摘要
[目的]提高富营养化水体中的苦草沉水植物群的净化效率，避免修复后的苦草种群过度性生长。[方法]用0（CK）、50、100、150、200、250、300 mg／L的吲哚乙酸（IAA）溶液处理苦草种子24 h，研究种子的萌发率与后期幼苗的生长状况，以及0（CK）、0．01、0．02、0．10、0．20、0．50、0．75、1．00、1．25 g／L的矮壮素溶液对培育出的苦草矮化特征的影响。[结果]苦草种子的最大萌发率为58％。150 mg／L的IAA溶液处理24 h对苦草种子的萌发、幼苗株高的促进效果最好，而高浓度IAA（300 mg／L）对苦草种子萌发和幼苗株高有一定的抑制作用。不同浓度的矮壮素处理苦草后的矮化特征差异性明显（P＜0．05），其中0．02、0．10、0．20、0．50、0．75、1．00、1．25 g／L处理对苦草的矮化效果较好。矮壮素浓度为0．01～1．25 g／L时，苦草的叶宽、湿重增加明显（4．8％～118．0％）；在0．01～0．50 g／L时根冠比增加，但在0．70～1．25 g／L时减小。因此，矮壮素浓度在0．01～0．50 g／L时对苦草的矮化较适宜。[结论]该试验为苦草用于治理富营养化水体的水环境提供技术参考。
Abstract
Objective] To enhance the purification efficiency of Vallisneria spiralis in eutrophication water body, and to avoid the fast growth of submerged macrophyte.[Method] After using 0(CK), 50, 100, 150, 200, 250 and 300 mg/L IAA solutions to treat V.spiralis seeds for 24 h, the seed germination rate and seedling growth situation were researched.We also studied the effects of different concentrations (0, 0.01, 0.02, 0.10, 0.20, 0.50, 0.75, 1.00 and 1.25 g/L) of cycocel on the dwarfing characteristics of V.spiralis.[Result] The maximum germination rate of V.spiralis was 58%.Seed germination and seedling height was apparently accelerated after treated with 150 mg/L IAA for 24 h.However, 300 mg/L IAA showed certain inhibitory effects on seed germination and seedling height of V.spiralis.After treated with dif-ferent concentrations of cycocel, the plant height of V.spiralis showed significant differences(P<0.05).Among them, 0.02, 0.10, 0.20, 0.50, 0.75, 1.00 and 1.25 g/L cycocel treatments showed relatively good dwarfing effects.When cycocel concentration was between 0.01 and 1.25 g/L, leaf width and wet weight enhanced significantly (4.8%-118.0%).Root-shoot ratio enhanced in 0.01-0.50 g/L cycocel, but reduced in 0.70-1.25 g/L cycocel.Thus, 0.01-0.50 g/L cycocel was more suitable for V.spiralis dwarfing.[Conclusion] This research provides technical references for the application of V.spiralis in improving water environment with eutrophication water body.
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