生物活性物质提高玉米种子萌发及抗盐能力

通过发芽试验,对比分析单一施用和复合施用海藻酸、腐植酸钾、胺鲜酯和芸苔素内酯等生物活性物质对玉米种子萌发及抗盐能力的影响,并分析其适宜的浓度和配比。结果表明:随溶液中生物活性物质浓度的增加,玉米种子的萌发与根生长呈先上升后下降的趋势,最适浓度分别为胺鲜酯8～10 mg/L、芸苔素内酯0.50～1.00mg/L、海藻酸200～400mg/L、腐植酸钾10～15mg/L、芸苔素内酯与胺鲜酯复配液0.5～1.0mg/L和芸苔素内酯与腐殖酸钾复配液0.10～1.00mg/L。其中,复配后的芸苔素内酯与胺鲜脂对胚根的促生长作用最佳,复配后的芸苔素内酯与腐殖酸钾对胚轴生长的促进效果最佳。所有供试的生物活性物质均显著提高玉米种子的抗盐能力,其中效果最好的是芸苔素内酯。综上,施用适宜浓度的生物活性物质有助于促进玉米种子的萌发和根生长,不仅主根长度增加,而且侧根数量显著增多,从而提高其抗盐能力。

Optimum concentration of different bioactive substances to improve the germination and salt tolerance of maize seeds

In this study, the effects of single and combined bioactive substances(Seaweed extract, humic acid, diethyl aminoethyl hexanoate and brassinosteroid)with different concentrations on maize were compared by seed germination experiments. And their effects on improving the salt resistance were then analyzed. The results showed that: With the increasing of the bioactive substances concentration, the germination of maize seeds and seedling growth showed a trend of first increasing and then decreasing. The optimal concentration range were 8-10 mg/L diethyl aminoethyl hexanoate, 0. 50-1. 00 mg/L brassinosteroid, 200-400 mg/L seaweed extract, 10-15 mg/L Humic Acid, 0. 50-1. 00 mg/L brassinosteroid and diethyl aminoethyl hexanoate compound and 0. 10-1. 00 mg/L brassinosteroid and humic acid compound, respectively. Among them, the compound brassinosteroid and diethyl aminoethyl hexanoate had the best growth promoting effect on radicle, and the compound brassinosteroid and humic acid promoted the growth of hypocotyls best. All the tested bioactive substances could significantly improve the salt tolerance of maize seeds, of which brassinosteroid was the most effective one. In summary, the application of a suitable concentration of bioactive substances helps to promote the germination and root growth of maize seeds. Not only does the length of the main root increase, but the number of lateral roots also increases significantly, thereby improving its salt tolerance.