Apomixis and reticulate evolution in the Asplenium monanthes fern complex

Abstract

Multiple origins of apomixis are inferred, in both alloploid and autoploid forms, within the A. resiliens and A. monanthes clades.

It is worth checking old data – validation of Asplenium onopteris L. presence in the most northeastern sites in Europe (Sudetes, SW Poland)

“…A comparable variability was earlier reported in A. onopteris and A. balearicum Shivas [66]. Likely, it is a genus-dependent feature, in some ferns not related to the ploidy level [60,62,63], and invalid in the A. adiantum-nigrum complex. More stable feature was the spore size, slightly differing between diploid (A. onopteris and A. cuneifolium) and tetraploid species (A. adiantum-nigrum); importantly, in the latter taxon, probably due to its hybrid origin, values overlap with those of both parental species.…”

“…In polyploid series, micromorphological features are often used as indirect markers of the taxon, related to its ploidy level [60][61][62][63][64][65]. However, in the A. adiantum-nigrum complex, we found the stomata size less useful in taxon delimitation, varying in populations of a given taxon with values overlapping and similar to each other, regardless of the taxon ploidy.…”

Recurrent hybridization without homoeologous chromosome paring in the <i>Dryopteris varia</i> complex (Dryopteridaceae)

“…Apogamous ferns get genetic variation through hybridization maintaining maturity of their spores in three patterns: (1) tetraploid apogamous hybrid between triploid apogamous species and diploid sexual species (Walker 1962; Watano and Iwatsuki 1988;Grusz et al 2009;Dyer et al 2012); (2) tetraploid apogamous hybrid between diploid apogamous species and tetraploid sexual species (Walker 1962); (3) triploid apogamous hybrid between diploid apogamous species and diploid sexual species (Walker 1962; Suzuki and Iwatsuki 1990;Chao et al 2012;Jaruwattanaphan et al 2013); (4) triploid apogamous hybrid between triploid apogamous species and diploid sexual species (Hori et al 2014); (5) tetraploid apogamous hybrid between can be triploid apogamous species and tetraploid sexual species (Ebihara et al 2012). Other patterns of hybridization produce abortive or irregular-shaped spores (Park and Kato 2003; Erkt and Koutecky 2016).…”

First insights into the evolutionary history of the <I>Davallia repens</I> complex

“…The Malesia region then not only harbours more than 90 % of the species of Davalliaceae (Nooteboom 1992(Nooteboom , 1994, but also contains a high morphological variation of D. repens complex (this study). Since diploids are generally considered to thought to be the primitive cytotype (Ebihara et al 2005, Grusz et al 2009, Rousseau-Gueutin et al 2009, Dyer et al 2012, the Malesian region is not only the diversity hotspot for Davalliaceae, but also the centre of origin of the D. repens complex.…”