An international team led by Harald Schneider showed that both newly formed polyploids (neopolyloids) and polyploid lineages (paleopolyploidy) contribute to the accumulation of species diversity of Asplenium, the most species rich genus of ferns (see http://onlinelibrary.wiley.com/doi/10.1111/jse.12271/full).
Analyses of the geographic distribution of polyploidy recovered evidence for a higher rate of polyploidy in tropical climates compared to temperate and boreal climates. The increased accumulation of polyploidy in tropical plants have not been documented before but this new findings are consistent with predictions based on the emerging macroevolutionary concepts of polyploidy in plants.
The research team included several researchers at XTBG besides researchers of researcher institutes around the globe. This paper is published as an invited contribution to the special issues of the Journal of Systematics and Evolution celebrating the XIX International Botanical Congress held in Shenzhen, China.
Phylogeny of Aspleniaceae with the main clades marked. Donuts indicate the proportion of species (dark green) per main clade contributed to the total species diversity, whereas piecharts indicate the proportion of polyploid per main clades (scored as 2x, 4x, >4x). Branch colour correspond to climatic preferences, dark red = tropics, dark and bright blue = temperate, pink = transition between the two climate zones.