HERITAGE AND GENETIC CONTROL OF BARLEY PLANT HEIGHT

The inheritance of the height of barley plants was studied in the system of diallel crossing (66) in the conditions of the forest-steppe of the Middle Volga in contrasting hydrothermal conditions. An analysis of combinational ability according to B. Griffing and genetic analysis according to B. Hayman showed the predominance of additive effects in the control of the trait (inheritance by type of complete and incomplete dominance). The trait should be responsive to selection, which is confirmed by the heritability coefficients: in the broad sense (H2), 0.85-0.90 in the narrow sense (h2) 0.52-0.62. Dominant genes increased the height of plants. The presence of complementary epistasis increases the likelihood of negative transgressions, increasing the success of breeding to reduce plant height. None of the varieties of the diallel complex possessed all recessive alleles that reduced the trait. Varieties Anna and Omsky Golozyorny 1, with dominant alleles, will increase the height of plants in the offspring. These varieties should be used in combination with shorter parents. Varieties Condor and Margret have a higher number of recessive alleles and can be considered as donors of height reduction. Promising for selection hybrid populations have been identified.
Volga Region Farmland, Выпуск 1 (5) 2020