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Description of Pratylenchus hispaniensis n. sp. from Spain and considerations on the phylogenetic relationship among selected genera in the ...

Description of Pratylenchus hispaniensis n. sp. from Spain and considerations on the phylogenetic... AbstractA new amphimictic species, Pratylenchus hispaniensis n. sp., parasitising theroots of gum cistus in Andújar (Jaén), southern Spain, is described. The newspecies is characterised by the presence of numerous males and by the femalehaving a lip region with three annuli, a divided face, a robust stylet(14.5-17.0 μm) with rounded knobs, lateral fields with four lines, V =80-84, a round spermatheca full of sperm, well developed post-vulval uterinesac and an obliquely truncate tail with irregularly annulated terminus.Morphologically this species is related to P. bhatti, P. kralli, P.mediterraneus, P. pseudofallax and P. thornei. A phenetic study of the 25most useful diagnostic morphological and allometric characters forPratylenchus species was done using multivariate factor and lineardiscriminant analyses. In the factor analysis the first seven factorsaccounted for 71.1% of the total variance of the characters selected. Thesefactors were related to female tail, pharyngeal overlap, reproductivebehaviour, stylet length, L/post-vulval uterine sac ratio, body length andnumber of lip annuli. Discriminant analysis differentiated Pratylenchus spp.from the three valid species of Zygotylenchus. The results of thephylogenetic analysis based on sequences of the D2-D3 expansion regions of28S, partial 18S and ITS rRNA genes confirmed the close relationship of P.hispaniensis n. sp. with P. mediterraneus and inferred molecular affinitywith P. brzeskii, P. neglectus and P. thornei, in spite of variation in theposition of P. hispaniensis n. sp. in the clades. Additional phylogeneticanalyses based on the same sets of sequences for P. hispaniensis n. sp.,Zygotylenchus guevarai and other Pratylenchidae indicated that Pratylenchusincludes several paraphyletic lineages; however, likelihood tests did notreject monophyly of the genus. The inclusion of Pratylenchus, Zygotylenchus,Hirschmanniella, Nacobbus and Apratylenchus in Pratylenchidae wassupported. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematology Brill

Description of Pratylenchus hispaniensis n. sp. from Spain and considerations on the phylogenetic relationship among selected genera in the ...

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References (64)

Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
1388-5545
eISSN
1568-5411
DOI
10.1163/138855409X12559479585043
Publisher site
See Article on Publisher Site

Abstract

AbstractA new amphimictic species, Pratylenchus hispaniensis n. sp., parasitising theroots of gum cistus in Andújar (Jaén), southern Spain, is described. The newspecies is characterised by the presence of numerous males and by the femalehaving a lip region with three annuli, a divided face, a robust stylet(14.5-17.0 μm) with rounded knobs, lateral fields with four lines, V =80-84, a round spermatheca full of sperm, well developed post-vulval uterinesac and an obliquely truncate tail with irregularly annulated terminus.Morphologically this species is related to P. bhatti, P. kralli, P.mediterraneus, P. pseudofallax and P. thornei. A phenetic study of the 25most useful diagnostic morphological and allometric characters forPratylenchus species was done using multivariate factor and lineardiscriminant analyses. In the factor analysis the first seven factorsaccounted for 71.1% of the total variance of the characters selected. Thesefactors were related to female tail, pharyngeal overlap, reproductivebehaviour, stylet length, L/post-vulval uterine sac ratio, body length andnumber of lip annuli. Discriminant analysis differentiated Pratylenchus spp.from the three valid species of Zygotylenchus. The results of thephylogenetic analysis based on sequences of the D2-D3 expansion regions of28S, partial 18S and ITS rRNA genes confirmed the close relationship of P.hispaniensis n. sp. with P. mediterraneus and inferred molecular affinitywith P. brzeskii, P. neglectus and P. thornei, in spite of variation in theposition of P. hispaniensis n. sp. in the clades. Additional phylogeneticanalyses based on the same sets of sequences for P. hispaniensis n. sp.,Zygotylenchus guevarai and other Pratylenchidae indicated that Pratylenchusincludes several paraphyletic lineages; however, likelihood tests did notreject monophyly of the genus. The inclusion of Pratylenchus, Zygotylenchus,Hirschmanniella, Nacobbus and Apratylenchus in Pratylenchidae wassupported.

Journal

Nematology – Brill

Published: Jan 1, 2010

Keywords: D2-D3 REGION; TAXONOMY; MORPHOLOGY; SHIMODAIRA-HASEGAWA TEST; CISTUS LADANIFER; SEM; MOLECULAR; ROOT-LESION NEMATODES; GUM CISTUS; MORPHOMETRICS

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