Abstract
Hybrids between the two diploid species Festuca donax and F. drymeja had regular chromosome association, forming 7 bivalents at metaphase I. However, when the two species were crossed with a third species F. scariosa, the hybrids involving F. drymeja showed greater desynapsis than those with F. donax. When the F1 hybrid F. donax × F. drymeja was crossed with F. scariosa, the trispecific progeny could be grouped into three classes according to the degree of desynapsis recorded. Abnormalities associated with the fusion of pollen mother cells, which produced highly polyploid cells, were also observed in the trispecific hybrids. Failure of chromosomal pairing and the occurrence of syncytes is attributed to genotypic interactions.
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Morgan, W.G., Thomas, H. & Kirby, M. A study of chromosome association in hybrids between diploid species of Festuca . Chromosoma 75, 117–127 (1979). https://doi.org/10.1007/BF00330629
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DOI: https://doi.org/10.1007/BF00330629