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Allozymic variation and relationships withinViola subsectionViola (Violaceae)

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Abstract

Allozyme markers from ten European taxa ofViola subsectionViola suggest that this group is allotetraploid, based on x = 5. All taxa had distinct multilocus phenotypes exceptV. alba subspp.alba andscotophylla, which were identical and different from subsp.dehnhardtii. Variation was consistently higher in Mediterranean populations than in North European ones. Hybridisation seems extensive but putative F1 hybrids were distinctly less fertile than the parental species. Nevertheless, increased fertility in later-generation hybrids and shared band patterns among taxa indicate an important role of hybridisation and introgression in past and present evolution within the subsection. The octoploidV. ambigua shows affinity toV. hirta (tetraploid). The octoploidV. suavis probably originated fromV. pyrenaica and other unidentified tetraploids, and high variability suggests polytopy or even polyphyly. The stoloniferous condition (seriesFlagellatae) seems to be primitive in the subsection but the reduction of stolons (seriesEflagellatae) may have originated multiple times.

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Marcussen, T., Borgen, L. Allozymic variation and relationships withinViola subsectionViola (Violaceae). Pl Syst Evol 223, 29–57 (2000). https://doi.org/10.1007/BF00985325

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