Origin and systematic position of Jacobaea vulgaris (Asteraceae) octoploids: genetic and morphological evidence

The role of polyploidy in shaping morphological diversity in natural populations ofPhlox amabilis

“…In accordance with our findings, recent studies examining taxonomy in autopolyploid systems have found that plants of differing ploidy levels can be distinguished, at least to a satisfactory degree, based on a multivariate morphometric approach, but no single trait distinguished cytotypes (Mráz et al, 2011; Sosa et al, 2012; Sosa and Dematteis, 2014; Hodálová et al, 2015; Laport and Ramsey, 2015). Some researchers have concluded that a relatively strong ability to discriminate suggests that specific status for each ploidy is appropriate (Judd et al, 2007; Mráz et al, 2011; Sosa and Dematteis, 2014).…”

“…Some researchers have concluded that a relatively strong ability to discriminate suggests that specific status for each ploidy is appropriate (Judd et al, 2007; Mráz et al, 2011; Sosa and Dematteis, 2014). Others have argued that intermediate ability to discriminate supports subspecific status (Hodálová et al, 2015; Laport and Ramsey, 2015), whereas low ability to discriminate may indicate that no taxonomic recognition is warranted (Hodálová et al, 2007; Španiel et al, 2008). However, an important caveat is that diploids and autopolyploids may represent classic cryptic species—scarcely distinct morphologically.…”

“…Systematists have been reluctant to recognize autopolyploids taxonomically as species if they are not morphologically distinct (Soltis et al, 2007; Španiel et al, 2008; Laport and Ramsey, 2015), regardless of whether other criteria for species recognition may be met. On the other hand, when morphological differentiation is apparent among plants of differing ploidy, it can be used to support taxonomic recognition of autopolyploids (Judd et al, 2007; Sosa and Dematteis, 2014; Hodálová et al, 2015). Using a multivariate approach to discriminate among putatively conspecific plants of different levels of ploidy could be a valuable tool to address taxonomic questions (Hardy, et al, 2000; Hodálová et al, 2007, 2015; Španiel et al, 2008; Li et al, 2010; Mraz et al, 2011; Sosa et al, 2012; Laport and Ramsey, 2015).…”

Single nucleotide polymorphism discovery via genotyping by sequencing to assess population genetic structure and recurrent polyploidization in Andropogon gerardii

“…Recurrent formation of allopolyploids has been well documented in the literature (Brochmann and Elven, 1992; Soltis and Soltis, 1999; Sharbel and Mitchell‐Olds, 2001; Soltis et al, 2004), and a growing body of evidence suggests that multiple origins of autopolyploids is not unusual either (Segraves et al, 1999; Ramsey et al, 2008; Grubbs et al, 2009; Hodálová et al, 2015). Given the lower levels of production of viable seed by 9 x cytotypes, repeated formation of the cytotype, combined with high levels of asexual (clonal) reproduction, may be the key factors behind the maintenance populations with very high percentages of 9 x plants.…”

DNA ploidy in Salix retusa agg. only partly in line with its morphology and taxonomy

“…It would assume long-term isolation between the western Carpathian and south-eastern Cartpathian populations of S. retusa s.l., or even a polytopic origin of polyploidy in this group of willows during multiple glaciation cycles in the Pleistocene. Multiple autopolyploid origins have already been shown in some other species (Soltis and Soltis 1999, Mráz et al 2008, Grubbs et al 2009, Richardson et al 2012, Hodálová et al 2015. Nevertheless, both morphology and partly also ploidy level of S. retusa s.l.…”