頁籤選單縮合
題 名 | Evaluation of the Rearrangement of Taxonomic Position of Peronophythora Litchii Based on Partial DNA Sequences=根據部份DNA序列重定Peronophythora Litchii分類的評估 |
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作 者 | 張正光; 鄭小波; 王源超; 柯文雄; | 書刊名 | Botanical Studies |
卷 期 | 48:1 2007.01[民96.01] |
頁 次 | 頁79-89 |
分類號 | 373.9 |
關鍵詞 | 序列相似度; 28S rDNA; ITS rDNA; Peronophythora litchii; Phytophthora; Sequency similarity; |
語 文 | 英文(English) |
中文摘要 | 本文利用卵菌門內組成員,互相之間的ribosomal ITS序列及28S ribosomal DNA序列的相似度,來決定根據近系統關係而建議將Peronophythora litchii移到Phytophthora的正當性。此建議的正當性,全建立在分類階級的高低與此兩DNA片段的相似度成反比的這一假設的正確性。本文所用的材料包括此研究所得的序列及由GenBank所獲得的序列。Phylophthora sojoe同Plasmopara viticola之間的序列相似度,高於Phytophthora屬內不同種之間的序列相似度,也高於Peronospora parasitica種內幾個不同分離株之間的序列相似度。由此可見根據ITS序列的關係來改變分類階級缺乏正當性。Bremia lactucae種內AR246與HV656之間的28S序列相似度低於Peronospora, Phytophthora, Pythium, Albugo及Achlya同屬內有些不同種之間的序列相似度,也低於很多不同屬之間的序列相似度,這些証據都顯示根據28S序列的關係來改變分類階級是沒有正當性的。在分類地位上,Peronophythora當特異的屬,介於Peronospora及Phytophthora之間,而Peronophythoraceae當特異的科,介於Peronosporaceae及Pythiaceae因此保持有效。 |
英文摘要 | Similarity levels of ribosomal ITS sequences and 28S ribosomal DNA sequences among members of the Oomycota were analyzed to determine the validity of the suggestion of transferring Peronophythora litchi to Phytophthora based on their close phylogenetic relationship. The validity of the suggestion is dependent on the accuracy of the accuracy of the assumption of the existence of a negative correlation between the order of the taxonomic ranks and the level of the sequence similarity of these two DNA fragments. Included in this report are sequences obtained in this study and sequences retrieved from the GenBank. Phytophthora sojae and Plasmopara viticola showed a higher level of ITS sequence similarity than all the species pairs of Phytophthora and several isolate pairs of Peronospora parasitics tested, indicating the lack of validity of transferring the taxonomic rank based on the Its sequence relationships. The isolates AR 246 and HV 656 of Bremia lactucae showed a lower level of 28S sequence similarity than some species pairs of the same genus of Penonospora, Phytophthora, Pythium, Albugo and Achlya, and most species pairs of the different genera tested indicated also the lack of validity of transferring the taxonomic rank based on the 28S sequence relationships. The taxonomic statuses of Peronophythora as a distinct genus transitional between Peronospora and Phytophthora and of Peronophythoraceae as a distinct family transitional between Peronosporaceae and Pythiaceae, therefore, remain valid. |
本系統中英文摘要資訊取自各篇刊載內容。