Genetic groups of the insect-pathogenic fungus Beauveria bassiana are associated with habitat and thermal growth preferences
Genetic groups of the insect-pathogenic fungus Beauveria bassiana are associated with habitat and thermal growth preferences
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DOI：
10.1007/s00203-002-0490-7
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发表时间：
2002-12-01
影响因子：
2.8
通讯作者：
Kamp, AM
中科院分区：
文献类型：
--
作者：
Bidochka, MJ;Menzies, FV;Kamp, AM
昆虫病理学中的一个持久范例是将昆虫宿主与昆虫病原真菌的某些遗传群体联系起来。这种模式假设昆虫病原真菌的基因型与它感染的昆虫宿主的某个分类群共同进化。昆虫病原真菌球孢白僵菌具有广泛的寄主范围，被认为是兼性昆虫病原菌。本研究对B.来自森林和农业栖息地以及来自加拿大北极地区的球孢白僵菌显示出与三种不同栖息地相关的不同遗传群体。在每个组内，重组人口结构和克隆繁殖的血统进行了观察。B。还评估了球孢分离物在8、15、25和37 ℃下生长的能力以及它们对UV暴露的耐受性。来自北极和森林栖息地的基因组在较低的温度下生长，而来自农业栖息地的基因组在37摄氏度下生长，并能耐受紫外线照射。基因组与感染鞘翅目或鳞翅目昆虫幼虫的能力之间没有明显的关联。越来越多的证据表明，这些研究代表了一个重大的范式转变;生境选择，而不是昆虫宿主选择，驱动着半知菌属昆虫病原真菌的种群结构。我们认为，适应一定的栖息地类型是一个重要的标准，确定用于昆虫生物防治工作的病原真菌菌株。
A persistent paradigm in insect pathology is one that relates the insect host to certain genetic groups of insect-pathogenic fungi. This paradigm assumes that the genotype of an insect-pathogenic fungus coevolves with a certain taxon of insect host that it infects. The insect-pathogenic fungus Beauveria bassiana shows a wide host range and is considered to be a facultative insect pathogen. In this study, a population genetics analysis of B. bassiana from forested and agricultural habitats as well as from the Canadian Arctic showed distinct genetic groups associated with the three different habitats. Within each group, recombining population structures and clonally reproducing lineages were observed. The B. bassiana isolates were also assessed for their abilities to grow at 8, 15, 25 and 37 degreesC and for their tolerances to UV exposure. The genetic groups from the Arctic and from the forested habitats grew at lower temperatures, while the genetic group from the agricultural habitat grew at 37 degreesC and was tolerant to UV exposure. There were no clear associations between the genetic group and the ability to infect coleopteran or lepidopteran insect larvae. There is increasing evidence that such studies represent a significant paradigm shift; habitat selection, not insect host selection, drives the population structure of deuteromycetous insect-pathogenic fungi. We suggest that adaptation to a certain habitat type is an important criterion for identifying insect-pathogenic fungal strains for use in insect biocontrol efforts.