RESISTANCE TO BARLEY YELLOW DWARF LUTEOVIRUS IN AEGILOPS SPECIES

One thousand acid ninety-seven Aegilops accessions were evaluated for their reaction to a PAV serotype of barley yellow dwarf luteovirus (BY DV). The accessions tested belong to the species bicornis, biuncialis, caudata, crassa, columnaris, comosa, cylindrica, kotschyi, longissima , mutica, neglecta (= triaristata 4 x), ovata, peregrina, searsii, sha ronensis, speltoides, tauschii (= squarrosa), triuncialis, umbellulata , uniaristata, vavilovii and ventricosa. The first evaluation of virus levels in tile different accessions was conducted at International Ce nter for Agricultural Research in the Dry Areas (ICARDA), Aleppo, Syri a, using double antibody sandwich ELISA (DAS-ELISA). Accession reactio n ranged from highly resistant to highly susceptible. Thirty-eight Aeg ilops accessions resistant at ICARDA, were evaluated at Sainte-Foy, Qu ebec, Canada, by tissue-blot immunoassay. Diversity of response to BYD V infection was again observed in this elite group. Seven accessions b elonging to the species biuncialis, caudata, neglecta and triuncialis were highly BYDV resistant at both locations; five of these originated from Bulgaria.