水生观赏植物红掌对铜绿微囊藻的化感作用

为研究红掌根部浸提液和红掌种植水对铜绿微囊藻生长的化感抑制作用,考察了红掌根添加量(以ρ计)分别为0、0.5、1.0、2.0、3.0、4.0 g/L及红掌种植水对铜绿微囊藻生长的抑制作用,同时研究了不同红掌根添加量下铜绿微囊藻的光合作用指标及生理活性指标的变化. 结果表明,红掌根部浸提液能有效抑制铜绿微囊藻的生长,在红掌根添加量(3.0、4.0 g/L)较高时,对铜绿微囊藻的抑制率超过90%. 藻类的光合活性也受到极大的损伤,具体表现为最大光量子产量和有效光量子产量的降低,最大相对电子传递速率的降低等. 铜绿微囊藻细胞内的酶系统工作也受到抑制,细胞膜和细胞器膜受自由基严重攻击,细胞受损伤程度较大,具体表现为MDA(丙二醛)的快速积累和POD(过氧化物酶)活性的急剧降低. 随着红掌根添加量的升高,其对铜绿微囊藻生长的化感抑制效果显著加强. 与对照组相比,高红掌根添加量组(3.0、4.0 g/L)的光量子产量降低了0.3,c(MDA)升高了10 nmol/mL以上,POD活性降低了3 U/mg. 试验第18天时,对照组、0.5、1.0、2.0、3.0、4.0 g/L红掌根添加组ρ(Chla)分别为515.80、396.35、246.44、160.50、3.67和4.13 μg/L. 红掌种植水对于铜绿微囊藻的生长具有抑制作用,其抑制效果差于高红掌根添加量试验组的抑制效果. 

Allelopathic Effects of Anthurium on Cyanobacterium Microcystis aeruginosa

Allelopathic inhibitory effects of different amounts of root and planting water of Anthurium on Microcystis aeruginosa were comparatively studied. The results showed that large amounts (3.0 and 4.0 g/L) of Anthurium root could effectively inhibit the growth of M. aeruginosa, with inhibition rates over than 90%. The photosynthetic activity of M. aeruginosa was greatly affected. The Φmax, Φ and ETR were reduced compared to the control group. The enzyme system of M. aeruginosa cells was also inhibited after the treatments. The cell membranes and organelles membranes were attacked by free radicals seriously. MDA accumulated rapidly and POD was reduced drastically. The inhibition rates increased along with the increase of root amounts. Compared with the control group, the light quantum yield of the experimental groups with high amounts of Anthurium root was reduced by 0.3, yet c(MDA) increased over 10 nmol/mL and activities of POD decreased nearly 3 U/mg. At the end of the 18th day of the experiment, the ρ(Chla) of the control group and the 0.5,1.0,2.0,3.0,4.0 g/L root treated groups were 515.80,6.35,6.44,0.50,3.67 and 4.13 μg/L respectively. The planting water of Anthurium could inhibit the growth of M. aeruginosa, but the inhibitory effect was worse than that of root with high amounts.