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Effect of 5-aminolevulinic acid on growth characteristics, photosynthetic pigments and phenolics in two sunflower cultivars under water deficit stress (n = 6; means ± SE). ALA 5-aminolevulinic acid, ns non-significant. Mean sum of squares of ANOVA with significance at P ≤ 0.05 (*); P ≤ 0.01 (**); P ≤ 0.001 (***)
