Summary
First metaphase in pollen mother cells (pmc's) is described in the new hybrids, 2x Hordeum pusillum × 6x Triticum aestivum (2n = 28), 2x H. chilense × 2x Secale cereale (2n = 14), 4x H. jubatum ssp. breviaristatum × 2x S. africanum (2n = 21) and 2x H. vulgare × 6x H. murinum ssp. simulans (2n = 28), and for the first time in 6x H. murinum ssp. simulans × 2x H. vulgare (2n = 28) and 6x H. procerum × 2x H. vulgare (2n = 28). The intergeneric hybrids had no chiasmata at metaphase I except those between H. jubatum chromosomes in the hybrid with S. africanum. Multivalents were rare or absent and mean chiasma frequencies per euploid pmc (non-doubled) were 2·55, 2·50, 2·25 and 1·50 in H.jubatum × S. africanum, H. vulgare × H. murinum, and in H. murinum and H. procerum × H. vulgare, respectively. In hybrids with metaphase I chiasmata, 33–93 per cent of pmc's were aneuploid (or rarely polyploid) and in H. vulgare hybrids, somatic instability also occurred. No hybrid set seed.
Mitotic chromosomes (2n = 14) of the new hybrids 2x H. chilense × 2x S. africanum, 2x S. montanum and 2x S. vavilovii, and the hybrid, 2x H. vulgare × 2x S. africanum, are described for the first time. These hybrids were vigorous but have not flowered, probably through lack of vernalisation.
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Finch, R., Bennett, M. Mitotic and meiotic chromosome behaviour in new hybrids of Hordeum with Triticum and Secale. Heredity 44, 201–209 (1980). https://doi.org/10.1038/hdy.1980.17
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DOI: https://doi.org/10.1038/hdy.1980.17
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