Isolation and Characterization of the Algicidal Bacterium DCJ-2

2014 ◽  
Vol 1065-1069 ◽  
pp. 3077-3082 ◽  
Author(s):  
Ting Ting Liu ◽  
Yu Fu Peng ◽  
Li Liu ◽  
Xue Shan Xia
Keyword(s):  
Natural Waters ◽  
Algal Species ◽  
Algicidal Activity ◽  
Algicidal Bacteria ◽  
Plectonema Boryanum ◽  
Lake Dianchi ◽  
Algicidal Bacterium ◽  
Isolation And Characterization ◽  
Bloom Water

Algicidal bacteria as part of the microbial populations in natural waters, is possible toinhibit the growth of algae or kill algae, dissolve algal cells in a direct or indirect way. In this study,four algicidal bacteria were isolated from cyanobacteria bloom water of Lake Dianchi, designated asDCJ-1, DCJ-2, DCJ-3, DCJ-4 respectively. The algicidal range and algicidal activity assay of the fouralgicidal bacteria showed that they have different algicidal range on the 10 tested algal species, whichstrain DCJ-2 has the best algicidal activity. The results indicated that bacterial strain DCJ-2 has highalgicidal activity against the Plectonema boryanum and exhibited algicidal activity through directattack. The lytic effect of strain DCJ-2 against Plectonema boryanum was time-dependent. It could be a potential bio-agent to control the blooms of cyanobacteria.

scholarly journals Algal Oxylipins Mediate the Resistance of Diatoms against Algicidal Bacteria

Marine Drugs ◽  
2018 ◽  
Vol 16 (12) ◽  
pp. 486 ◽  
Author(s):  
Nils Meyer ◽  
Johanna Rettner ◽  
Markus Werner ◽  
Oliver Werz ◽  
Georg Pohnert
Keyword(s):  
Fatty Acid ◽  
Bacterial Infection ◽  
Skeletonema Costatum ◽  
Algal Species ◽  
Lipid Mediators ◽  
Algicidal Bacteria ◽  
Mechanisms Of Resistance ◽  
Algicidal Bacterium ◽  
Diatom Skeletonema Costatum ◽  
Plankton Communities

Algicidal bacteria can lyse microalgal blooms and trigger shifts within plankton communities. Resistant algal species can escape lysis, and have the opportunity to dominate the phytoplankton after a bacterial infection. Despite their important function in ecosystem regulation, little is known about mechanisms of resistance. Here, we show that the diatom Chaetoceros didymus releases eicosanoid oxylipins into the medium, and that the lytic algicidal bacterium, Kordia algicida, induces the production of several wound-activated oxylipins in this resistant diatom. Neither releases nor an induction occurs in the susceptible diatom Skeletonema costatum that is lysed by the bacterium within a few days. Among the upregulated oxylipins, hydroxylated eicosapentaenoic acids (HEPEs) dominate. However, also, resolvins, known lipid mediators in mammals, increase upon exposure of the algae to the algicidal bacteria. The prevailing hydroxylated fatty acid, 15-HEPE, significantly inhibits growth of K. algicida at a concentration of approximately 1 µM. The oxylipin production may represent an independent line of defense of the resistant alga, acting in addition to the previously reported upregulation of proteases.

scholarly journals Algicidal bacterium CZBC1 inhibits the growth of Oscillatoria chlorina, Oscillatoria tenuis, and Oscillatoria planctonica

AMB Express ◽  
2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Xiao-Juan Hu ◽  
Yu Xu ◽  
Hao-Chang Su ◽  
Wu-Jie Xu ◽  
Li-Hua Wang ◽  
...  
Keyword(s):  
Algal Species ◽  
Algicidal Bacteria ◽  
Inhibitory Effects ◽  
The Sustainable Development ◽  
Initial Concentration ◽  
Algicidal Bacterium ◽  
Cyanobacteria Blooms ◽  
Cell Counts ◽  
Colony Forming Units ◽  
Harmful Cyanobacteria

Abstract Frequent harmful cyanobacteria blooms limit the sustainable development of aquaculture. Algicidal bacteria can efficiently control harmful algae without secondary pollution. The algicidal bacteria CZBC1 can lyse Oscillatoria spp. and other harmful cyanobacteria, but its effector mechanism and algicidal threshold are unknown. In this study, we examined the algicidal effect of CZBC1 on O. chlorina, O. tenuis, and O. planctonica by microscopic enumeration and scanning electron microscopy observation. Then, we examined the alginolytic effects of CZBC1 (concentrations 103–106 colony forming units (cfu)/mL) on these three species (concentrations 103–106 cells/mL) to determine the effective concentrations of CZBC1 for Oscillatoria spp. alginolysis. Results showed that CZBC1 can directly lyse O. chlorina and O. tenuis but indirectly lyse O. planctonica. When the initial concentration of CZBC1 was 106 cfu/mL, alginolytic effects were high for all three species at all concentrations, and the alginolytic rate could reach 100% in 3–9 days. When the initial concentration of CZBC1 was lower (103 cfu/mL), its inhibitory effects were delayed by 2–5 days, but the cell counts were significantly decreased compared with the control, evidencing significant alginolysis. In addition, the higher the concentration of the algicidal bacteria suspension, the more significant the alginolytic effects. Our results indicate that CZBC1 has different alginolytic mechanisms for O. chlorina, O. tenuis, and O. planctonica, and that different initial concentrations of CZBC1 have different alginolytic effects on these algal species.

Isolation and characterization of a marine algicidal bacterium against the toxic dinoflagellate Alexandrium tamarense

Harmful Algae ◽  
2007 ◽  
Vol 6 (6) ◽  
pp. 799-810 ◽  
Author(s):  
Jian Qiang Su ◽  
Xiao Ru Yang ◽  
Tian Ling Zheng ◽  
Yun Tian ◽  
Nian Zhi Jiao ◽  
...  
Keyword(s):  
Alexandrium Tamarense ◽  
Toxic Dinoflagellate ◽  
Algicidal Bacterium ◽  
Isolation And Characterization

Isolation and characterization of a marine algicidal bacterium against the harmful raphidophyceae Chattonella marina

2009 ◽  
Vol 47 (1) ◽  
pp. 9-18 ◽  
Author(s):  
Yun Sook Kim ◽  
Dae-Sung Lee ◽  
Seong-Yun Jeong ◽  
Woe Jae Lee ◽  
Myung-Suk Lee
Keyword(s):  
Chattonella Marina ◽  
Algicidal Bacterium ◽  
Isolation And Characterization
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