Sur quelques espèces de Bromes et leurs hybrides. 1. Révision du<i>Bromus maximus</i>Desf. d'après l'étude des peuplements naturels

Cugnac, Antoine de; Camus, Aimée

doi:10.1080/00378941.1931.10832895

Cited by 9 publications

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“…This result would suggest that the octoploid derived from hybridization between the hexaploid B. rigidus (as maternal genome donor) and the diploid B. sterilis , which agrees with the early hypotheses from morphology, experimental crosses ( Cugnac and Camus, 1931 ) and isozyme data ( Oja and Jaaska, 1996 ;Oja and Laarman, 2002 ). This result would suggest that the octoploid derived from hybridization between the hexaploid B. rigidus (as maternal genome donor) and the diploid B. sterilis , which agrees with the early hypotheses from morphology, experimental crosses ( Cugnac and Camus, 1931 ) and isozyme data ( Oja and Jaaska, 1996 ;Oja and Laarman, 2002 ).…”

Section: Comparison Of Data Sets and Monophyly Of Section Genea -supporting

confidence: 86%

Molecular phylogeny and reticulate origins of the polyploid Bromus species from section Genea (Poaceae)

Fortuné

Pourtau

Viron

et al. 2008

American J of Botany

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The origin of polyploid Bromus species of section Genea was investigated using molecular data. This group of annual species native from the Old-World is composed of three diploids, two tetraploids, one hexaploid, and one octoploid. Molecular cloning, sequencing, and phylogenetic analyses were performed on several accessions per species. We used the low copy nuclear gene Waxy, repeated rDNA spacers ITS1 and ITS2 and chloroplast spacers trnT-trnL and trnL-trnF. Our analyses revealed four different lineages involved in the parentage of the polyploids and confirmed their reticulate origin. Three of these lineages are closely related to the diploid species B. sterilis, B. tectorum, and B. fasciculatus. The fourth lineage could not be related to any diploid according to the available data. Our data gave insights on the origin of all the polyploids of section Genea, and chloroplast data allowed us to identify the maternal lineages. The Waxy gene was the most informative regarding origin of the polyploids. The Waxy copies duplicated by polyploidy appear selectively maintained in the polyploid species. No sequence heterogeneity was encountered in the ITS region, where concerted evolution seems to have occurred toward either maternal or paternal repeats. These results provide new information about the origin and molecular evolution of these polyploids and will allow a more accurate taxonomic treatment of the concerned species, based on their evolutionary history.

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