Université de Neuchâtel

Evolution of moonwort ferns ("Botrychium", Ophioglossaceae) on local to global scales

Dauphin, Benjamin ; Grant, Jason (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Plants have long fascinated biologists by their ability to form cryptic species, hybrids between distinct species, large and stable genome sizes, and a wide variety of mating systems among taxa that have driven to the current plant biodiversity. More than 450 million year ago, vascular plants emerged and colonized the land. Rapidly, they dispersed to explore new habitats and diversified in...

Université de Neuchâtel

Rapid allopolyploid radiation of moonwort ferns (Botrychium; Ophioglossaceae) revealed by PacBio sequencing of homologous and homeologous nuclear regions

Dauphin, Benjamin ; Grant, Jason R ; Farrar, Donald R ; Rothfels, Carl J

In: Molecular Phylogenetics and Evolution, 2018, vol. 120, p. 342-353

Polyploidy is a major speciation process in vascular plants, and is postulated to be particularly important in shaping the diversity of extant ferns. However, limitations in the availability of bi-parental markers for ferns have greatly limited phylogenetic investigation of polyploidy in this group. With a large number of allopolyploid species, the genus Botrychium is a classic example in...

Université de Neuchâtel

Molecular phylogenetics supports widespread cryptic species in moonworts (Botrychium s.s., Ophioglossaceae)

Dauphin, Benjamin ; Vieu, Julien ; Grant, Jason R

In: American Journal of Botany, 2014, vol. 101, no. 1, p. 128–140

Premise of the study: Previous phylogenetic studies of moonworts (Botrychium sensu stricto (s.s.)) included few taxa from outside of North America. This low geographical representation limited interpretations of relationships of this group rich in cryptic species. With 18 out of 30 species in the genus being polyploid, understanding their evolutionary history remains a major challenge....

Université de Fribourg

Ploidy level and genome size variation in the homosporous ferns Botrychium

Dauphin, Benjamin ; Grant, Jason ; Mráz, Patrik

In: Plant Systematics and Evolution, 2016, vol. 302, no. 5, p. 575–584

Recent cytological and molecular studies have investigated genome size variation and evolution in the homosporous ferns, but representatives of the Ophioglossaceae were largely overlooked, despite their evolutionary singularity. Flow cytometry analysis was performed on 41 individuals of eight species of the genera Botrychium (B.), Botrypus, and Sceptridium to estimate their ploidy level...