Random distribution of the number of chromosome pairings in interspecific hybrids of Lilium.

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Abstract
Meiotic metaphase I in PMC [pollen mother cells] was observed in 7 interspecific hybrids in Lilium [involving L. longiflorum, L. candidum, L. speciosum, L. henryi, L. auratum, L. amabile, L. regale, L. leichtlinii and L. dauricum]. The extent of chromosome pairing varied according to the cross combination. No significant differences were recognized between the observed and calculated random frequency distributions for the number of bivalents per cell except for 2 cases. The random distribution of bivalents in cells is explicable as the result of the chance pairing of homoeologous chromosomes with low attraction. Attraction range specific to each bybrid was given. Chiasma frequencies per bivalent tended to be in proportion to the mean pairing rates.

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