DArT whole genome profiling and evolution of edible banana

Edible banana varieties underwent a series of bottlenecks during their evolution and domestication, resulting in a number of original genotypes that diversified clonally. Sardos et al. have genotyped more than 500 cultivated bananas and wild relatives using DArT markers.

Results obtained from STRUCTURE for the analysis of the full wild sample (94 individuals)
Results obtained from STRUCTURE for the analysis of the full wild sample (94 individuals) (A) Median Ln(K) and median ΔK (Evanno et al., 2005). (B) Partitioning of the individuals according to their membership coefficient Q across the K groups for K = 2, 3, 4 and 8. Cluster I is composed of 27 M. acuminata banksii; cluster II of six M. acuminata burmannica/burmannicoïdes; cluster III of one M. acuminata errans and three M. acuminata qualified as hybrids; cluster IV of 13 M. acuminata malaccensis; cluster V of two M. acuminata microcarpa; cluster VI of one accession qualified as hybrid, of two M. acuminata siamea, of one M. acuminata truncata and one M. acuminata without known subspecies; cluster VII of seven M. acuminata zebrina; cluster VIII of hybrids between M. acuminata and M. schizocarpa; cluster IX of 11 M. balbisiana; and cluster X of 11 M. schizocarpa.

They identified two main genetic clusters in the cultivated genepool of edible diploids that question the occurrence of two key centres of domestication, in New-Guinea and south-east Asia. Polyclonal subgroups were also identified, further highlighting evolutionary differences in the emergence of current edible banana cultivars.

Reference List

Sardos, J., Perrier, X., Doležel, J., Hřibová, E., Christelová, P., Van den houwe, I., Killian, A., Roux, N. (2016). DArT whole genome profiling provides insights on the evolution and taxonomy of edible Banana (Musa spp.). Annals of Botany, 118(7), 1269–1278. https://doi.org/10.1093/aob/mcw170