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对不同群体条件下拔节前冬小麦主茎内源激素的变化进行了测定。结果表明，四种植物内源激素的含量存在着较大差异。脱落酸（ＡＢＡ）进入越冬期后明显提高，高密度高于低密度；赤霉素（ＧＡ３）在冬前不一致，除低密度处理含量处于较高水平外，冬后都呈下降趋势；细胞分裂素（Ｚ＋ＺＲ）高密度条件下冬前出现了高峰，而后逐渐接近；生长素（ＩＡＡ）在冬前分蘖期低密度含量较高，进入越冬期高密度较高，冬后不同密度都呈下降趋势，高密度含量显著高于低密度。同时也说明ＡＢＡ可能与小麦抗寒性有关，Ｚ＋ＺＲ和ＩＡＡ与分蘖的发生紧密相联。
Changes of endogenous hormones of main stems of winter wheat before jointing under different population conditions were determined. The results showed that the four plant endogenous hormone content there is a big difference. Abscisic acid (ABA) increased significantly after overwintering, and high density was higher than low density. GA3 was inconsistent before winter, except for low density treatment, (Z + ZR) peaked before winter, and then gradually approached. IAA had a higher content of low density at early tillering stage, a higher density at winter and a lower tendency at different densities after winter , High density content was significantly higher than the low density. It also shows that ABA may be related to the cold resistance of wheat, Z + ZR and IAA closely linked with the occurrence of tillering.