Concentrations-dependent effect of exogenous abscisic acid on photosynthesis, growth and phenolic content of Dracocephalum moldavica L. under drought stress.

ABA application showed a decreasing trend in photosynthesis rate and mentioned plant growth parameters under all moisture regimes.

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There was an increasing trend in total phenolic content with increasing in ABA concentration up to 20 μM in the plant grown well-watered and severe drought conditions and then it remained almost stable up to 40 μM ABA (Fig. 13 ).

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