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Molecular and morphological characterisation of the Heterodera avenae species complex (Tylenchida: Heteroderidae)

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Species of the Heterodera avenae complex, including populations of H. arenaria, H. aucklandica, H. australis, H. avenae, H. filipjevi, H. mani, H. pratensis and H. ustinovi, obtained from different regions of the world were analysed with PCR-RFLP and sequencing of the ITS-rDNA, RAPD and light microscopy. Phylogenetic relationships between species and populations of the H. avenae complex as inferred from analyses of 70 sequences of the ITS region and of 237 RAPD markers revealed that the cereal cyst nematode H. avenae is a paraphyletic taxon. The taxonomic status of the Australian cereal cyst nematode H. australis based on sequences of the ITS-rDNA and RAPD data is confirmed. Morphometrical and ITS-rDNA sequence analyses revealed that the Chinese cereal cyst nematode is different from other H. avenae populations infecting cereals and is related to H. pratensis. Bidera riparia Kazachenko, 1993 is transferred to the genus Heterodera as H. riparia (Kazachenko, 1993) comb. n. As a consequence, H. riparia Subbotin, Sturhan, Waeyenberge & Moens, 1997 becomes a junior secondary homonym and is renamed as H. ripae nom. nov. Morphological, morphometrical characters and RFLP profiles for identification of the nine species presently placed in the H. avenae species complex are given.


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