
Keywords: 2,4-D, 2,4-dichlorophenoxyacetic acid; CPDs, cells in periclinal division; DAT, days after transfer of callus rhizoids to thidiazuron medium; PLB, protocorm-like body; PVE, pitted vessel element; QC, quiescent center; TDZ, thidiazuronMeristem; Parenchyma