<正>６种植物激素（２，４－Ｄ、ＮＡＡ、ＩＡＡ、ＩＢＡ、６－ＢＡ、Ｓ．Ｌ．）用不同浓度处理杨树无性系ＮＬ－８０１０６组培苗根系，其中２，４－Ｄ、ＩＢＡ、Ｓ．Ｌ．有不同程度的诱瘤作用。以２，４－Ｄ和ＩＢＡ诱导结瘤最为稳定有效，２，４－Ｄ诱瘤的最适浓度１．０～１．５ｍｇ／Ｌ，ＩＢＡ为２．５～３．０ｍｇ／Ｌ。分离、回接和显微镜观察表明根瘤菌在诱瘤剂作用下已侵入诱导瘤。诱瘤剂在接种根瘤菌情况下对苗木生长有较为明显的促进作用，无论株高、鲜重和叶绿素含量都高于对照，尤以ＩＢＡ（３．０ｍｇ／Ｌ）最为显著。

When the roots of tissue culture seedlings of Poplar clone NL_80106 are treated with six plant hormones (2,4-D,NAA,IAA,IBA,6-BA,S.L.)in different concentrations, inducing nodulation is observed in seedlings treated with 2,4-D,IBA and S.L..2,4-D and IBA are the stablest and most effective. The suitable concentrations of 2,4-D and IBA are separately 1.01.5 mg/L and 2.53.0 mg/L in inducing nodulation. Isolation, reciprocal inculation and microscope observation indicate that inducement nodules have been intected by rhizobia. Inductors obviously promote growth of seedlings when inoculating rhizobium on seedlings. The height growth, fresh weight and chlorophyll content of tested seedlings exceed those of contrast seedlings, specially in IBA concentration of 3.0 mg/L.