为了明确低温条件下30%噻虫嗪悬浮种衣剂不同剂量对春小麦生长的安全性及对生理生化指标的影响，以其不同剂量包衣的春小麦为研究对象，测定了低温胁迫下春小麦株高、根长、地上鲜重、地下鲜重及叶片中叶绿素、可溶性糖、丙二醛含量的变化。结果表明，100 kg春小麦种子用30%噻虫嗪悬浮种衣剂50 g包衣，在昼/夜温度为20 ℃/10 ℃、15 ℃/5 ℃条件下，能增加春小麦的株高和地上鲜重。但当胁迫温度降低、包衣剂用量增加时，春小麦的生长、叶绿素含量及可溶性糖的生成受到抑制，丙二醛的含量增加，且随着温度越低包衣浓度越大，抑制作用越明显，春小麦受到的伤害也越严重。用新烟碱类噻虫嗪悬浮种衣剂包衣后，在春季播种时，以推荐剂量的低剂量包衣种子为宜。

In order to indicate the safety of 30% thiamethoxazine seed-coating suspension agent with different doses to spring wheat and the effect of photosynthetic and biochemical indexes of spring wheat seedling under chilling stress. Spring wheat coated with different concentrations as study objects， the changes of plant height， root length， upper fresh weight， root fresh weight， and the contents of chlorophyll， soluble sugar and malondialdehyde in leaves of spring wheat under chilling stress were measured. The results showed that the plant height and upper fresh weight of spring wheat could be increased by coating 100 kg seeds with 30% thiamethoxazine seed-coating suspension agent 50 g at 20 ℃/10 ℃ and 15 ℃/5 ℃. However， when the stress temperatures decreased and the doses of thiamethoxam seed-coating increased，the growth of wheat，the content of chlorophyll and soluble sugar in wheat leaves were inhibited， and the content of MDA in wheat leaves increased，and the lower temperatures and the greater coating concentrations， the more obvious the inhibition， and the more serious the injury to spring wheat. Therefore， spring wheat coated with 30% thiamethoxazine seed-coating suspension agent should be coated at low recommended dosage when sowing in spring.

S512.1；S351.1

公益性行业(农业)科研专项经费项目(201503125-06)；甘肃省农业科学院科研条件建设及成果转化项目(2017GAAS24)；甘肃省农业科学院农业科技创新专项(2012GAAS07-1)资助。