RESUMEN
<p><b>OBJECTIVE</b>To study the optimal condition for bulb induction of Fritillaria anhuiensis in vitro.</p><p><b>METHOD</b>Effects of sucrose, salicylic acid, active carbon and 5 degrees C pre-incubation on bulb formation in vitro were investigated by adopting the number of bulb and fresh weight as indexes.</p><p><b>RESULT</b>The number of bulb and fresh weight in medium added with 50 g x L(-1) sucrose were significantly higher than those with other treatments. The medium with different concentrations of salicylic acid showed no significant promotion on callus differentiation. However, 5 g x L(-1) active carbon (AC) treatment was better than other treatments. Meanwhile, a large number of plantlets formed after 5 degrees C pre-incubation for 30-40 days was suitable for bulb formation and growth.</p><p><b>CONCLUSION</b>Bulblet formation was optimal in MS + KT 2 mg x L(-1) + NAA 2 mg x L(-1) + 50 g x L(-1) sucrose +5 g x L(-1) AC after callus pre-incucation at 5 degrees 1 for 30-40 days.</p>