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

摘要

Triticum turgidum ssp. polonicum and T. ispahanicum were characterized by the long glume phenotype. P 1 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 P 2 gene located on chromosome 7B. In the present study, aneuploid stocks of `Langdon' durum wheat were used to map the genes, P 1 and P 2. P 1 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 – P 2 – cn-BI (chlorina). P 2 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 P 1 and P 2 genes may be useful as genetic markers in tetraploid wheat.