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Morphological and molecular characterisation of several Paratylenchus Micoletzky, 1922 (Tylenchida: Paratylenchidae) species from South Africa and USA, together with some taxonomic notes
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Pin nematodes of the genusParatylenchusare widely distributed across the world and associated with many plant species. Morphological identification ofParatylenchusspecies is a difficult task because it relies on many characters with a wide range of intraspecific variation. In this study we provide morphological and molecular characterisation of several pin nematodes:Paratylenchus aquaticus,P. dianthus,P. hamatus,P. nanusandP. straeleni, collected in different states of the USA and South Africa.Paratylenchus aquaticusis reported from South Africa and Hawaii andP. nanusis found from South Africa for the first time. Morphological descriptions, morphometrics, light and scanning electron microscopic photos and drawings are given for these species. Molecular characterisation of nematodes using the D2-D3 of 28S rRNA and ITS rRNA gene sequence revealed that samples morphologically identified asP. aquaticus,P. hamatusandP. nanusindeed represent species complexes containing several species. Sequences of the rRNA genes are also provided for several unidentifiedParatylenchus. Phylogenetic relationships within the genusParatylenchusare given as inferred from the analyses of the D2-D3 of 28S rRNA and ITS rRNA gene sequences. We present here the most complete phylogenetic analysis of the genus.
Title: Morphological and molecular characterisation of several Paratylenchus Micoletzky, 1922 (Tylenchida: Paratylenchidae) species from South Africa and USA, together with some taxonomic notes
Description:
Pin nematodes of the genusParatylenchusare widely distributed across the world and associated with many plant species.
Morphological identification ofParatylenchusspecies is a difficult task because it relies on many characters with a wide range of intraspecific variation.
In this study we provide morphological and molecular characterisation of several pin nematodes:Paratylenchus aquaticus,P.
dianthus,P.
hamatus,P.
nanusandP.
straeleni, collected in different states of the USA and South Africa.
Paratylenchus aquaticusis reported from South Africa and Hawaii andP.
nanusis found from South Africa for the first time.
Morphological descriptions, morphometrics, light and scanning electron microscopic photos and drawings are given for these species.
Molecular characterisation of nematodes using the D2-D3 of 28S rRNA and ITS rRNA gene sequence revealed that samples morphologically identified asP.
aquaticus,P.
hamatusandP.
nanusindeed represent species complexes containing several species.
Sequences of the rRNA genes are also provided for several unidentifiedParatylenchus.
Phylogenetic relationships within the genusParatylenchusare given as inferred from the analyses of the D2-D3 of 28S rRNA and ITS rRNA gene sequences.
We present here the most complete phylogenetic analysis of the genus.
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