Journal of Integrative Agriculture ›› 2014, Vol. 13 ›› Issue (12): 2701-2708.DOI: 10.1016/S2095-3119(14)60749-8

• 论文 • 上一篇    下一篇

Influence of Host Shift on Genetic Differentiation of the Oriental Fruit Fly, Bactrocera dorsalis

 WAN Xuan-wu, LIU Ying-hong, LUO Lin-ming, FENG Chuan-hong, WANG Sheng , MA Li   

  1. 1、College of Plant Protection, Southwest University/Chongqing Key Laboratory of Entomology and Pest Control Engineering, Chongqing
    400716, P.R.China
    2、Sichuan Plant Protection Station, Chengdu 610041, P.R.China
  • 收稿日期:2013-09-05 出版日期:2014-12-01 发布日期:2014-12-10
  • 通讯作者: LIU Ying-hong, Tel: +86-23-68251795, E-mail: yhliu@swu.edu.cn
  • 作者简介:WAN Xuan-wu, Mobile: 18615712715, E-mail: goodmorning85@163.com
  • 基金资助:

    This study was supported by the National Basic Research Program of China (2009CB125903) and the Innovation Fund for graduate student in Southwest University of China (kb2011014).

Influence of Host Shift on Genetic Differentiation of the Oriental Fruit Fly, Bactrocera dorsalis

 WAN Xuan-wu, LIU Ying-hong, LUO Lin-ming, FENG Chuan-hong, WANG Sheng , MA Li   

  1. 1、College of Plant Protection, Southwest University/Chongqing Key Laboratory of Entomology and Pest Control Engineering, Chongqing
    400716, P.R.China
    2、Sichuan Plant Protection Station, Chengdu 610041, P.R.China
  • Received:2013-09-05 Online:2014-12-01 Published:2014-12-10
  • Contact: LIU Ying-hong, Tel: +86-23-68251795, E-mail: yhliu@swu.edu.cn
  • About author:WAN Xuan-wu, Mobile: 18615712715, E-mail: goodmorning85@163.com
  • Supported by:

    This study was supported by the National Basic Research Program of China (2009CB125903) and the Innovation Fund for graduate student in Southwest University of China (kb2011014).

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摘要： Invasion of the oriental fruit fly, Bactrocera dorsalis, into new niches containing different food sources (a process referred to as host shift), may cause population genetic differentiation and sympatric speciation. To attempt to infer that experimentally, test populations were established by transferring a subset of the original populations, which had been grown on banana for many generations, onto navel orange, and then subculturing the navel orange population and banana population for at least 20 generations. Four pairs of SSR primers with high polymorphism on laboratory strains were used to detect population genetic differentiation. All six tested populations (the 5th, 10th and 15th generations of B. dorsalis fed on banana and navel orange, respectively) were found to have low genetic diversity. Furthermore, the genetic diversity of the navel orange populations was found to decline after being crossed for several generations. Populations initially were deviated from Hardy-Weinberg equilibrium, however, equilibrium was achieved with increasing numbers of generations in both of the host populations. Limited gene flows were found among the six populations. The Nei’s standard genetic distances between the two host populations of the same generation were initially low, but increased with generation number. Genetic distances between banana and navel orange populations of the same generation were lower than genetic distances between different generations grown on the same host plant. Analysis of molecular distance (AMOVA) results based on generation groups and host groups demonstrated that genetic variation among generations was greater than that between the two host populations. The results indicated that population genetic differentiation occurred after the host shift, albeit at low level. Biogeography and taxonomy of the B. dorsalis complex revealed that speciation of B. dorsalis might be tightly associated with host shift or host specialization of B. dorsalis following dispersal.

关键词: Bactrocera dorsalis , oriental fruit fly , host shift , population genetic differentiation , sympatric speciation

Abstract: Invasion of the oriental fruit fly, Bactrocera dorsalis, into new niches containing different food sources (a process referred to as host shift), may cause population genetic differentiation and sympatric speciation. To attempt to infer that experimentally, test populations were established by transferring a subset of the original populations, which had been grown on banana for many generations, onto navel orange, and then subculturing the navel orange population and banana population for at least 20 generations. Four pairs of SSR primers with high polymorphism on laboratory strains were used to detect population genetic differentiation. All six tested populations (the 5th, 10th and 15th generations of B. dorsalis fed on banana and navel orange, respectively) were found to have low genetic diversity. Furthermore, the genetic diversity of the navel orange populations was found to decline after being crossed for several generations. Populations initially were deviated from Hardy-Weinberg equilibrium, however, equilibrium was achieved with increasing numbers of generations in both of the host populations. Limited gene flows were found among the six populations. The Nei’s standard genetic distances between the two host populations of the same generation were initially low, but increased with generation number. Genetic distances between banana and navel orange populations of the same generation were lower than genetic distances between different generations grown on the same host plant. Analysis of molecular distance (AMOVA) results based on generation groups and host groups demonstrated that genetic variation among generations was greater than that between the two host populations. The results indicated that population genetic differentiation occurred after the host shift, albeit at low level. Biogeography and taxonomy of the B. dorsalis complex revealed that speciation of B. dorsalis might be tightly associated with host shift or host specialization of B. dorsalis following dispersal.

Key words: Bactrocera dorsalis , oriental fruit fly , host shift , population genetic differentiation , sympatric speciation