• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Plant-fungus-beetle interactions: Case studies in Hawaiian endemic Xyleborus species and the black twig borer.
【24h】

Plant-fungus-beetle interactions: Case studies in Hawaiian endemic Xyleborus species and the black twig borer.

机译：植物-真菌-甲虫相互作用：夏威夷地方性木霉属物种和黑树枝bore虫的案例研究。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This dissertation is a contribution towards understanding the evolution of host plant specialization in ambrosia beetles and the role their fungal symbionts play. Two main research questions I addressed are (1) whether diversification of ambrosia beetles is linked to host plant specialization, and (2) whether fungal symbionts enable the beetles to colonize different host plants. Hawaiian endemic Xyleborus species and the black twig borer ( Xylosandrus compactus) were used to investigate these questions.;Molecular phylogenies of Hawaiian endemic Xyleborus ambrosia beetles were used to investigate the association between host plant specialization and their diversification. Mitochondrial (CO1) and nuclear (EF1-alpha) genes were sequenced and used for phylogenetic inference. The results showed that the Hawaiian Xyleborus species are not monophyletic and are composed of at least two separate clades. Among the 13 species sampled, host plant specialization was generally associated with diversification. However, allopatric speciation after dispersal to neighboring islands was observed in the Araliaceae specialist clade and populations.;The Xylosandus compactus-Fusarium solani symbiotic system was used to investigate the role that ambrosia fungus plays in determining host plant use pattern for a generalist ambrosia beetle. Genetic variation and population structure of F. solani in a local population was first investigated using RAPD markers. The results showed a high level of genetic diversity and population structure. However, the cause of population structure cannot be attributed to either the pigmentation phenotypes in the fungus or the host plants.;Two experiments were carried out to test host plant preferences of X. compactus and growth performance of F. solani, in order to understand the observed variation in attack density and colonization success on different host plants. Host plant preference by X. compactus was observed. However, the preference did not correspond to colonization success by the beetle. Measurements of fungal growth rates on nine different host plants indicated than better fungal growth generally translates to higher beetle success. However, exceptions were observed, and twig structure seemed to play a role in determining colonization success of the beetles.
机译：论文为理解寄主甲虫宿主植物的专业化发展及其真菌共生体的作用做出了贡献。我要解决的两个主要研究问题是：（1）佳肴甲虫的多样化是否与宿主植物的专业化有关；（2）真菌共生体是否使甲虫能够在不同的宿主植物上定居。夏威夷特有的木霉属物种和黑枝bore虫（Xylosandrus compactus）被用来研究这些问题。夏威夷特有的木霉菌属甲虫的分子系统发育研究宿主植物的专业化及其多样性之间的联系。线粒体（CO1）和核（EF1-alpha）基因进行了测序，并用于系统发育推断。结果表明，夏威夷木耳科物种不是单系的，并且至少由两个独立的进化枝组成。在抽样的13个物种中，寄主植物的专业化通常与多样化有关。然而，在金丝雀科的专业进化枝和种群中观察到了散布到邻近岛屿后的异源物种形成。紧密结合木霉-茄镰孢的共生系统被用来研究香菇真菌在确定通配香菜甲虫的宿主植物使用模式中的作用。首先使用RAPD标记研究了当地茄茄中F. solani的遗传变异和种群结构。结果显示出较高的遗传多样性和种群结构。然而，种群结构的原因不能归因于真菌或寄主植物中的色素沉着表型。进行了两个实验，以测试紧凑型X.compactus和寄主F.solani的生长性能，以了解在不同寄主植物上观察到的攻击密度和定植成功的变化。观察到紧密连孢杆菌对寄主植物的偏好。但是，该偏好并不对应于甲虫的定殖成功。对九种不同寄主植物上真菌生长速率的测量表明，真菌生长好于一般意味着甲虫成功率更高。然而，观察到例外，并且树枝结构似乎在确定甲虫定植成功中起作用。

著录项

  • 作者

    Kuo, Huang-Chi.;

  • 作者单位

    University of Hawai'i at Manoa.;

  • 授予单位 University of Hawai'i at Manoa.;
  • 学科 Biology Biostatistics.;Biology Ecology.;Biology Entomology.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 122 p.
  • 总页数 122
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号