Genotypic variation in biomass allocation in response to field drought has a greater affect on yield than gas exchange or phenology.

For most allocation traits (above-ground biomass, below-ground biomass, root:shoot ratio, and fruit production), estimates of r GE were significantly different than both 0 and 1 (that is, both genotype and G × E effects were highly significant; Table 3 ), indicating that different loci affected the trait across treatment pairs and/or that some alleles had different functional effects across treatments.

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