Abstract
Variation in C-banding was studied in seven populations ofAllium schœnoprasum from eastern N. America, including populations referable to var.sibiricum, var.laurentianum, and ± intermediate. 23 bands were recognized on five pairs of chromosomes, and were treated as 23 loci. No banding site was monomorphic throughout the plants studied. The level of polymorphism per population was >60%, and the average heterozygosity values varied from 0.21 to 0.27. The various “banding patterns” of chromosomes were shown to depend on the random combination of individual bands. Nei's genetic distances between populations varied from 0 to 0.070 (mean: 0.033). The matrix of genetic distances was analysed by non-metric multidimensional scaling, and the results showed a significant relationship between longitude and population scores on the ordination. The chromosomal data did not clearly discriminate between the two native varieties ofA. schœnoprasum, but were interpreted as a longitudinal cline. It is suggested that studies of C-banding variation in vascular plants should focus on individual banding sites, rather than on whole chromosome banding patterns.
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Tardif, B., Morisset, P. Chromosomal C-band variation inAllium schœnoprasum (Liliaceae) in eastern North America. Pl Syst Evol 174, 125–137 (1991). https://doi.org/10.1007/BF00940335
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DOI: https://doi.org/10.1007/BF00940335