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Determination of the optimal streptomycin concentration for inhibition of callus growth and shoot induction. The growth response of the total calli (2–3 weeks after germination) on selective regeneration medium containing (A) 0 (left), 100 (middle) and 200 (right) mg/L of streptomycin, after 2 months of culture in the light condition, and (B) 0 (left), 500 (middle) and 1,000 (right) mg/L of streptomycin, after 1 month of culture in the dark condition.
