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首页> 外文期刊>Plant Pathology >Diaporthe sclerotioides exhibits no host specificity among cucurbit species
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Diaporthe sclerotioides exhibits no host specificity among cucurbit species

机译：硬皮假单胞菌在葫芦科物种中没有宿主特异性

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摘要

Plant-fungal specificity between cucurbitaceous crops and Diaporthe sclerotioides, the causal agent of black root rot, was studied using cucumbers (Cucumis sativa), melons (Cucumis melo), pumpkins (Cucurbita maxima), watermelons (Citrullus lanatus) and bottlegourd (Lagenaria siceraria var. gourda). Twelve D.sclerotioides isolates from these cucurbit species were cross-inoculated. The virulence of the isolates was evaluated as the area under the disease progress curve (AUDPC). All cucurbit species were susceptible to each isolate, but AUDPCs were significantly different among the hosts, with the order of greatest to least being melon, cucumber, watermelon, bottlegourd and finally, pumpkin. The infectiveness of isolates was assessed as the quantity of D.sclerotioides DNA detected in the hypocotyls of seedlings 2weeks after inoculation using a real-time PCR protocol. The fungal DNA quantities varied among the species in the same order as the AUDPCs. Whilst there were statistically significant correlations between the virulence and infectiveness of D.sclerotioides isolates in cucumbers, melons and bottlegourds, their coefficients of determination were not high (r(2)<06). Orthogonal contrasts indicated no specificity in either the fungal virulence or infectiveness between D.sclerotioides isolates and the cucurbit hosts from which these isolates originated. Thus, although the degree of host susceptibility to D.sclerotioides varies among cucurbit species, the absence of specificity to the host species in either virulence or infectiveness suggests the pathogen may spread via various cucurbit crops, irrespective of their original host species.
机译：研究了黄瓜（Cucumis sativa），瓜类（Cucumis melo），南瓜（Cucurbita maxima），西瓜（Citrullus lanatus）和瓶颈（Laariaaria sicerer）对葫芦科作物和硬皮病（Diaporthe sclerotioides）（黑根腐病的病原体）之间的植物真菌特异性。古尔达（var。gourda）。交叉接种了来自这些葫芦科物种的十二种D.sclerotioides分离物。将分离物的毒力评价为疾病进展曲线（AUDPC）下的面积。所有葫芦科物种对每种分离物均易感，但宿主之间的AUDPC差异显着，从大到小的顺序依次为瓜，黄瓜，西瓜、,子，最后是南瓜。使用实时PCR方案，接种2周后，在幼苗的下胚轴中检测到的菌核梭菌DNA量评估了分离株的感染力。真菌DNA的数量在物种之间以与AUDPC相同的顺序变化。虽然黄瓜，甜瓜和bottle的分离菌的毒力和感染力之间在统计学上具有显着的相关性，但它们的测定系数并不高（r（2）<06）。正交对比表明在硬核梭菌分离物和这些分离物起源的葫芦宿主之间，在真菌毒力或感染性方面没有特异性。因此，尽管在葫芦科物种中，寄主对D.sclerotioides的敏感性程度有所不同，但是在毒力或传染性方面对寄主物种的特异性缺乏都表明，病原体可能会通过各种葫芦类作物传播，而不论其原始寄主物种如何。

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