Abstract
Male meiosis and gametogenesis were studied at metaphase I, metaphase and anaphase of the first pollen grain mitosis, and bicellular and tricellular pollen grain stages in 2B rye plants belonging to the low (L) and high (H) B transmission rate lines previously selected. Our results show that B chromosome behaviour significantly differs in both lines whereas the behaviour of the normal complement does not differ. In the L line the Bs form univalents in 81.07 per cent of the metaphase I cells, and are conserved in 44.14 per cent of the pollen grains at first metaphase whereas the remaining Bs are eliminated as micronuclei. In the H line the Bs form bivalents in 87.71 per cent of the metaphase I cells, and are present in 82.48 per cent of pollen grains at first metaphase. The Bs of the L and H lines do not differ in their ability to undergo nondisjunction at first pollen grain anaphase. This indicates that the different B transmission in the L and H lines results from their differential ability to form uni- or bivalents at metaphase I, which determines their loss or conservation in the pollen grains. The L and H lines also differ in pollen viability at the tricellular stage because 19.75 per cent of pollen grains of the L line and only 1.2 per cent of the H line are inviable.
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Jiménez, M., Romera, F., González-Sánchez, M. et al. Genetic control of the rate of transmission of rye B chromosomes. III. Male meiosis and gametogenesis. Heredity 78, 636–644 (1997). https://doi.org/10.1038/hdy.1997.103
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DOI: https://doi.org/10.1038/hdy.1997.103
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