Phylogenetic study of the tribe Potentilleae (Rosaceae), with further insight into the disintegration of Sibbaldia

Abstract

Potentilleae, one of 10 tribes of the Rosaceae, are mainly distributed in alpine regions of the Northern Hemisphere. The taxonomy of Potentilleae has been challenging due to extensive hybridization, polyploidization, and/or apomixis characterizing several genera of Potentilleae, such as Alchemilla, Argentina, and Potentilla. To help clarify relationships within Potentilleae, a phylogenetic analysis of the tribe with an emphasis on the polyphyletic genus Sibbaldia was carried out using nuclear ribosomal internal and external transcribed spacer regions and the plastid trnL‐F and trnS‐G spacer regions. In agreement with previous phylogenetic analyses, three major clades were identified in the present study: the subtribe Fragariinae, the genera Argentina, and Potentilla. The 15 species of Sibbaldia were recovered in five distinct clades: three in subtribe Fragariinae, one in Argentina, and the last in Potentilla. The recently established genus Chamaecallis, comprising a single species formerly treated in Sibbaldia that has intermediate floral character states with respect to Fragariinae and Potentilla, was recovered as sister to Drymocallis. Morphological character state reconstruction indicated that a reduction in the number of stamens (≤10) is a derived character state that has arisen multiple times in Potentilleae. Molecular dating analyses agreed with previously published estimates and suggested that crown group Potentilleae arose in the Middle to Late Eocene, with most generic‐level divergences occurring in the Oligocene and Miocene.

Complex patterns of reticulate evolution in opportunistic weeds (Potentilla L., Rosaceae), as revealed by low-copy nuclear markers

“…As previously shown in studies based on chloroplast and ribosomal data [14,15,18,20,23,44], the Ivesioid clade is deeply nested in Potentilla (Figs. 1, 2 and 3).…”

“…Within Potentilla in the strict sense, there are a number of well supported subclades, such as the Alba, Reptans and Ivesioid clades [23]. The most species-rich subclade, called either "Argentea" [23] or "core group" [18] in previous studies, is, however, in itself poorly resolved [18,20,23].…”

“…However, the debate on where to draw the generic delimitation is still ongoing; as whether to include the genus Argentina Hill. and its sisters [15,17] or not [18][19][20]. Regardless whether Argentina is included or not, the genus is still polyphyletic in certain classifications where Duchesnea (P. indica) and the genera of the North American Ivesioid clade (Horkelia Cham.…”

Fruit fossils of Rosoideae (Rosaceae) from the late Pliocene of northwestern Yunnan, Southwest China

“…Comment Our fossils have a curved shape, and a small dimension of at most 1.0 mm at their broadest part. Based on a survey of modern fruit and seed morphology in published works (Guo, ; Dowidar et al, ; Bojňanský & Fargašová, ; Nakayama et al, ), we found that achenes of three closely related genera, namely Duchesnea , Fragaria , and Potentilla (Eriksson et al, ; Potter et al, ; Feng et al, ), are of similar shape and size to our fossils. Achenes of these three genera are similar in morphology (Tantawy & Naseri, ), but some differences allow us to distinguish among them.…”

Sex and Rosaceae apomicts

“…Note that the JJCC allotetraploid was also formed in Rozanova's crosses by unreduced female gametes (JJ) of R. idaeus having been, Rozanova inferred, fertilized by reduced male gametes (CC) from the Permian race of R. caesius L.; in other words failure of meiotic reduction of female gametes is rare in diploid R. idaeus, but evidently may occur (*; Mavrodiev & Soltis, 2001). (Eriksen & Töpel, 2006;Feng & al., 2017). Gametophytic apomixis in Fragaria L. (also Potentilleae), however, appears to be evident only following hybridization (Asker & Jerling, 1992;Dziadczyk & al., 2011;Leszczuk & al., 2018), although even then evidence for its occurrence has been seen as equivocal (Nosrati & al., 2010;Dobeš & al., 2015).…”