Limits...
Genome evolution in alpine oat-like grasses through homoploid hybridization and polyploidy

View Article: PubMed Central - PubMed

ABSTRACT

Molecular cytogenetic and phylogenetic analysis of alpine endemic wild oats of genus Helictotrichon represents a remarkable example of speciation and diversification through homoploid hybridisation and polyploidisation. Results suggest a primary centre of species establishment in the eastern regions of the Alps, with the westward expansion and subsequent ice age interruption resulting in a recently disjunct distribution between populations of the southwestern and southeastern Alps.

No MeSH data available.


Related in: MedlinePlus

Collection sites of studied taxa of the H. parlatorei group in the Alps and simplified general geographical distribution of H. parlatorei (blue dotted line) and disjunct areas of H. setaceum subsp. setaceum in the West and subsp. petzense in the East (red dotted lines). Circles filled with checkerboard pattern indicate hybrid character in molecular and cytogenetic analyses.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4940509&req=5

plw039-F3: Collection sites of studied taxa of the H. parlatorei group in the Alps and simplified general geographical distribution of H. parlatorei (blue dotted line) and disjunct areas of H. setaceum subsp. setaceum in the West and subsp. petzense in the East (red dotted lines). Circles filled with checkerboard pattern indicate hybrid character in molecular and cytogenetic analyses.

Mentions: Westward expansion of this diploid hybrid (or hybrid swarm) initially resulted in a large southern alpine distribution area. Most probably during the ice age glaciations this range became fragmented into two distinct areas in the eastern and the western Alps with a gap in distribution of ca. 600‚ÄČkm. It is possible that in the western area harboring currently H. setaceum subsp. setaceum and H. sempervirens (whose genome also indicates a hybrid origin), polyploidization took place in the latter species after isolation of the glacial refuges. Another hypothesis implies that hybridization took place at least two times in parallel in the western and the eastern Alps followed by polyploidization only in western H. sempervirens and genome diploidization (Fig. 3).Figure 2.


Genome evolution in alpine oat-like grasses through homoploid hybridization and polyploidy
Collection sites of studied taxa of the H. parlatorei group in the Alps and simplified general geographical distribution of H. parlatorei (blue dotted line) and disjunct areas of H. setaceum subsp. setaceum in the West and subsp. petzense in the East (red dotted lines). Circles filled with checkerboard pattern indicate hybrid character in molecular and cytogenetic analyses.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940509&req=5

plw039-F3: Collection sites of studied taxa of the H. parlatorei group in the Alps and simplified general geographical distribution of H. parlatorei (blue dotted line) and disjunct areas of H. setaceum subsp. setaceum in the West and subsp. petzense in the East (red dotted lines). Circles filled with checkerboard pattern indicate hybrid character in molecular and cytogenetic analyses.
Mentions: Westward expansion of this diploid hybrid (or hybrid swarm) initially resulted in a large southern alpine distribution area. Most probably during the ice age glaciations this range became fragmented into two distinct areas in the eastern and the western Alps with a gap in distribution of ca. 600‚ÄČkm. It is possible that in the western area harboring currently H. setaceum subsp. setaceum and H. sempervirens (whose genome also indicates a hybrid origin), polyploidization took place in the latter species after isolation of the glacial refuges. Another hypothesis implies that hybridization took place at least two times in parallel in the western and the eastern Alps followed by polyploidization only in western H. sempervirens and genome diploidization (Fig. 3).Figure 2.

View Article: PubMed Central - PubMed

ABSTRACT

Molecular cytogenetic and phylogenetic analysis of alpine endemic wild oats of genus Helictotrichon represents a remarkable example of speciation and diversification through homoploid hybridisation and polyploidisation. Results suggest a primary centre of species establishment in the eastern regions of the Alps, with the westward expansion and subsequent ice age interruption resulting in a recently disjunct distribution between populations of the southwestern and southeastern Alps.

No MeSH data available.


Related in: MedlinePlus