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Inappropriate model rejects independent domestications of indica and japonica rice

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.