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Cultures of petiole explants on regeneration medium containing 0.3 mg/L BA and 0.01 mg/L NAA. (a), For 40 days without subculture; (b), For 40 days after being cultured on a medium containing 0.3 mg/L BA, 0.01 mg/L NAA and 120 mg/L colchicine for 30 days.
