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

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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.


Somatic metaphase plates of Helictotrichon species after FISH and fluorochome staining.
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plw039-F2: Somatic metaphase plates of Helictotrichon species after FISH and fluorochome staining.

Mentions: Figure 2 shows mitotic metaphases of H. setaceum, H. parlatorei, H. ×krischae and H. sempervirens after in situ hybridization and fluorochome staining. The respective idiograms of all taxa investigated are shown (Fig. 1). The karyotypes are constituted by seven pairs of chromosomes (Roman numerals; Fig. 1) in 2x H. setaceum, H. parlatorei and H. ×krischae, and three sets of seven chromosome pairs in 6x H. sempervirens. All chromosomes are metacentric with the exception of one pair in H. cf. ×krischae (chromosomes 3 and 4), which are submetacentric.


Genome evolution in alpine oat-like grasses through homoploid hybridization and polyploidy
Somatic metaphase plates of Helictotrichon species after FISH and fluorochome staining.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

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

plw039-F2: Somatic metaphase plates of Helictotrichon species after FISH and fluorochome staining.
Mentions: Figure 2 shows mitotic metaphases of H. setaceum, H. parlatorei, H. ×krischae and H. sempervirens after in situ hybridization and fluorochome staining. The respective idiograms of all taxa investigated are shown (Fig. 1). The karyotypes are constituted by seven pairs of chromosomes (Roman numerals; Fig. 1) in 2x H. setaceum, H. parlatorei and H. ×krischae, and three sets of seven chromosome pairs in 6x H. sempervirens. All chromosomes are metacentric with the exception of one pair in H. cf. ×krischae (chromosomes 3 and 4), which are submetacentric.

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.