UZH-Logo

Antagonistic interactions between filamentous heterotrophs and the cyanobacterium Nostoc muscorum


Svercel, M; Saladin, B; van Moorsel, S J; Wolf, S; Bagheri, Homayoun C (2011). Antagonistic interactions between filamentous heterotrophs and the cyanobacterium Nostoc muscorum. BMC Research Notes, 4:357.

Abstract

Background: Little is known about interactions between filamentous heterotrophs and filamentous cyanobacteria.
Here, interactions between the filamentous heterotrophic bacteria Fibrella aestuarina (strain BUZ 2) and Fibrisoma
limi (BUZ 3) with an axenic strain of the autotrophic filamentous cyanobacterium Nostoc muscorum (SAG 25.82)
were studied in mixed cultures under nutrient rich (carbon source present in medium) and poor (carbon source
absent in medium) conditions.
Findings: F. aestuarina BUZ 2 significantly reduced the cyanobacterial population whereas F. limi BUZ 3 did not.
Physical contact between heterotrophs and autotroph was observed and the cyanobacterial cells showed some level of damage and lysis. Therefore, either contact lysis or entrapment with production of extracellular compounds
in close vicinity of host cells could be considered as potential modes of action. The supernatants from pure heterotrophic cultures did not have an effect on Nostoc cultures. However, supernatant from mixed cultures of BUZ 2 and Nostoc had a negative effect on cyanobacterial growth, indicating that the lytic compounds were only produced in the presence of Nostoc. The growth and survival of tested heterotrophs was enhanced by the presence of Nostoc or its metabolites, suggesting that the heterotrophs could utilize the autotrophs and its products as a nutrient source. However, the autotroph could withstand and out-compete the heterotrophs under nutrient poor conditions.
Conclusions: Our results suggest that the nutrients in cultivation media, which boost or reduce the number of
heterotrophs, were the important factor influencing the outcome of the interplay between filamentous heterotrophs and autotrophs. For better understanding of these interactions, additional research is needed. In particular, it is necessary to elucidate the mode of action for lysis by heterotrophs, and the possible defense mechanisms of the autotrophs.

Background: Little is known about interactions between filamentous heterotrophs and filamentous cyanobacteria.
Here, interactions between the filamentous heterotrophic bacteria Fibrella aestuarina (strain BUZ 2) and Fibrisoma
limi (BUZ 3) with an axenic strain of the autotrophic filamentous cyanobacterium Nostoc muscorum (SAG 25.82)
were studied in mixed cultures under nutrient rich (carbon source present in medium) and poor (carbon source
absent in medium) conditions.
Findings: F. aestuarina BUZ 2 significantly reduced the cyanobacterial population whereas F. limi BUZ 3 did not.
Physical contact between heterotrophs and autotroph was observed and the cyanobacterial cells showed some level of damage and lysis. Therefore, either contact lysis or entrapment with production of extracellular compounds
in close vicinity of host cells could be considered as potential modes of action. The supernatants from pure heterotrophic cultures did not have an effect on Nostoc cultures. However, supernatant from mixed cultures of BUZ 2 and Nostoc had a negative effect on cyanobacterial growth, indicating that the lytic compounds were only produced in the presence of Nostoc. The growth and survival of tested heterotrophs was enhanced by the presence of Nostoc or its metabolites, suggesting that the heterotrophs could utilize the autotrophs and its products as a nutrient source. However, the autotroph could withstand and out-compete the heterotrophs under nutrient poor conditions.
Conclusions: Our results suggest that the nutrients in cultivation media, which boost or reduce the number of
heterotrophs, were the important factor influencing the outcome of the interplay between filamentous heterotrophs and autotrophs. For better understanding of these interactions, additional research is needed. In particular, it is necessary to elucidate the mode of action for lysis by heterotrophs, and the possible defense mechanisms of the autotrophs.

Citations

Altmetrics

Downloads

150 downloads since deposited on 27 Sep 2011
24 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Systematic Botany and Botanical Gardens
07 Faculty of Science > Department of Plant and Microbial Biology
07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
07 Faculty of Science > Zurich-Basel Plant Science Center
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
580 Plants (Botany)
Language:English
Date:2011
Deposited On:27 Sep 2011 12:52
Last Modified:05 Apr 2016 15:01
Publisher:BioMed Central
ISSN:1756-0500
Publisher DOI:10.1186/1756-0500-4-357
PubMed ID:21914201
Permanent URL: http://doi.org/10.5167/uzh-49794

Download

[img]
Preview
Content: Published Version
Filetype: PDF
Size: 3MB
View at publisher

TrendTerms

TrendTerms displays relevant terms of the abstract of this publication and related documents on a map. The terms and their relations were extracted from ZORA using word statistics. Their timelines are taken from ZORA as well. The bubble size of a term is proportional to the number of documents where the term occurs. Red, orange, yellow and green colors are used for terms that occur in the current document; red indicates high interlinkedness of a term with other terms, orange, yellow and green decreasing interlinkedness. Blue is used for terms that have a relation with the terms in this document, but occur in other documents.
You can navigate and zoom the map. Mouse-hovering a term displays its timeline, clicking it yields the associated documents.

Author Collaborations