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台灣地區根腐線蟲新記錄種Pratylenchus zeae (Nematoda: Tylenchoidea, Pratylenchidae)之鑑定

Identification of a New Recorded root-lesion Nematode Pratylenchus zeae (Nematoda: Tylenchoidea, Pratylenchidae) from Corn Plantations in Taiwan

摘要


自2007年10月起,從台灣3個鄉鎮玉米田的根圈土壤中,分離並鑑定出3個種群Pratylenchus zeae Graham, 1951,而此一根腐線蟲爲台灣地區的新記錄種。各根腐線蟲種群之主要鑑定依據爲光學顯微鏡和SEM的形態特徵觀察,以及形態測量值(morphometrics)的統計分析,並輔以完整5.85基因和內轉錄區間ITS-1和ITS-2,以及部分18S和28S基因序列的核糖體DNA(ribosomal DNA, rDNA)片段序列的相似度比對分析。在GenBank資料庫中,本研究首次登錄P. zeae的rDNA片段代表性序列,大小爲967bP,其中ITS-1、ITS-2和5.85的序列大小依序分別爲321bP、192bp及157bp。

並列摘要


Three populations of Pratylenchus sp. were isolated by modified Baermann funnel method from the rhizosphere soil which was sampled at three different corn plantations in Taiwan since October, 2007. According to the data of the morphology, morphometrics and ribosomal DNA fragment sequences (including full 5.8S gene, ITS-1, ITS-2 and partial 18S and 28S gene), the 3 populations of nematode was identified as P. zeae Graham, 1951. This discovery was the first report in Taiwan. The representative sequence of rDNA fragment of P. zeae was submitted firstly to GenBank. The length of rDNA fragment was 967 bp included 321 bp for ITS-1, 192 bp for ITS-2 and 157 bp for 5.8S.

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