Modes of speciation and evolution of the sections inTaraxacum |
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Authors: | Jan Kirschner Jan Štěpánek |
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Institution: | 1. Department of Taxonomy and Biosystematics, Institute of Botany, Academy of Sciences, CZ-252 43, Pr?honice 1, Czech Republic
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Abstract: | Modes of evolution of species classified within different sections inTaraxacum involve diverse processes, viz. primary divergence of an ancestral sexual diploid, hybridization between a tetraploid apomict and a diploid sexual hybrid, differentiation of an advanced apomictic taxon at one ploidy level, hybridization between a sexual tetraploid and a sexual diploid, formation of a polyploid series from an apomictic ancestor of a lower polyploidy level, and remote hybridization between an autumn-flowering ancestral diploid and a spring-flowering derivative diploid or apomict. Various reproduction systems of the plants involved, different environments and different timing of the processes contribute to a very varied nature of the species groups. |
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