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Please use this identifier to cite or link to this item: https://scholars.tari.gov.tw/handle/123456789/3932
Title: Differentiation of the Xiphinema americanum-group nematodes X. brevicollum, X. incognitum, X. diffusum and X. oxycaudatum in Taiwan by morphometrics and nuclear ribosomal DNA sequences
Authors: Chen, Diann-Yih
Hui-Fang Ni 
Yen, Jyh-Herng
Cheng, Yung-Hsiung
Tsay, Tung-Tsuan
Keywords: identification;Xiphinema americanum-group;ribosomal DNA;internal transcribed spacer;interspecific variation;intraspecific variation;juvenile stages;morphometrics
Issue Date: Jul-2005
Publisher: Brill
Journal Volume: 7
Journal Issue: 5
Start page/Pages: 713-725
Source: Nematology 
Abstract: 
Morphometrics and molecular variability of the X. americanum-group collected in Taiwan were studied. Morphometric data, derived from the females and their developing juveniles, revealed that the 27 populations comprised four taxa: X. brevicollum, X. incognitum, X. diffusum and X. oxycaudatum, the last species being found to have only three juvenile stages. Further identifications were conducted by analysing the nucleotide sequences of the first internal transcribed spacer (ITS-1), 5.8S gene and second internal transcribed spacer (ITS-2) of ribosomal DNA (rDNA). Pairwise comparisons revealed the sequence differences among these taxa ranging from 3.5 to 21.8% for the ITS-1, 2.9 to 28.6% for the ITS-2 and 0 to 3.1% for the 5.8S. Little or no intraspecific variation was detected in the four species for which multiple populations from different geographical regions or hosts were sequenced. Although X. incognitum is morphometrically closer to X. diffusum than it is to X. brevicollum in mean body length, total stylet length, and percentage position of vulva, there is a higher degree of genetic similarity between X. incognitum and X. brevicollum.
URI: https://scholars.tari.gov.tw/handle/123456789/3932
https://brill.com/view/journals/nemy/7/5/article-p713_8.xml
ISSN: 1388-5545
DOI: 10.1163/156854105775142937
Appears in Collections:SCI期刊

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