Dependence of out-crossing indices on genotypic features in common wheat

The out-crossing indices (out-crossing rate, rate of plants on which out-crossing had occurred, and out-crossing intensity) in F₂ plants of soft winter wheat derived from the reciprocal crossing B-16 × Odesskaya Krasnokolosaya are analyzed using storage proteins as genetic markers. The out-crossing index is substantially dependent on the growing conditions. The out-crossing rate in a reciprocal population amounted to 0.35% (Odessa, 2000) and 5.11% (Kiev, 2004). The greatest out-crossing indices are observed in homozygotes for the presence of the rye 1BL/1RS translocation. The value of the out-crossing index in heterozygotes for the presence of this translocation is intermediate. Differences in the out-crossing index between plant populations derived from direct and reciprocal crossings are found. The multidirectionality of these differences with respect to out-crossing rate and the percentage of plants with out-crossing, on the one hand, and the out-crossing intensity, on the other hand, is noted.