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首页> 外文期刊>Plant Pathology >A new stem nematode associated with peanut pod rot in China: morphological and molecular characterization of Ditylenchus arachis n. sp. (Nematoda: Anguinidae)
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A new stem nematode associated with peanut pod rot in China: morphological and molecular characterization of Ditylenchus arachis n. sp. (Nematoda: Anguinidae)

机译：中国花生荚腐病的一种新茎线虫：花生Ditylenchus ara的形态和分子特征。 sp。 （线虫：An科）

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摘要

Surveys conducted in peanut production areas of China revealed peanut pod rot in several fields in Shandong and Hebei Provinces, China. A large quantity of an unknown stem nematode was isolated from the hulls and seeds of peanuts, herein described as Ditylenchus arachis n. sp. The new species is characterized by a combination of the following features: lateral lip sectors distinctly projected, stylet delicate, 8.4-10 μm in length, six lines in the lateral field, tail elongate-conoid, bursa covering about 68-86% of tail length. Pathogenicity tests showed that D. arachis n. sp. could infect peanut (Arachis hypogaea), but not sweet potato (Ipomoea batatas) or potato (Solatium tuberosum). Morphologically, D. arachis n. sp. appears closest to D. africanus, D. myceliophagus and D. destructor, but can be differentiated based upon a combination of morphological characteristics, host preference and molecular sequence data. The results of the phylogenetic analysis, based on 18S rDNA, the D2-D3 expansion region of 28S rDNA, and the ITS1-5·8S-ITS2 region, confirmed its status as a new species. A sister relationship with D. destructor was appointed, rather than with its ecologically very similar congener D. africanus.
机译：在中国花生产区进行的调查显示，在中国山东和河北省的几个田地都有花生荚腐病。从花生的壳和种子中分离出大量未知的茎线虫，本文将其描述为花生Ditylenchus arachis。 sp。新物种的特征是具有以下特征的组合：侧唇扇形突出，细密的探针，长度8.4-10μm，侧场有六条线，尾巴呈细长圆锥形，囊囊覆盖了尾巴的约68-86％长度。致病性试验表明，花生D． sp。可以感染花生（Arachis hypogaea），但不能感染红薯（Ipomoea batatas）或马铃薯（Solateium tuberosum）。从形态上讲，D。arachis n。 sp。似乎最接近非洲象皮球菌，菌丝体盘菌和破坏者，但可以根据形态特征，宿主偏好和分子序列数据的组合加以区分。基于18S rDNA，28S rDNA的D2-D3扩展区和ITS1-5·8S-ITS2区的系统发育分析结果证实了其为新物种的地位。任命了与D. destructor的姐妹关系，而不是与其在生态学上非常相似的同类D. africanus。

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