Identification of the Extra Chromosomes of the Primary Trisomics in Durum Wheat, Triticum durum var. hordeiforme by Wright C-banding Technique

抄録

The primary trisomics in durum wheat, Triticum durum var. hordeiforme (2n=4x=28) were obtained from the hybrid progeny of the hexaploid (2n=6x=42) which was derived from the cross between the artifically induced octoploid (2n=8x=56) and tetraploid plant. In order to analyze the extra chromosome in each trisomic plants, Wright C-banding technique was applied, and then 13 primary trisomics out of the theoretically possible 14 trisomic types were cytologically identified. Thirteen trisomics consist of 7 types including extra chromosomes of A genome; 1A, 2A, 3A, 4A, 5A, 6A, 7A and 6 types of B genome; 1B, 2B, 4B, 5B, 6B, 7B. Thirteen primary trisomic types were different from normal plant and others in their external morphological traits. However, it was somewhat difficult to recognize morphologically the trisomic types containing A genome chromosome derived from the type with homoeologous chromosome in B genome.