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首页> 外文期刊>Mycologia >Phytophthora siskiyouensis, a new species from soil, water, myrtlewood (Umbellularia californica) and tanoak (Lithocarpus densiflorus) in southwestern Oregon
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Phytophthora siskiyouensis, a new species from soil, water, myrtlewood (Umbellularia californica) and tanoak (Lithocarpus densiflorus) in southwestern Oregon

机译：疫霉菌（Phytophthora siskiyouensis），是一种来自俄勒冈州西南部的土壤，水，桃金娘（Umbellularia californica）和taanok（Lithocarpus densiflorus）的新物种

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摘要

An unknown Phytophthora species was recovered in southwestern Oregon from rhododendron and tanoak leaf baits used for monitoring streams and soils for the presence of Phytophthora ramorum, from a blighted shoot of myrtlewood and from tanoak bark cankers. Isolates of this species yielded ITS-DNA sequences that differed substantially from other Phytophthora sequences in GenBank. Morphological features also differed from available descriptions of known Phytophthora species. Based on the combination of unique morphology and unique ITS sequences a new species is proposed. The new species, Phytophthora siskiyouensis, is homothallic with globose to subglobose oogonia, which may be terminal, sessile or laterally intercalary. Antheridia are capitate and mostly paragynous but sometimes amphigynous. Oospores are mostly aplerotic. Sporangia are variable but commonly ovoid to reniform, with apical, subapical or lateral semipapillae (occasionally more than one). Sporangia are terminal, subterminal or occasionally intercalary on unbranched sporangiophores, with basal, subbasal or lateral attachment. Sporangia are weakly deciduous, with variable length pedicels. This combination of characters clearly separates Phytophthora siskiyouensis from other known Phytophthora species.
机译：在俄勒冈州西南部，从杜鹃花和tanoak叶诱饵中发现了未知的疫霉菌种，用于监测溪流和土壤中是否存在疫霉菌，桃金娘病的枯枝芽和tanoak树皮溃疡病。该物种的分离物产生的ITS-DNA序列与GenBank中其他疫霉菌的序列有很大的不同。形态特征也不同于已知疫霉菌种的可用描述。基于独特的形态和独特的ITS序列的组合，提出了一个新物种。新种，Phytophthora siskiyouensis，是同球形的，球形的到近球形的卵形，可能是末端，无柄或侧生。头晕是头状的，多数是旁生的，有时是两性的。孢子多数是无毛的。孢子囊是可变的，但通常为卵形，顶端，近尖或外侧半乳头（有时不等）。孢子囊是终末的，近终的或偶尔在无分支的孢子囊中的inter间，具基部，近基部或侧向附着。孢子囊为弱落叶性，花梗长度可变。字符的这种组合清楚地将疫霉菌与其他已知疫霉菌分开。

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