Introgression from tetraploid durum wheat to diploid Aegilops longissima and Aegilops speltoides

SummaryTetraploid to diploid introgression by means of interspecific triploid hybrids was followed in two species combinations:T. durum × Ae. longissima ABSlcombination.T. durum × Ae. speltoides ABS combination.Triploids set rare seeds when exposed to massive back pollination by their diploid parents.Third-hybrid generation progenies of both combinations were diploid 2n = 14 or almost diploid 2n = 15 or 16, with high fertility, and bore a close morphological resemblance to their respective diploid parent.Heredity (1974) 32, 171–181; doi:10.1038/hdy.1974.21