光合细菌对铜绿微囊藻生长的抑制效应

为了探讨光合细菌对水华藻类的控制作用,在实验室条件下,通过菌藻共同培养,研究了沼泽红假单孢菌(Rhodopseudomonas palustras)、球形红细菌(Rhodobacter sphaeroides)及其混合培养物对铜绿微囊藻(Microcystis aeruginosa)生长的抑制效应.实验结果表明,光合细菌混合培养物对铜绿微囊藻抑藻作用最强,培养5 d时,铜绿微囊藻生物量降低率达58.9%,培养时间、培养温度、菌体投加量及培养基pH值等对光合细菌混合培养物的抑藻作用均有不同程度的影响.光合细菌混合培养物发挥抑藻作用的适宜条件为培养温度25℃,培养时间≤5 d,光合细菌投加量(V_(光合细菌菌悬液):V_(藻培养液)=1:80),藻培养基pH为8.0左右.

Inhibiting effect of photosynthetic bacteria on Microcystis aeruginosa

Microcystis aeruginosa Kuetzing is a widespread bloom alga. The inhibiting effects of Rhodopseudomonas palustras, Rhodobacter sphaeroides and their mixed culture on M. Aeruginosa were investigated through the cell liquid culture system. The results indicated that the mixed culture can have remarkable alga-inhibiting action against M. Aeruginosa by decreasing average per-cent of algae biomass to 58.9% when they were cultured 5 d jointly. Some factors such as culturing temperature, culturing time, cast-ing quantity of PSB and pH of culture medium can all impact the controlling effect in different degree. The inhibiting effect was best under culturing temperature at 25 ℃, culturing time ≤5 d, PSB casting quantity about 1/80 and pH of culture medium about 8.0.