Inheritance of the characters controlled by odd chromosomes on the data of the transmission of monosomic added chromosome of Elymus sibiricus S^t genome

Motsnyi І.І., Kulbida M.P.

SUMMARY. On the basis of the winter bread wheat variety Obryi, two independent disomic addition stocks BC₁₂F_∞ with the chromosome of E. sibiricus S^t genome have been creat-ed. A practical algorithm for determining the probabilities of transmission of odd chromosome through male and female gametes singly at self-pollination of he-mizygous hybrids has been proposed from the equation p²–(1 + f₁–f₄) × p + f₁ = 0, where p is the probability of the formation of viable gametes with the chromosome; f₁ and f₄ – the empirical frequencies of the corresponding homozygotes with and without the character. The probability of transferring an alien univalent chromosome via pollen (p_♂) is related to the frequency of its trans-mission via the egg (p_♀) during the backcross and at self-pollination (1–f₄) by the equation p_♂ = 1– f₄/(1–p_♀). Calculated empirically dependent estimates of the pro-babilities of transmission of the added chromosome via the egg p_♀ = 18,7 % and via the pollen p_♂ = 4,3 % correspond to the empirical frequencies obtained on the backcrosses. The coefficients of the gamete selection V_♀ = 0,748 and V_♂ = 0,172 have been calculated, and the expected segregation on an alien character, controlled by a dominant gene located in the added chromosome has been determined – with the character : without the character = 0.222 : 0.778 in F₂; 0.187 : 0.813 at equation and 0.043 : 0.957 at certation backcrosses.

Key words: Triticum aestivum L., an added chromosome, phenotypic markers, gametes, zygotes, genetic analysis

Tsitologiya i Genetika 2018, vol. 52, no. 4, pp. 23-34