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The effects of pre-sowing He-Ne laser seed treatment on pigmentation in sunflowers. For each trait, means with the same letters do not differ significantly from each other at P ≤ 0.05. Data are presented as mean ± standard deviation (n = 3 independent biological replicates). (A) Chlorophyll a, (B) Chlorophyll b, (C) Total chlorophyll (a + b), (D) Chlorophyll a/b ratio. Statistical significant differences determined by LSD (P < 0.05) are denoted by a, b, c.
