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Dear Editor,The plant hormone indole-3-acetic acid (IAA) has long been used in plant culture media for practical applications and scientific inquiries.The use of IAA is complicated by the fact that IAA is a photo-labile compound.In Murashige and Skoog (MS) plant media (Murashige and Skoog,1962),the concentrations of salts and mineral nutrients are known to hasten the photodegradation of IAA under white light (Dunlap and Robacker,1988).