Some Triticum turgidum L. cultivars possessing the chromosome T1BL.1RS substitution

Six durum wheat (Triticum turgidum L.) cultivars were pollinated by Cando/V eery to produce chromosome 1B, T1BL.1RS F-1 heterozygotes. Each F-1 combina tion was pollinated by its respective durum maternal parent to yield the fi rst backcross (BC1) derivatives. Heterozygous 1B, T1BL.1RS plants were iden tified by glucose phosphate isomerase (GPI) electrophoresis and Giemsa C-ba nding. These BC1F1 heterozygotes were backcrossed further to their durum pa rents to yield BC2 derivatives, which were similarly advanced to BC7 and th en self-pollinated. From the selfed progeny, plants homozygous for chromoso me 1B and T1BL.1RS were identified biochemically and cytologically. We disc uss here the utility and uniqueness of this germplasm to elucidate the cont ributions of the 1RS translocated chromosome arm in different durum genotyp es.