Figure 10 - from "Allelopathically inhibitory effects of eucalyptus extracts on the growth of Microcystis aeruginosa"

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Fig. 8. Fluorescence EEM spectra for M. aeruginosa after 1 and 5 days of treatment by different ELE dosage. Three dimensional EEM fluorescence spectra of M. aeruginosa after 1 and 5 days of treatment by varying ELE dosage (0, 100, and 300 mgL~') are shown in Fig. 8. EEM fluorescence spectra of M. aeruginosa after 1 day of treatment mainly reflect the peaks On the other ELE, the EEM peaks located belonging to protein-like substances (e.g., trypto ocated near the excitation/emission wavelength o hand, it was found that after 5 days of treatment by fluorescence spectrum of M. aeruginosa appeared to be similar to the control and therefore exhibited pea protein-like substances. When ELE dosage was 100 the EEM fluorescence spectra of M. aeruginosa exhibited mainly the near the excitation/emission wave phan, tyrosine f 280/310 nm). ks attributed to or 300 mgL“!, ength of 350/ 450nm range, which may be associated with humic-like sub- stances. Based on these findings, one can deduce that the 100 and 300 mg L"! ELE dosage to the culture containing M. aeruginosa not

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Microcystis aeruginosa (M. aeruginosa), as the dominant algae in eutrophic water bodies, has caused a serious harm to the local eco-environment. A biological tool, employing allelopathic inhibitory of eucalyptus to control M. aeruginosa, has been receiving tremendous attention. This work presents the results of the allelopathic inhibitory effects of eucalyptus (Eucalyptus grandis x E.urophylla ‘GLGU9’) ex- tracts of roots (ERE), stems (ESE), and leaves (ELE) on culture solutions of M. aeruginosa and its eco- physiological mechanism. The inhibitory effects of the extracts on the growth of M. aeruginosa varied greatly with ELE exhibiting the highest level of potency. Modes of action by which ELE inhibited M. aeruginosa growth were established. They involved reduction in photosynthesis, disruption of the cell membrane integrity, and inhibition of esterase activities of the cyanobacterial cells. However, ELE did not exhibit any gradients of toxicity towards zebrafish nor Washington grass plant. Species abundance and diversity in the systems remained likewise unaffected by ELE. The synergistic interaction between ELE and single-component allelochemicals (e.g., gallic acid and berberine) was ascribed to the increase in efficacy of allelochemicals in the various systems. The results of this study provide an underlying, novel, and attractive approach for controlling the growth of M. aeruginosa in aquatic environments. * Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, PR China > Department of Environmental Science, Mount Royal University, Calgary, AB, T3E 6K6, Canada Nei Zhao °, Zheng Zheng * ’, JunLei Zhang °, Saint-Fort Roger °, XingZhang Luo *

Fig. 1. (A) The change curves of M. aeruginosa density in presence of eucalyptus roots, stems and leaves extracts; (B) The change curves of M. aeruginosa density in presence of ELE with different concentrations.

Allelopathically inhibitory effects of eucalyptus extracts on the growth of Microcystis aeruginosa

Abstract: Using eucalyptus extracts of roots, steams, and leaves as algicidal agents. Eucalyptus extracts of leaves showed the highest inhibitory performance in limiting the growth of Microcystis aeruginosa. Strong allelopathy of eucalyptus extracts of leaves is responsible for controlling Microcystis aeruginosa. Species abundance and diversity in the systems were unaffected by eucalyptus extracts of leaves.

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Figure 10 - from Allelopathically inhibitory effects of

Figure 10 - from "Allelopathically inhibitory effects of eucalyptus extracts on the growth of Microcystis aeruginosa"