A domestication history of dynamic adaptation and genomic deterioration in Sorghum.
Nat Plants
; 5(4): 369-379, 2019 04.
Article
en En
| MEDLINE
| ID: mdl-30962527
The evolution of domesticated cereals was a complex interaction of shifting selection pressures and repeated episodes of introgression. Genomes of archaeological crops have the potential to reveal these dynamics without being obscured by recent breeding or introgression. We report a temporal series of archaeogenomes of the crop sorghum (Sorghum bicolor) from a single locality in Egyptian Nubia. These data indicate no evidence for the effects of a domestication bottleneck, but instead reveal a steady decline in genetic diversity over time coupled with an accumulating mutation load. Dynamic selection pressures acted sequentially to shape architectural and nutritional domestication traits and to facilitate adaptation to the local environment. Later introgression between sorghum races allowed the exchange of adaptive traits and achieved mutual genomic rescue through an ameliorated mutation load. These results reveal a model of domestication in which genomic adaptation and deterioration were not focused on the initial stages of domestication but occurred throughout the history of cultivation.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Sorghum
/
Domesticación
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Nat Plants
Año:
2019
Tipo del documento:
Article