Abstract
The transmission of rye B chromosomes in experimental populations of Secale cereale and S. vavilovii was studied. B chromosomes were introduced from S. cereale into S. vavilovii by hybridisation and backcrossing. Populations were established with plants carrying 0B or 2B chromosomes at different frequencies. Each population was isolated and allowed to fertilise by open pollination. Seeds were collected individually from each 0B or 2B plant. The number of B chromosomes in the offspring was analysed. The results showed that there was not a direct relationship between the frequencies at which each type of pollen was formed and the offspring obtained. On the contrary, the effectiveness in fertilisation by pollen with or without B chromosomes was mainly dependent on the frequencies of plants with and without B chromosomes in the population; that is, pollen carrying B chromosomes became relatively more advantageous when its frequency declined. We discuss the proposal that frequency-dependent selection occurs for rye B chromosomes.
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Puertas, M., Baeza, F. & de la Peña, A. The transmission of B chromosomes in populations of Secale cereale and Secale vavilovii 1. Offspring obtained from 0B and 2B plants. Heredity 57, 389–394 (1986). https://doi.org/10.1038/hdy.1986.138
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DOI: https://doi.org/10.1038/hdy.1986.138
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