在霍格兰营养液中分别设置6个不同浓度(0、0.1、0.2、0.4、0.8、1.6 mg·L−1)处理的植物生长调节剂吲哚丁酸(IBA),研究其对烟苗生物量的影响。结果表明,随着吲哚丁酸浓度的变化,烟草幼苗根干重、地上部干重、壮苗指数的变化一致呈现先上升后下降的趋势。在处理烟苗时,使用0.8 mg/L和1.6 mg/L的高浓度吲哚丁酸均导致了烟苗生物量的减少,其他浓度的吲哚丁酸处理相较于对照组,均促进了烟苗生物量的增长。当吲哚丁酸的浓度为0.4 mg/L时,其对烟苗生物量的提升效果最为显著。0.4 mg/L吲哚丁酸处理较其他处理提升了生物量,根系干重、地上部干重、壮苗指数,增长幅度分别达到6.94%~97.44%、5.27%~73.91%、6.25%~109.96%。综合试验条件下0.4 mg/L的吲哚丁酸浓度为烟草漂浮育苗营养液的最佳浓度。The plant growth regulator indolebutyric acid (IBA) was treated with 6 different concentrations (0, 0.1, 0.2, 0.4, 0.8, 1.6 mg·L−1) in Hoagland nutrient solution to study the effects of IBA on the biomass of tobacco seedlings. The results showed that with the increase of indolebutyric acid concentration, the changes of root dry weight, above-ground dry weight and strong seedling index of tobacco seedlings were consistent, and increased first and then decreased with the change of concentration. Both 0.8 mg/L and 1.6 mg/L high concentration indolebutyric acid treatments reduced the biomass of tobacco seedlings, and other indolebutyric acid treatments increased the biomass of tobacco seedlings compared with the control, among which 0.4 mg /L indolebutyric acid treatment had the most significant increase effect. Compared with other treatments, 0.4 mg/L indobutyric acid treatment increased the biomass, root dry weight, above-ground dry weight and seedling strength index by 6.94%~97.44%, 5.27%~73.91% and 6.25%~109.96%, respectively. Under the comprehensive test conditions, indolebutyric acid concentration of 0.4 mg/L was the best concentra
将6种不同浓度(0、0.1、0.2、0.4、0.8、1.6 mg/L)的植物生长调节剂吲哚丁酸(IBA)添加至霍格兰营养液中,研究其对烟草幼苗叶部保护性酶活性及丙二醛含量的影响。结果表明,烟草幼苗叶部保护性酶活性和丙二醛含量与 IBA 浓度有着密切的关系。综合来说,烟苗保护性酶活性趋势起初增强而后减弱,而丙二醛含量则与之相反,趋势为先下降而后上升。0.4 mg/L处理较其他处理显著提升了烟草幼苗叶部保护性酶活性,增幅达27.36%~35.44%。而1.6 mg/L处理较对照处理显著减弱了烟苗幼苗叶部保护性性酶活性。0.4 mg/L处理较其他处理减少了烟草幼苗叶部丙二醛的含量达到最低值。而1.6 mg/L吲哚丁酸处理较对照处理增加了烟苗幼苗叶部丙二醛含量,增幅达20.95%。0.4 mg/L吲哚丁酸处理提高了烟苗幼苗叶部保护性酶活性,降低了MDA含量。本试验表明,当烟草漂浮育苗营养液中吲哚丁酸浓度为0.4 mg/L时,可起到促进烟草幼苗叶部发育的作用。The effects of plant growth regulator indolebutyric acid (IBA) at different concentrations (0, 0.1, 0.2, 0.4, 0.8, 1.6 mg/L) on the activity of protective enzyme and the content of malondialdehyde in leaves of tobacco seedlings were studied. The results showed that there was a close relationship between the activity of protective enzyme and the content of malondialdehyde and the concentration of IBA. In general, the protective enzyme activity of tobacco seedlings increased at first and then decreased, while the malondialdehyde content decreased first and then increased. Compared with other treatments, 0.4 mg/L treatment significantly increased the activity of protective enzyme in leaves of tobacco seedlings by 27.36%~35.44%. Compared with the control treatment, 1.6 mg/L treatment significantly decreased the activity of protective enzyme in the leaves of tobacco seedlings. Compared with other treatments, 0.4 mg/L reduced the content of malondialdehyde in leaves of tobac
