AI Article Synopsis
- The study investigates the origins of domesticated Asian rice (Oryza sativa), suggesting that it likely arose from multiple domestication events, particularly from wild progenitors O. rufipogon and O. nivara.
- First domesticated rice, O. sativa ssp. japonica, split off from O. rufipogon approximately 13.1-24.1 thousand years ago, which aligns with both genetic and archaeological evidence of early rice management in China.
- Significant gene flow occurred from japonica to indica (about 17%) and aus (about 15%), indicating that while different subspecies had their origins, the domestication process primarily took place in japonica, with subsequent
Article Abstract
The origin of domesticated Asian rice (Oryza sativa) has been a contentious topic, with conflicting evidence for either single or multiple domestication of this key crop species. We examined the evolutionary history of domesticated rice by analyzing de novo assembled genomes from domesticated rice and its wild progenitors. Our results indicate multiple origins, where each domesticated rice subpopulation (japonica, indica, and aus) arose separately from progenitor O. rufipogon and/or O. nivara. Coalescence-based modeling of demographic parameters estimate that the first domesticated rice population to split off from O. rufipogon was O. sativa ssp. japonica, occurring at ∼13.1-24.1 ka, which is an order of magnitude older then the earliest archeological date of domestication. This date is consistent, however, with the expansion of O. rufipogon populations after the Last Glacial Maximum ∼18 ka and archeological evidence for early wild rice management in China. We also show that there is significant gene flow from japonica to both indica (∼17%) and aus (∼15%), which led to the transfer of domestication alleles from early-domesticated japonica to proto-indica and proto-aus populations. Our results provide support for a model in which different rice subspecies had separate origins, but that de novo domestication occurred only once, in O. sativa ssp. japonica, and introgressive hybridization from early japonica to proto-indica and proto-aus led to domesticated indica and aus rice.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5400379 | PMC |
| http://dx.doi.org/10.1093/molbev/msx049 | DOI Listing |
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