Abstract:
Intergeneric hybrids between Triticum aestivum L, and Karnah bunt (Neovassia indica) resistant accessions of two Aegilops species were produced in different frequencies. Aegilops variabilis was hybridized with Genaro 81, Mri- Buc-Pvn *S* and Chinese Spring at frequencies of 5.0 to 29.0%. The endosperm formation was normal, mature seeds were slightly shrivelled but germinated normally. The T. aestivum x Ace variabilis hybrids, genomica\ky represented as ABDUS, were cytologically normal, with 2n=5X=35 chromosomes. The mean meiotic associations at metaphase-I were categorized as pairing and expressed as 33.96 univalents + 0.52 rod bivalents over 56 meiocytes analyzed with a 0.52 mean Chaismata frequency. Hybrid production frequencies of T. aestivum cultivars Sind 81, ZA-77, Buc"S", Chinese Spring with Aa vavilcvi ranged between 1.7 to 313% Meiotic associations were 33.31 univalents + 0.19 ring bivalents + 2.94 rod bivalents + 0.81 trivalents over 32 meiocytes characteristic of 2n=6x=42 chromosomes that genomically were ABDDMS with a 4.94 mean chiasmata frequencyo The germplasm offers avenues of alien addition line development or Ph locus manipulation; events currently lacking for applied objective exploitation of these two species.
