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Allelopathy of aqueous extract of cattail onMicrocystis aeruginosa.

DONG Yin-na1,  FENG Bin2, WANG Bing-xuan2, GUO Ming1,3*, FAN Xiao-yue2   

  1. (1School of Agricultural and Food Science, Zhejiang A&F University, Lin’an 311300, Zhejiang, China; 2 School of LandscapeArchitecture and Architecture, Zhejiang A&F University, Lin’an 311300, Zhejiang, China; 3School of Science, Zhejiang A&F University, Lin’an 311300, Zhejiang, China).
  • Online:2018-02-10 Published:2018-02-10

Abstract: The components with high allelopathic activity were separated fromTypha orientalis aqueous extract by liquidliquid partition and thinlayer chromatography. The components with high allelopathic activity were analyzed by gas chromatographmass spectrometry (GC/MS) toexamine the allelopathic effects of aqueous extract from different tissues ofT. orientalis onMicrocystis aeruginosa. The results showed that the inhibitory effects of different T. orientalis tissues were different, with the inhibitory effect of leaf extract > root extract > pollen extract. The inhibition rate of leaf extract onM. aeruginosa was up to 72.35%. The allelopathic effects of T. orientalis leaf aqueous extract onM. aeruginosa exhibited a phenomenon of inhibition at highconcentration (≥10 g·L-1) while showed a trend of stimulation at low (≤5 g·L-1). The allelopathic effects decreased the content of chlorophyll a, increased permeability of cellmembrane while initially increased then decreased SOD activity and MDA content. Results of GC-MS showed that the main allelochemicals from T. orientalis were phenolic acid, fatty acid, ester, ketone, amide, and so on. The results provide a theoretical guidance for the management ofaquatic ecosystems with algal blooms.

Key words: agricultural runoff, removal mechanism, pesticide, removal efficiency, influencing factor, constructed wetland