以陆地棉 (Gossypium hirsutum L.)中棉所 1 6和中棉所 2 9号为试验材料 ,用垂直板培养法试验结果表明 :40 0 mg· L-1 甲哌钅翁 (DPC)浸种处理显著促进棉花侧根发生 ,侧根原基发生量、发育速度和发生区长度都显著增加。去除侧根后 ,DPC增加侧根原基发生量和发育速度。在低温逆境情况下 ,DPC显著促进侧根发生 ,对增加抗低温能力有利。DPC处理提高了幼苗主根中部生长素、玉米素及其核苷含量 ,可能是诱导侧根发生的内在原因。 Taking Gossypium hirsutum L. CLC 16 and Zhongmian No.29 as test materials, the vertical plate culture method showed that the soaking treatment with 400 mg · L -1 DPC Significantly promote cotton lateral root, the amount of lateral root primordia, growth rate and the length of the occurrence area are significantly increased. After removing the lateral roots, DPC increased the amount of lateral root primordia and developmental speed. In the case of low temperature adversity, DPC significantly promote the generation of lateral roots, to increase anti-low temperature ability. DPC treatment increased the content of auxin, zeatin and nucleoside in the middle part of seedling root, which may be the intrinsic reason for inducing lateral roots.