[Inhibitory effect on Microcystis aeruginosa as well as separation and identification of the allelochemicals of welsh onion].
OBJECTIVE
To study the inhibition of welsh onion on Microcystis aeruginosa, and separat and identify of the allelochemicals from welsh onion. METHEDS: The inhibitory effect of different concentrations of fistular onion stalk and fistular onion leaf water extracts on M. aeruginosa were studied; besides, separation and identification of the allelochemicals of welsh onion were also studied.


RESULTS
Both fistular onion stalk and fistular onion leaf water extracts had, to different degree, inhibitory effect on the growth of M. aeruginosat. Compared with the control group, the fluorescence intensity of fistular onion stalk and fistular onion leaf were lower than the control group in the same period, and the inhibitory effect were more obvious with the increase of the water extract concentrations, to the fifth day, M. aeruginosa almost completely dead of the highest concentration(50 ml/L) of fistular onion stalk water extract treated group, the EC50 of water extract from fistular onion stalk to M. aeruginosa was 12.7 ml/L, equivalent to fresh weight 1.27 g/L. Main allelochemicals in fistular onion stalk includes allyl mercaptan, cyclopentyl mercaptan, and so on. The inhibiting assay on M. aeruginosa showed that the EC50 of allyl mercaptan and cyclopentyl mercaptan respectively were 0.03 and 0.02 g/L.


CONCLUSIONS
The fistular onion stalk water extracts has very good algicidal effect, allelopathic algal inhibiting substances primarily are sulfocompound, which have the potential to develop into biological algicide.
The Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu 241000, China. 1462991420@qq.com
Yang
Y
Zhou
The Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu 241000, China.
Yuan
Y
Li
The Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu 241000, China.
Cheng
C
Li
The Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu 241000, China.
Lu
L
Liu
The Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu 241000, China.
Tingting
T
Zhang
D046508:Culture Techniques; D046931:Microcystis / Q000187:drug effects* / Q000254:growth & development; D019697:Onions / Q000737:chemistry*; D010675:Pheromones / Q000032:analysis* / Q000494:pharmacology; D010936:Plant Extracts / Q000494:pharmacology*
D010675:Pheromones; D010936:Plant Extracts