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通过室内沙培试验,研究吡虫啉和种子不同药种比例拌种处理对玉米种子萌发及幼苗生长的影响。结果表明,28℃条件下,6种拌种处理玉米种子萌发和幼苗生长均为安全,药种比为5∶10 000处理对玉米幼苗作用效果显著,与对照(未拌种)处理相比,玉米幼苗株高、初生根长、次生根数、叶片数、第1真叶面积、单株鲜重、单株干重、根冠比和叶绿素含量分别增加了1.18 cm、2.85 cm、0.35条、0.28片、0.74 cm2、0.41 g、0.055 g、0.220和11.1%。种子活力结果表明,5∶10 000处理玉米种子发芽势、发芽率、发芽指数和活力指数与对照处理相比分别提高了38.9%、6.4%、27.6%和76.2%。各药剂处理玉米种子萌发过程中α-淀粉酶的变化规律相似,7 d时药种比高的处理玉米种子α-淀粉酶活性仍保持较高活性,药种比低的处理和对照均有所下降。各药剂处理可溶性还原糖含量均随发芽天数的增加而增大,第7天均有所降低,但种子拌种处理后仍保持较高含量。
The indoor sand culture test was conducted to study the effects of different seed dressing treatments of imidacloprid and seed on the seed germination and seedling growth of maize. The results showed that seed germination and seedling growth of maize were safe under the treatment of 28 ℃, and the effect of 5:10 000 to maize seedling was significant. Compared with the control (without dressing) The plant height, primary root length, secondary root number, leaf number, first true leaf area, fresh weight per plant, dry weight per plant, root / shoot ratio and chlorophyll content increased by 1.18 cm, 2.85 cm and 0.35, 0.28 tablet, 0.74 cm2, 0.41 g, 0.055 g, 0.220 and 11.1%. Seed vigor results showed that the germination potential, germination rate, germination index and vigor index of 5:10 000 maize seeds increased by 38.9%, 6.4%, 27.6% and 76.2% respectively compared with the control. The changes of α-amylase during the germination of maize seeds were similar, and the activity of α-amylase in maize seeds remained high at 7 days. decline. The contents of soluble reducing sugars in all the treatments increased with the increase of germination days and decreased at the 7th day. However, the content of soluble reducing sugars remained high after seed treatment.