A domestication history of dynamic adaptation and genomic deterioration in sorghum
| Autor: | Siva Samavedam, Alan Clapham, Oliver Smith, Guy C. Barker, Emma S. Mace, Pamela Rose, Dorian Q. Fuller, Chris J. Stevens, Logan Kistler, William V. Nicholson, Roselyn Ware, David Jordan, Robin G. Allaby |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Crops Agricultural 0106 biological sciences Introgression Plant Science Biology 010603 evolutionary biology 01 natural sciences Domestication 03 medical and health sciences Quantitative Trait Heritable SB History Ancient Sorghum Selection (genetic algorithm) 030304 developmental biology 2. Zero hunger 0303 health sciences Genetic diversity food and beverages 15. Life on land biology.organism_classification Adaptation Physiological 030104 developmental biology Evolutionary biology Mutation (genetic algorithm) Hybridization Genetic Local environment Adaptation Sweet sorghum 010606 plant biology & botany |
| ISSN: | 2055-0278 |
| Popis: | The evolution of domesticated cereals was a complex interaction of shifting selection pressures and repeated introgressions. 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 suggest a steady decline in genetic diversity over time coupled with an accumulating mutation load. Dynamic selection pressures acted sequentially on architectural and nutritional domestication traits, and adaptation to the local environment. Later introgression between sorghum races allowed 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 was not focused on the initial stages of domestication but occurred throughout the history of cultivation. |
| Databáze: | OpenAIRE |
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