Molecular data and ploidal levels indicate several putative allopolyploidization events in the genus Potentilla (Rosaceae)

Abstract

Several naturally occurring hybrids in Potentilla (Rosaceae) have been reported, but no molecular evidence has so far been available to test these hypotheses of hybridization. We have compared a nuclear and a chloroplast gene tree to identify topological incongruences that may indicate hybridization events in the genus. Furthermore, the monophyly and phylogenetic position of the proposed segregated genera Argentina, Ivesia and Horkelia have been tested. The systematic signal from the two morphological characters, style- and anther shape, has also been investigated by ancestral state reconstruction, to elucidate how well these characters concur with the results of the molecular phylogenies. Six major clades, Anserina, Alba, Fragarioides, Reptans, ivesioid and Argentea, have been identified within genus Potentilla. Horkelia, Ivesia and Horkeliella (the ivesioid clade), form a monophyletic group nested within Potentilla. Furthermore, the origin of the proposed segregated genus Argentina (the Anserina clade) is uncertain but not in conflict with a new generic status of the group. We also found style morphology to be an informative character that reflects the phylogenetic relationships within Potentilla. Five well-supported incongruences were found between the nuclear and the chloroplast phylogenies, and three of these involved polyploid taxa. However, further investigations, using low copy molecular markers, are required to infer the phylogeny of these species and to test the hypothesis of hybrid origin.

Past Climate Change and Plant Evolution in Western North America: A Case Study in Rosaceae

“…It is nested within Potentilla L. (cinquefoil) in the Rosaceae – a cosmopolitan family of large ecological and economic importance, which includes many edible fruits (apples, plums, cherries, pears, strawberries, almonds) as well as ornamentals (roses, firethorns, hawthorns). As currently circumscribed (Figures 1 and S1; [8]–[9], [11]–[12]), the ivesioid clade includes more than 50 species classified in three genera: Ivesia , Horkelia and Horkeliella [10], [13]–[14]. Common to many of them is that they grow under extremely dry conditions and have developed means to avoid drought (petrophily on protected rock faces, tolerance of alkalinity) or minimize water loss (increased pubescence, numerous minute leaflet segments in a tightly overlapping arrangement).…”

“…The ‘ivesioids’ are a well-supported plant clade [8]–[9] confined to western North America [10]. It is nested within Potentilla L. (cinquefoil) in the Rosaceae – a cosmopolitan family of large ecological and economic importance, which includes many edible fruits (apples, plums, cherries, pears, strawberries, almonds) as well as ornamentals (roses, firethorns, hawthorns).…”

A system of subtribe Potentillinae J. Presl (Rosaceae Juss.)

“…Some other phylogenetic studies puplished in between of Potter et al (2007) and Faghir et al (2014) also confirmed monophyly of Potentilla and division of Potentilleae onto two subtribes (e. g., Dobeš, Paule, 2010;Töpel et al, 2011).…”

Molecular Cytogenetic Analysis of <b><i>Cucumis</i></b> Wild Species Distributed in Southern Africa: Physical Mapping of 5S and 45S rDNA with DAPI

“…However, it is reasonable to speculate that the C. heptadactylus chromosome may be related to the C. myriocarpus (Ames 23540) and C. africanus (PI 542126 and PI 542127) chromosomes that have rch type III. Dioecy and polyploidy associations have been reported, for example, in the Lycium genus Venable, 2000, 2002;Yeung et al, 2005], the Potentilla genus [Cobon and Matfield, 1976;Holm and Ghatnekar, 1996;Töpel et al, 2011], and the Rubus genus [Sutherland, 2005]. The transition from monoecious diploids to dioecious polyploids by whole-genome duplication through conjunction with hybridization or by the generation of allo-or autopolyploids have been suggested as possible causes of loss-of-function phenotypes.…”