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首页> 外文期刊>Mycologia >Phytophthora rosacearum and P. sansomeana, new species segregated from the Phytophthora megasperma 'complex'
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Phytophthora rosacearum and P. sansomeana, new species segregated from the Phytophthora megasperma 'complex'

机译:蔷薇疫霉(Phytophthora rosacearum)和桑氏假单胞菌(P. sansomeana),是从巨大疫霉(Phytophthora megasperma)“复合体”中分离出来的新物种。

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摘要

Phytophthora megasperma sensu lato was a conglomeration of morphologically similar but phylogenetically unrelated species. In this paper we continue the segregation of species from the old P. megasperma complex, formally naming two previously recognized isolate groups. Isolates recovered from rosaceous fruit trees (especially apple and cherry) are in ITS clade 6, related to but distinct from P. megasperma sensu strictu. They are named here Phytophthora rosacearum. They have been referred to previously as the "AC" or "high temperture small cospore" group of P. megasperma. A second group of isolates, earlier called "soybean race non-classifiable", recovered from soybeans in Indiana and other Midwestern states, are morphoogically similar to P. megasperma sensu strictu but unrelated to that species, failing in ITS clade 8. They are named here P. sansomeana. Isolates recovered from Douglas-fir seedlings in nurseries in the Pacific Northwest and various weedy hosts in New York State, referred to in earlier work as "P. megasperma DFI", appear to be conspecific with the soybean isolates, although they include certain ITS DNA polymorphisms. Both new species are supported by a combination of new and previously published morphological, growth and molecular data.
机译:巨大疫霉(Phytophthora megasperma sensu lato)是形态相似但系统发育上不相关的物种的聚集体。在本文中,我们继续从旧的大型精子虫复合体中分离物种,正式命名两个先前公认的分离群。从蔷薇果树(尤其是苹果和樱桃)中回收的分离物位于ITS进化枝6中,与严格意义上的P. megasperma sensu strictu相关,但与之不同。他们在这里被命名为蔷薇疫霉。它们以前被称为巨型精子孢菌的“ AC”或“高温小孢子”群。从印第安纳州和中西部其他州的大豆中分离出的第二批分离株,以前称为“无法分类的大豆种族”,在形态上类似于严格意义上的P. megasperma sensu,但与该物种无关,失败于ITS进化枝8。在这里P. sansomeana。从西北太平洋地区苗圃的道格拉斯冷杉幼苗和纽约州的各种杂草寄主中分离的菌株,在早期的工作中称为“巨大精子DFI”,尽管它们包含某些ITS DNA,但它们似乎与大豆分离株具有同种性。多态性。这两个新物种都得到了新的和先前发布的形态,生长和分子数据的综合支持。

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