Podgayetskiy A. Phenotypic Expression of Main Economic Valuable Traits in Potato Multispecific Hybrids and in Their Progeny

The thesis deals with phenotypic expression of main agronomic characters in complex interspecific (involving phylogenetically distant species) hybrids, their backcrosses. The origin analysis of the material selected by high expression of main characters shows significant repetition of some parental forms in its progeny. This fact characterizes to some degree high genetic potential of backcrosses assessed in this respect. The optimal ways of developing valuable material (backcrossing, self-pollinating or crossing backcrosses one to another) are found out. The combining ability of some backcrosses is determined. Forms with high effect of general combining ability are selected by yieldability, starch content, number of tubers per plant and average weight of ware tuber; populations with high effect of special combining ability are also selected.