Fig. 1

Callus ofAcer rubrumL.explants in different periodsa: Cultured 15 d, In the incision site and lenticel, explants produce I, II callus;b:培养30 d,外植体lluses were III and IV callus;c: Cultured 30 d, the stem section with a bud V, VI, VII and mixed type VII callus;d: Leaf explant culture for 25 d, IX and X calluses