Open AccessChloroplastic and nuclear diversity of wild beets at a large geographical scale: Insights into the evolutionary history of the Beta section
Author(s) -
Touzet Pascal,
Villain Sarah,
Buret Laetitia,
Martin Hélène,
Holl AnneCatherine,
Poux Céline,
Cuguen Joël
Publication year - 2018
Publication title -
ecology and evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.17
H-Index - 63
ISSN - 2045-7758
DOI - 10.1002/ece3.3774
Subject(s) - subspecies , biology , genetic diversity , phylogenetic tree , ploidy , mating , beta diversity , beta (programming language) , nuclear gene , evolutionary biology , botany , ecology , biodiversity , genetics , population , gene , genome , demography , sociology , computer science , programming language
Historical demographic processes and mating systems are believed to be major factors in the shaping of the intraspecies genetic diversity of plants. Among Caryophyllales, the Beta section of the genus Beta, within the Amaranthaceae/Chenopodiaceae alliance, is an interesting study model with species and subspecies ( Beta macrocarpa , Beta patula , Beta vulgaris maritima and B.v. adanensis) differing in geographical distribution and mating system. In addition, one of the species, B. macrocarpa , mainly diploid, varies in its level of ploidy with a tetraploid cytotype described in the Canary Islands and in Portugal. In this study, we analyzed the nucleotide diversity of chloroplastic and nuclear sequences on a representative sampling of species and subspecies of the Beta section (except B. patula ). Our objectives were (1) to assess their genetic relationships through phylogenetic and multivariate analyses, (2) relate their genetic diversity to their mating system, and (3) reconsider the ploidy status and the origin of the Canarian Beta macrocarpa .