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Exogenous supplementation of melatonin promoted root morphology [Root length (A), root volume (B), surface area (C), root crossings (D), root tips (E), root forks (F), average diameter (G), and projected area (H)] of tomato seedlings under drought stress conditions. Means ± standard error, n = 3, significant difference are exhibited by lowercase letters (p ≤ 0.05), according to LSD test.
