Use of recombinant materials in selection of parent components of sugar beet hybrids in the root shape

Abstract

The purpose. Creation and implementation in selection process of recombinant materials of beet with improved parameters of the shape of root for the further selection of parent components of hybrids of sugar beet on CMS basis. Methods. Field, laboratory, statistical. Results. By results of probes they selected one-seeded forms of sugar beet (candidates for lines of O-type) with improved shape of root, gained by fission of hybrid materials of different genetic structure. It is fixed that the extent of setting of seeds at autogamy of plants is low enough (16,4–25,3%), and it is also observed lowering sowing qualities of seeds of inbreeding-materials. These materials were characterized by oval-conic and wide-conic shape of roots (index «F» was within the limits of 0,98–1,24). Analysis of biometrical indexes of roots testifies to the following: in newly created materials in comparison with sugar beet (lines of O-type) have descended essential augmentation of length of a root (on 9,1%), distances from the plane of maximum diameter of a root to vertex of a head (37,0%), and mass of a root (28,6%). First backcross mating is accomplished of the select forms with pollinators-fixers of sterility, and heightening level of sugariness of roots and penetrances of genes xxzz (up to 50%) at hybrids BC1 is achieved. Conclusions. Recombinant genotypes of plants are the valuable initial stock for selection of parent components of hybrids of sugar beet by the shape of a root. At use of hybridization and inbreeding already in the 2-nd generation of hybrids (F2) it is possible to select candidates for pollinators-fixers of sterility (lines of O-type) with oval-conic and wide-conic shape of roots. That attribute is stably inherited by offspring at the subsequent stages of selection on building lines of pollinators-fixing agents of sterility and their CMS analogs.