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Studies on the Allelopathy of the Extract of Leek on Microcystis Aeruginosa

Author: LiuWenTao
Tutor: FengKe
School: Yangzhou University
Course: Plant Nutrition
Keywords: Chives Microcystis aeruginosa Allelopathy Biomass Ultrastructure
CLC: X52
Type: Master's thesis
Year: 2009
Downloads: 335
Quote: 7
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Abstract


Microcystis aeruginosa being spread around the world with the development of eutrophication, flooding. The seven peptide compounds generated by this single-celled cyanobacteria (microcystin), can cause human liver cancer, will also affect the normal growth of aquatic plants and animals, causing serious ecological imbalance. In recent years, the countries are very concerned about the governance of \Although already spend huge amounts of investment, a lot of research, but so far no breakthrough. Algae allelopathic role of research carried out in recent years, some scholars believe that the use of plant allelopathy may be an effective way to solve toxic algal blooms. Current study aquatic plants algae as the research object, few studies on terrestrial plants. The purpose of this study is to explore new ways by terrestrial plants algae allelopathy Combat microcystin. By screening, the test to determine the the leek water-soluble extracts of the high temperature treatment of Microcystis aeruginosa (FACHB-905) has the allelopathic inhibition was studied under different environmental conditions (pH, light intensity, whether aeration, the initial concentration of algae) the leek water-soluble extracts on the growth of Microcystis aeruginosa and its inhibition mechanism, leeks allelochemicals initial separation. Gave a qualitative description of leeks allelopathic the relationship between the substances in their environment, and how to use leeks allelopathic phenomenon applied to the eutrophication of lakes governance and ecological restoration recommendations. Specific conclusions are as follows: (1) preliminary experiments (different solvents on the allelochemicals algal effect), the results showed that: a single allelochemicals Microcystis aeruginosa inhibitory effect is not obvious, and the in allelochemicals role, solvent The kind and amount of plays an extremely important role. (2) leek extracts on the growth of Microcystis aeruginosa (FACHB-905) in rats showed that the the fresh chives water-soluble high temperature treatment significantly inhibited the presence of Microcystis aeruginosa. For 7d, the high temperature treatment of the fresh chives water-soluble extracts of Microcystis aeruginosa inhibition rate linearly with the logarithm of the concentration of the extracts of Microcystis aeruginosa semi-effect concentration EC50 of 0.808 g / L. Show that the leeks of Microcystis aeruginosa allelopathic inhibition good reproducibility can be obtained within a certain range. (3) leeks sense of the activity and concentration of the substance by the pH, light intensity, whether aeration, the initial concentration of algae fluctuations. Allelochemicals Microcystis aeruginosa inhibition of the combined effects of several factors in the culture system. This test, the role of allelochemicals best conditions the pH9.5 low illumination (1000Lx,) culture aeration process, the initial concentration of 106,107 ind / L under the conditions of the best inhibitory effect. (4) inhibition mechanism of experimental studies have shown that Microcystis aeruginosa ultrastructure the leek water-soluble extracts heat treatment not only destruction, also had an impact on all aspects of their physiology and biochemistry. Concrete manifestation of Microcystis aeruginosa cell growth significantly reduced algal chlorophyll a decreased membrane permeability increased, superoxide dismutase (SOD) activity and soluble protein content showed a trend first and then decreased, the membrane lipid peroxidation product malondialdehyde (MDA) accumulation and ultrastructure shows the degree of cell membrane damage consistent. (5) the leeks allelochemicals do a preliminary separation of the n-hexane phase algal best training cycle inhibition rate of more than 90% of the aqueous phase algal rate reached more than 80%. N-hexane and aqueous phases EC50 of 0.26mg / L and 0.81 mg / L. The algal component n-hexane was significantly better than has been reported allelochemicals has good application prospects.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control
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