Inheritance of organelle DNA in barley and Hordeum × Secale intergeneric hybrids

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Abstract
Four reciprocal hybrids of Hordeum vulgare (deficiens type) and seven nonreciprocal hybrids resulting from controlled pollination between two Hordeum and three Secale species were assayed for variation in their organelle DNA. The chloroplast and mitochondrial DNAs of these hybrids were distinct. Genetic variability exists within species of the genus Hordeum with organelle transmission being strictly maternal. On the other hand, biparental inheritance was obtained in the intergeneric hybrids involving Hordeum and Secale. There was selective transmission of Secale bands and the number of gene copies transmitted through the pollen was under genetic control. No recombination occurred between the two parental genomes.