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首页> 外文期刊>Mycologia >Phytophthora terminalis sp nov and Phytophthora occultans sp nov., two invasive pathogens of ornamental plants in Europe
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Phytophthora terminalis sp nov and Phytophthora occultans sp nov., two invasive pathogens of ornamental plants in Europe

机译：终端疫霉（Phytophthora terminalis sp nov）和隐疫疫霉（Phytophthora occultans sp nov。），是欧洲观赏植物的两种入侵病原体

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In the past decade several Phytophthora strains were isolated from diseased Pachysandra terminalis plants suffering stem base and root rot, originating from the Netherlands and Belgium. All isolates were homothallic and had a felt-like colony pattern, produced semi-papillate sporangia, globose oogonia and had a maximum growth at similar to 27 C. Several additional Phytophthora strains were isolated from diseased Buxus sempervirens plants, originating from the Netherlands and Belgium, which had sustained stem base and root rot; similar strains also were isolated from Acer palmatum, Choisya ternata and Taxus in the United Kingdom. All isolates were homothallic and had a stellate colony pattern, produced larger semi-papillate sporangia and smaller globose oogonia than the isolates from Pa. terminalis and had a maximum growth temperature of similar to 30 C. Phylogenetic analyses of both species using the internal transcribed spacer region of the nuc rDNA (ITS), mt cytochrome oxidases subunit I gene (CoxI) and nuc translation elongation factor 1-alpha gene (TEF1 alpha) revealed that all sequences of each species were identical at each locus and unique to that species, forming two distinct clusters in subclade 2a. Sequence analysis of partial beta-tubulin genes showed that both taxa share an identical sequence that is identical to that of Ph. himalsilva, a species originating from Asia, suggesting a common Asian origin. Pathogenicity trials demonstrated disease symptoms on their respective hosts, and re-isolation and re-identification of the inoculated pathogens confirmed Koch's postulates.
机译：在过去的十年中，从荷兰和比利时的遭受茎基和根腐病的患病Pachysandra terminalis植物中分离出了数种疫霉菌菌株。所有分离株均为同型，具有毡状菌落模式，产生半上孢子状孢子囊，球状卵菌，并在接近27 C的条件下具有最大的生长。从荷兰和比利时患病的短生黄连植物中分离出数种疫霉菌。 ，具有持续的茎基和根腐病;相似的菌株也从英国的棕榈树，Choisya ternata和Taxus中分离出来。所有分离物都是同型的，具有星状菌落模式，比来自终生Pa.terminalis的分离物产生更大的半幼虫孢子囊和较小的球形卵卵菌，并且最高生长温度类似于30C。使用内部转录间隔子对这两个物种进行系统发育分析nuc rDNA（ITS）区域，mt细胞色素氧化酶亚基I基因（CoxI）和nuc翻译延伸因子1-alpha基因（TEF1 alpha）显示，每个物种的所有序列在每个位点都是相同的，并且对该物种是唯一的，形成子小节2a中有两个不同的集群。部分β-微管蛋白基因的序列分析表明，两个分类单元都具有与来自亚洲的物种喜马拉雅木（Ph。himalsilva）相同的相同序列，这暗示了亚洲的共同起源。致病性试验证明了它们各自宿主上的疾病症状，对接种病原体的重新分离和重新鉴定证实了科赫的假设。

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