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首页> 外文期刊>Plant Pathology >Evidence for the occurrence of natural hybridization in reed-associated Pythium species
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Evidence for the occurrence of natural hybridization in reed-associated Pythium species

机译：与芦苇相关的腐霉属物种发生自然杂交的证据

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摘要

A comparison of oomycete diversity in reed stands (Phragmites australis) of Lake Constance, Germany, and maize fields close by provided evidence for the occurrence of natural hybridization between Pythium phragmitis, a newly described reed pathogen, and an as-yet unknown Pythium species closely related to P. phragmitis and P. arrhenomanes. Internal transcribed spacer and β-tubulin sequences of a large set of Pythium isolates from reeds showed dimorphic signals at several positions, indicative of a mixture of characters of two parent species. Involvement of P. phragmitis in the putative hybrid species was confirmed after cloning and sequencing of ITS regions and β-tubulin genes of the hybrid isolates. Mitochondrially inherited coxll gene sequences did not show dimorphic sites and suggested that the hybridization event was relatively ancient, or that other species might be involved. Intermediate habitat preferences, morphological characters and aggressiveness towards reeds and other grasses confirmed the suggestion that these isolates comprise a natural hybrid between two Pythium species. Pythium arrhenomanes, likely to be involved in the putative hybrid's evolution, was repeatedly isolated from maize fields adjacent to P. phragmitis-iniested reed stands. The interface between natural habitats with established oomycete communities and agricultural fields with potentially introduced pathogens might constitute an evolutionary hot-spot giving rise to new species with as-yet unknown host ranges. As indicated by inoculation tests, the hybrid was significantly more pathogenic towards reed rhizomes than P. phragmitis, which caused no damage to these organs. This is apparently the first report of the occurrence of natural hybridization in Pythium.
机译：比较德国康斯坦茨湖芦苇林（Phragmites australis）和附近玉米田中卵菌的多样性，为新近描述的芦苇病原体腐霉菌皮炎和迄今未知的腐霉菌种之间发生自然杂交提供了证据。与体育性睑板炎和阿雷诺曼氏菌有关。大量来自芦苇的腐霉分离物的内部转录间隔区和β-微管蛋白序列在几个位置显示双态信号，表明两种亲本物种的特征混合。在克隆分离株的ITS区域和β-微管蛋白基因并对其进行测序后，证实了假单胞菌参与了杂种。线粒体遗传的coxll基因序列没有显示双态位点，表明杂交事件相对较古老，或者可能涉及其他物种。中间生境偏好，形态特征和对芦苇和其他草的侵略性证实了以下建议：这些分离物包含两个腐霉属之间的天然杂种。可能与推定杂种的进化有关的腐霉腐霉（Pythium Arrhenomanes）是从与芦苇（P. phragmitis）为媒介的芦苇林相邻的玉米田中反复分离的。建立了卵菌群落的自然栖息地与可能引入病原体的农田之间的界面可能构成了一个进化热点，从而产生了迄今未知寄主范围的新物种。如接种测试所示，杂种对芦苇根茎的致病性比芦苇（P. phragmitis）好，这对这些器官没有损害。这显然是关于腐霉中自然杂交发生的第一个报道。

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