Genetic control of long glume phenotype in tetraploid wheat derived from Triticum petropavlovskyi Udacz. et Migusch.

The Chinese wheat landrace, Xinjiang rice wheat (T. petropavlovskyi Udacz. et Migusch., 2n = 42), known as 'Daosuimai' or rice-head wheat is characterized by long glumes, and was found in the agricultural areas in the west part of Talimu basin, Xinjiang, China in 1948. The gene for long glume from T. petropavlovskyi was introduced into a line of spring durum wheat, LD222. The gene for long glume is located approximately 46.8 cm from the cn-AI locus, which controls the chlorina trait. Significant deviation from a 3:1 in the F-2 of LDN 7D(7A)/ANW5C confirmed that the long glume of T. petropavlovskyi can be controlled by a gene located on chromosome 7A. The gene locates approximately 12.4 +/- 0.5 cM from the centromere on the long arm of 7A. It is considered that the gene for long glume from T. petropavlovskyi is an allele on the P(1)locus, and it should be designated as P-1a. It is suggested that T. petropavlovskyi originated from either the natural hybrid between T. aestivum that has an awn-like appendage on the glume and T. polonicum or a natural point mutation of T. aestivum.