Journal
EUROPEAN JOURNAL OF PLANT PATHOLOGY
Volume 134, Issue 3, Pages 561-597Publisher
SPRINGER
DOI: 10.1007/s10658-012-0039-9
Keywords
Bayesian inference; Cryptic species; Cytochrome c oxidase subunit 1 (COI); Dagger nematodes; Maximum likelihood; rDNA; New geographic record; Virus vector
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Funding
- 'Ministerio de Ciencia e Innovacion' of Spain [AGL2009-06955]
- 'Consejeria de Economia, Innvovacion y Ciencia' from Junta de Andalucia [AGR-136]
- European Social Fund
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During nematode surveys in southern Spain and Italy 14 populations of Xiphinema species tentatively identified as Xiphinema americanum-group were detected. Morphological and morphometrical studies identified three new species and six known Xiphinema americanum-group species, viz.: Xiphinema parabrevicolle n. sp., Xiphinema parapachydermum n. sp., Xiphinema paratenuicutis n. sp., Xiphinema duriense, Xiphinema incertum, Xiphinema opisthohysterum, Xiphinema pachtaicum, Xiphinema rivesi, and Xiphinema santos. The Xiphinema americanum-group is the most difficult Xiphinema species group for diagnosis since the morphology is very conservative and morphometric characters often overlap. This group includes vectors of several important plant pathogenic viruses that cause significant damage to a wide range of agricultural crops. Molecular characterisation of these species using D2-D3 expansion regions of 28S rRNA, 18S rRNA, ITS1-rRNA and the protein-coding mitochondrial gene, cytochrome oxidase c subunit 1 was carried out and maximum likelihood and Bayesian inference analysis were used to reconstruct phylogenetic relationships among these species and with other Xiphinema americanum-group species.
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