The result of study on effect of sugar and inorganic nitrogen to rooting of elm tip in tissue culture showed that rooting rate of new tip was higher in higher sugar level medium than in lower sugar level medium.

• 研究糖和无机氮源对白榆组培新梢不定根形成的影响 ,结果表明 ,含有高浓度蔗糖的培养基比低浓度蔗糖的培养基新梢生根率高。