Synergistic effects of acid rain and (±)-2-(2,4-Dichlorophenoxy)-Propanoic acid (2,4-DP) on growth, mineral content and stress-induced ethylene in lettuce

Add time:07/29/2019    Source:sciencedirect.com

Lettuce grown hydroponically in growth chambers was exposed daily for 10 days to simulated acid rain at pH 3·3, 4·1 and 5·6 with and without 1·5 mg litre−1 2,4-DP. Increasing acidity reduced contents of Mn, Fe, Mg and Co, increased visible damage, but did not affect yield. Growth was stimulated by 2,4-DP at pH 4·1 and 5·6 but inhibited at pH 3·3. Contents of Zn and Co, as well as visible damage, were affected in a similar synergistic way. Contents of stress-ethylene 8 and 18 h after exposure indicated that the mode of action for synergism may be due to the pH-pKa-dependent cuticular penetration.

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