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Effects of lead (Pb, 150 and 300 µM) alone or in combination with methyl jasmonate (MJ, 0.5 and 1 μM) on the activity of proline dehydrogenase (PDH, A), 1-pyrroline-5-carboxylate synthetase (P5CS, B), chlorophyllase (Chlase, C) and δ-aminolevulinic acid dehydratase (δ-ALAD, D) in rice leaves. Values (means ± SD, n = 5) followed by the same letter are not significantly different (P < 0.05; LSD test)
