THE HYBRID TRITICUM-TURGIDUM SSP. DICOCCUM X DASYPYRUM-VILLOSUM AND THE CROSS AND BACKCROSSES TO BREADWHEAT, TRITICUM-AESTIVUM

Triticum turgidum ssp. dicoccum was crossed to Dasypyrum villosum. The primary hybrid was crossed to T. aestivum cv. 'Chinese Spring', and t he resulting triple hybrid was backcrossed twice to the Swedish variet y 'Kadett' and 'Chinese Spring'. The seed set was higher when 'Kadett' served as the recurrent parent (3% in the triple hybrid and 15% in BC 1), than it was with 'Chinese Spring' (0.8 and 1%, respectively). The plants of BC1 and BC2 had brittle rachis, and spike morphology varied from short and club-like to long and sparse. The pollen grain stainabi lity in BC1 and BC2 plants ranged from 0 to 65% and 14 to 91%, respect ively. There was little correlation between pollen grain stainability and seed set. From the triple hybrid to BC2, the chiasma frequency per microsporocyte increased from 12.4 to 35.4. The BC2F2 and F-3 plants are evaluated for agronomic traits.