Rice (Oryza sativa) is one of the world’s most important food crops, and is comprised largely of japonica and indica subspecies. Here, we reconstruct the history of rice dispersal in Asia using whole-genome sequences of more than 1,400 landraces, coupled with geographic, environmental, archaeobotanical and paleoclimate data. Originating around 9,000 yr ago in the Yangtze Valley, rice diversified into temperate and tropical japonica rice during a global cooling event about 4,200 yr ago. Soon after, tropical japonica rice reached Southeast Asia, where it rapidly diversified, starting about 2,500 yr bp. The history of indica rice dispersal appears more complicated, moving into China around 2,000 yr bp. We also identify extrinsic factors that influence genome diversity, with temperature being a leading abiotic factor. Reconstructing the dispersal history of rice and its climatic correlates may help identify genetic adaptations associated with the spread of a key domesticated species.
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We thank our colleagues for helpful discussions on this project. This work was supported in part by Zegar Family Foundation grant A16-0051-004 and US National Science Foundation Plant Genome Research Program grant IOS-1546218 to M.D.P., Portugal Fundação para a Ciência e a Tecnologia grant EXPL/BIA-BIC/0947/2012 to S.N., SFRH/BD/68835/2010 to I.S.P. and UID/Multi/04551/2013 to M.M.O., Gordon and Betty Moore Foundation and Life Sciences Research Foundation grant GBMF2550.06 to S.C.G., US National Science Foundation grant PRFB 1711950 to E.S.B., Natural Environment Research Council UK grant NE/N010957/1 to C.C.C. and D.Q.F., US National Science Foundation grant BCS-1632207 to J.A.d.G. and United States Department of Agriculture and National Institute of Food and Agriculture grant 2019-67009-29006 to J.R.L.
The authors declare no competing interests.
Peer review information Nature Plants thanks Laura Botigué and Angé́lica Cibrián-Jaramillo and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Supplementary Figs. 1–24.
Spatio-temporal distribution of rice thermal niche. Video illustrating the probability of rice being in niche based on the minimum and maximum growing degree days requirement for tropical japonica landraces. Map of Asia with plotted thermal niche probabilities, colour-coded as indicated below the map. White lines denote the border under which niche probability drops below 75%. Below the map is a plot of probabilities averaged across spatial scale. The thick black line represents mean, thin lines show interquartile range, and grey shaded area represents 25% to 75% probability of being in the thermal niche (n = 477,708 cells). The thin black lines are the mean probabilities of being in the thermal niche across the study area when modelled using the 1σ uncertainty intervals as provided by the Northern Hemisphere temperature reconstruction (n = 73 datasets)40. Moving vertical red line indicates time before present.
Supplementary Tables 1–3.
Geographic coordinates, migration data, statistical data and Canonical coordinates.
Dimension (MDS) coordinates, country codes and graph dot format.
Statistical data points, geographic coordinates, graph trajectories, statistical data and raster data.
Geographic coordinates and statistical data.
Geographic coordinates and statistical data.
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Gutaker, R.M., Groen, S.C., Bellis, E.S. et al. Genomic history and ecology of the geographic spread of rice. Nat. Plants 6, 492–502 (2020). https://doi.org/10.1038/s41477-020-0659-6
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