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In PNAS, Molina et al. (1) argued for a single origin of cultivated rice based on a demographic analysis of SNPs detected from 630 genes on three rice chromosomes. Although hypotheses for both a single origin (snowballing model) and independent origins (combination model) of rice were previously proposed (2), Molina et al. (1) did not provide conclusive evidence to support the single-origin hypothesis. Molina et al. (1) used an inappropriate model for independent domestications (double-founder model), in which they assumed that indica and japonica cultivars originated from homogeneous ancestral populations that diverged for an interval between the two domestication events …

Inappropriate model rejects independent domestications of indica and japonica rice