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The effect of melatonin on the NO accumulation in roots of polyamine- and NO-deficient Arabidopsis plants. Seven-day-old seedlings were treated with or without 5 μM melatonin in the presence or absence of 50 μM Fe for 8 days. Then, NO-associated fluorescence was detected in the roots of polyamine-deficient (adc2-1 and d-arg-treated) (A) and NO-deficient (nia1nia2noa1 and c-PTIO-treated) plants (B).
