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Inheritance of the characters controlled by odd chromosomes on the data of the transmission of monosomic added chromosome of Elymus sibiricus St genome
SUMMARY. On the basis of the winter bread wheat variety Obryi, two independent disomic addition stocks BC12F∞ with the chromosome of E. sibiricus St 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 p2Ц(1 + f1Цf4) × p + f1 = 0, where p is the probability of the formation of viable gametes with the chromosome; f1 and f4 Ц 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 (1Цf4) by the equation p♂ = 1Ц f4/(1Цp♀). 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 Ц 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
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|Coded & Designed by Volodymyr Duplij||Modified 08.12.22|