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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Phytophthora alni ： ウィキペディア英語版 Phytophthora alni ''Phytophthora alni'' is an oomycete plant pathogen that causes lethal root and collar rot in alders. It is widespread across Europe and has recently been found in North America. This species is believed to have originated relatively recently. ==Classification== ''P. alni'' was discovered in 1993 in Southern Britain. It has subsequently been reported in many European countries including the Netherlands, Germany, France, Sweden, Belgium, Austria and Hungary〔(【引用サイトリンク】 Distribution of ''P. alni'' - UK Forestry Commission )〕 and has recently been found in Alaska. ''P. alni'' consists of three subspecies, the most commonly isolated and most virulent subspecies ''P. alni alni'' (also referred to as the 'standard form') and two less commonly isolated subspecies ''P. alni uniformis'' (also called the Swedish variant) and ''P.alni multiformis'' (which contains the Dutch, German and UK variants).〔 A recent genetic analysis has suggested that ''P. alni alni.'' was generated on many separate occasions by the hybridization of either ''P. alni uniformis'' with ''P. alni multiformis'' or their ancestors. The same analysis suggests that ''P. alni uniformis'' may have ''P. cambivora'' as an ancestor. ''P. alni multiformis'' may have been generated by autopolyploidization (the spontaneous duplication of chromosome number within a species) or by a hybridisation of two unknown species a long time ago in evolutionary terms (ancient reticulation).〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Phytophthora alni」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.