Beschreibung:
<jats:sec>
<jats:title>Abstract</jats:title>
<jats:p>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.</jats:p>
</jats:sec>