Cytology and fertility of trifolium repens trifolium ambiguum trifolium hybridum and interspecific hybrids

Williams, E.G.; Plummer, J.; Phung, M.

New Zealand Journal of Botany 20(2): 115-120

1982


ISSN/ISBN: 0028-825X
Accession: 005087151

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Abstract
Meiotic chromosome pairing and pollen fertility data are given for T. repens, T. ambiguum (2x) and (4x), T. hybridum (2x) and (4x), and the hybrids T. ambiguum (4x) .times. T. repens (F1, F2, F3, and backcross to T. repens), and T. ambiguum (4x) .times. T. hybridum (2x). Some autosyndesis of T. repens chromosomes occurs in hybrids with T. ambiguum. This is in keeping with previous evidence for the presence in T. repens of a genetic mechanism to control preferential bivalent pairing, which breaks down after interspecific hybridization. Pairing of homoelogous T. repens chromosomes in hybrids provides an opportunity for release of new variation by novel recombinational events not possible in the parent species. Variable low fertility in the hybrids is not associated with gross meiotic abnormalities, but may be caused by genetic deficiencies resulting from independent assortment of intraspecific homoeologous chromosomes which normally assort together.