张 喆,张 正,曾永三.昆虫病原线虫Oscheius myriophila 的形态和分子特征[J].广东农业科学,2016,43(7):87-92 |
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昆虫病原线虫Oscheius myriophila 的形态和分子特征 |
Morphological and molecular characteristics of an entomopathogenic nematode,Oscheius myriophila |
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DOI:10.16768/j.issn.1004-874X.2016.07.014 |
中文关键词: 昆虫病原线虫 小杆线虫 Oscheius myriophila 18S rDNA 28S rDNA |
英文关键词: entomopathogenic nematode Rhabditid Oscheius myriophila 18S rDNA 28S rDNA |
基金项目:广东省科技计划项目(2011B020308010) |
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中文摘要: |
2010—2013 年在昆虫病原线虫调查中,从华南农业大学植物园采集土样,利用大蜡螟(Galleria mellonella)诱集,获得1 个小杆类昆虫病原线虫种群(华农种群HN)。该线虫雌虫的形态符合Oscheius myriophila 的原始描述,测量值中除虫体宽度(70~123 vs 57~70 μm)和口腔宽度(5~8 vs <4.5μm)更宽、尾更长(138~188 vs 108~135 μm)外,其余特征值均在该种原始描述的范围内;用HN 种群的18S 和28S rDNA 序列进行Blast 搜寻和比对,结果表明该种群18S 序列与GenBank 中的O. myriophila(AY602176)的相似度高达99%(1512/1514=99%),28S 序列与O. myriophila(U81588)的相似度达100%(609/609=100%)。分子系统发育分析结果显示,HN 与GenBank 中的多个O. myriophila 种群以高置信度聚在相同的Insectivorus 支系。综合形态学和18S 和28S rDNA 序列特征,确定华农种群HN 为Oscheiusmyriophila。 |
英文摘要: |
During the survey of entomopathogenic nematodes from 2010 to 2013, an entomopathogenic nematode population named Huanong( HN) trapped by using Galleria mellonella was isolated from soil samples collected from botanical garden in campus of South China Agricultural University. Morphological
characteristics of the HN population female agreed with the original description of species Oscheius myriophila,
and morphometrics of the population fitted into ranges of the original except for a wider body width( 70-123
vs 57-70 μm) and stomal width( 5-8 vs <4.5 μm), and a longer tail( 138-188 vs 108-135 μm). Blast
and alignment of rDNA sequences of the HN revealed identity of 99%( 1512/1514=99%) with O. myriophila
(AY602176)for 18S and 100%( 609/609=100%) with O. myriophila( U81588)for 28S. Molecular
phylogenetic analysis indicated that the HN and several populations of O. myriophila from GenBank were
clustered into Insectivorus clade with high bootstraps. The HN was identified as Oscheius myriophila based on
morphology and analysis of 18S and 28S rDNA sequences. |
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