Details

Autor(en) / Beteiligte

• Zeng, Yudie
• Wang, Jiayu
• Yang, Chunyan
• Ding, Mengyue
• Hamilton, Paul B.
• Zhang, Xiaohui
• Yang, Caiyun
• Zhnag, Lei
• Dai, Xianzhu

Titel

A Streptomyces globisporus strain kills Microcystis aeruginosa via cell-to-cell contact

Ist Teil von

• The Science of the total environment, 2021-05, Vol.769, p.144489, Article 144489

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2021

Quelle

MEDLINE

Beschreibungen/Notizen

• Cyanobacterial harmful algal blooms (CyanoHABs) bring economic loss, damage aquatic ecosystems, and produce cyanobacterial toxins that threaten human health. Algicidal bacteria as pathogens can expediate the decline of CyanoHABs. In this study, a Streptomyces globisporus strain (designated G9), isolated from soil near a eutrophic pond, showed high algicidal activity against Microcystis aeruginosa. Experimental results show that G9 preyed on Microcystis through cell-to-cell contact: (1) the hyphae of G9 killed cyanobacterial cells by twining around them, while cells beyond the reach of G9 hyphae were in normal shapes; (2) No algicides were detectable in the supernatant of G9 cultures or G9-Microcystis cocultures. The algicidal ratio of G9 to M. aeruginosa reached 96.7% after 6 days. G9 selectively killed the tested cyanobacterial strains, while it had only minor impacts on the growth of tested Chlorophyceae. Differential gene expression studies show that G9 affected the expression of key genes of M. aeruginosa involved in photosynthesis, microcystin synthesis and cellular emergency responses. Further, the microcystin-LR content decreased gradually with G9 treatment. As the first reported Streptomyces sp. with algicidal (predation) activity requiring cell-to-cell contact with target prey, G9 is a good candidate for the exploration of additional cyanobacteria-bacteria interactions and the development of novel strategies to control CyanoHABs. [Display omitted] •G9 is the first recorded Streptomyces killing Microcystis only by direct cell attack.•G9 utilized Microcystis-derived nutrients for growth and formed a lot of spores.•G9 selectively killed cyanobacteria without major impacts on the tested green alga.•G9 influenced the expression of some key genes of M. aeruginosa.