Telosomic mapping of the homoeologous genes for the long glume phenotype in tetraploid wheat

Abstract

Triticum turgidum ssp. polonicum and T. ispahanicum were characterized by the long glume phenotype. P1 gene determines the long glume phenotype of T. polonicum, and locates on chromosome 7A. T. ispahanicum has shorter glume than T. polonicum and the long glumephenotype is determined by P2 gene located on chromosome 7B. In the present study, aneuploid stocks of `Langdon' durum wheat were used to map the genes, P1 and P2. P1 located on the long arms of chromosome 7A and its map distances from the centromere was 14.5 cM. On chromosome 7B, four loci located as cc (chocolate black chaff) – Pc (purple culm) – centromere – P2 – cn-BI (chlorina). P2 located on the long arms of chromosome 7B and its map distances from the centromere was 11.7 cM. It was suggested that a paralogous gene set conditions long glume phenotype in the homoeologous group 7 chromosomes. The P1 and P2 genes may be useful as genetic markers in tetraploid wheat.