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Effect of melatonin foliar application on growth characteristics [plant height (a), shoot fresh weight (b), shoot dry weight (c), root length (d), root fresh weight (e) and root dry weight (f)] of Dracocephalum moldavica under different levels of drought stress. The mean comparisons were performed using LSD method at p ≤ 0.05 significant level. Means (± SE) followed by the same letter(s) are not significantly different
