total of 111 mtCO1 gene sequences were detected in 18 geographical populations of M. usitatus. A total of 617 conserved sites and 24 variable sites were detected, accounting for 3.68% of the total sequence length. A total of 20 haplotypes (H1-H20) were detected, of which H4 was the dominant haplotype, accounting for 48.6% of the total sequence and distributed in 17 populations. The overall population of M. usitatus exhibited relatively high haplotype diversity (Hd=0.677) and nucleotide diversity (π=0.00425), but nucleotide sequence divergence among different genetic types was not pronounced. The nonsignificant Tajima’s D neutrality test indicated stable population size without marked expansion. Furthermore, the population fixation coefficient (FST=0.04973<0.05) and gene flow (Nm=9.55>1) suggested sufficient genetic exchange and low genetic differentiation among geographically distinct populations. The results of molecular variance analysis showed that the main factor causing the overall population variation was intra-population variation. 【Conclusion】The geographically distinct populations of M. usitatus exhibited relatively high genetic diversity, with frequent gene flow and minimal genetic differentiation among populations, suggesting a stable overall population size. These findings provide a theoretical basis for the integrated management of M. usitatus field populations in diverse regions.

Key words: Megalurothrips usitatus, geographical population, mtCO1, genetic diversity, genetic differentiation