Fig. 3From: Exogenous melatonin improves the salt tolerance of cotton by removing active oxygen and protecting photosynthetic organsEffects of exogenous melatonin treatment on proline content of cotton seedlings under salt stress. Control (CK) and salt-treated (S) plants were sprayed with distilled water, while S + MT50, S + MT100, S + MT200, and S + MT500 plants were sprayed with 50, 100, 200, and 500 μM MT, respectively. Different lowercase letters indicate significant differences at the p ≤ 0.05 levelBack to article page