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ABA concentration in mesocotyl (A) and leaf blade (B) of the B73 wild type and phyB1 phyB2 double mutants grown under two different temperature regimes. All seedling tissues were harvested at the beginning of the photoperiod (dawn) at 10 d (28°C constant) or 15 d (10°C dark chill) after planting. Each measurement consists of the mean ± se derived from three biological replicates (each from a pool of eight seedlings). FW, Fresh weight.
