Fig. S1 Ratio of grain arsenic in different rice subpopulations grown under flooded and nonflooded conditions.

Fig. S2 Subpopulation variation in shoot arsenic concentration and arsenic transfer factor.

Fig. S3 Subpopulation variation in grain yield.

Fig. S4 Subpopulation variation in flowering time.

Fig. S5 Relationships between days to flowering and grain yield.

Fig. S6 Correlation between flowering times for the cultivars grown at the Arkansas field site in 2006 and 2007

Table S1 List of the six modern US rice cultivars and the 22 historical rice lines used to evaluate how breeding for modern cultivation has indirectly affected total arsenic (As) concentrations in brown grain

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