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ABA concentration and related-gene expression under long-term low-B stress. BnNCED3, ABA biosynthesis-related gene; BnPYL4, ABA sensor gene. Plants were grown hydroponically under sufficient B (+B, 25 μM B) or low-B (−B, 0.25 μM B) for 20 days. L, leaves; A, shoot apex; C, root crown; R, root. Values represent the mean ± SD of four independent replicates, and bars with different letters show significant differences for the same organ among the treatments (ANOVA, LSD, p < 0.05).
