The exogenous auxin and cytokinin are necessary to induced differentiation and proliferation of cells of culture in vitro.2,4-D is an important hormone of induced embryogenic calluses.

• 外源生长素和细胞分裂素是诱导离体培养细胞分化与增殖所必需的,2,4-D是诱导胚性愈伤组织的重要激素。