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Under drought conditions, exogenous melatonin promoted the increase in proline and soluble sugar content in sorghum leaves: (A) free proline content; (B) soluble sugar content. CK: control treatment; D: 20% PEG; D + M: 20% PEG + 100 μmol/L of MT; D + P: 20% PEG + 100 μmol/L of CPA; columns represent mean ± SD, and, according to the LSD test, n = 3, significant differences are indicated in lower case letters (p ≤ 0.05).
