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  • epiphytic bacteria  (2)
  • Agarophyton; DAPI; Epibacteria; Epibacterial cell density; Experimental treatment; Sample ID; Time point, descriptive  (1)
Document type
Keywords
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  • 1
    Electronic Resource
    Electronic Resource
    Bacterial induction and inhibition of a fast mecrotic response in Gracilaria conferta (Rhodophyta) (1997)
    Springer
    Journal of applied phycology 9 (1997), S. 277-285 
    Details
    ISSN: 1573-5176
    Keywords: cefotaxim ; epiphytic bacteria ; Gracilaria ; seaweed-microbe interactions ; seaweed pathology ; Vancomycin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Of 45 bacterial isolates from healthy tips of Gracilaria conferta (Schousboe ex Montagne) J. et G. Feldmann, 29% were identified as ‘conditional inducers’ of an apical necrosis. That is, the isolates induced necrotic tips in G. conferta within 16 h after elimination of most of the resident microflora from the alga. Several disinfectants and antibiotics were screened for their ability to induce algal susceptibility to the bacteria and to suppress uncontrolled appearance of tip necrosis. Treatment with 100 mg L-1 Cefotaxim + 100 mg L-1Vancomycin over three days was the least damaging and most efficient. Tip necrosis was related to isolates of the Corynebacterium-Arthrobacter-group and to the Flavobacterium-Cytophaga-group. The damaging effect occurred due to the bacterial excretion of active agents and was not correlated with acapability to degrade agar. The damaging influence of four Cytophaga-likestrains was inhibited by 20 of 40 isolates. This protective effect was caused by very different organisms. In five of six cases examined further, the effect was not cellbound, but due to the excretion of agents. These were not antimicrobially active, but inactivated necrosis-inducing excretions. These results indicate that epiphytic bacterial degradation or inactivation of damaging agents is a protecting factor in Gracilaria, which prevents the alga from being harmed by epiphytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007990712925
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Endogenous and exogenous elicitors of a hypersensitive response in Gracilaria conferta (Rhodophyta) (2000)
    Springer
    Journal of applied phycology 12 (2000), S. 139-145 
    Details
    ISSN: 1573-5176
    Keywords: cellulose ; epiphytic bacteria ; Gracilaria conferta ; oligosaccharide ; peptide,plant-pathogen interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Certain forms of oligocellulose and certainbacterially excreted peptides were identified asendogenous and exogenous elicitors, respectively, ofa tip bleaching response in Gracilaria conferta(Schousboe ex Montagne) J. et G. Feldmann. Thehalf-maximal tip bleaching response was observed when31.1 μM cellobiose or 11.6 μM cellotetraosewere present in the growth medium. In contrast, noresponse was detected after exposure to glucose,cellotriose, cellopentaose or maltooligosaccharides.The response was thus strongly dependent on themolecular size of the oligocellulose and onlysaccharides that consisted of an even number ofglucose residues were elicitor-active. Three bacterialspecies that had earlier been identified as potentialinducers of the tip bleaching symptom excretedelicitor-active compounds into the growth medium.These compounds were protease-sensitive and thuspeptides or proteins. The tip bleaching-inducingcompound that was excreted by one Cytophaga-likeorganism was partially purified. It could be extractedfrom culture supernatants with chloroform and itsmolecular size was between 700 and 1500 Da,corresponding with a structure of 4–20 amino acids.Various endogenous and exogenous elicitors are thusrecognized by G. conferta and allow this alga torespond hypersensitively to the maceration of its cellwall skeleton or just to the presence of certainepiphytic organisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008119125911
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    Paper (German National Licenses)
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  • 3
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    Experiment on epibacterial abundance on surface of Agarophyton (2019)
    PANGAEA
    In:  Supplement to: Saha, Mahasweta; Künzel, Sven; Meichssner, Rafael; Neulinger, Sven C; Petersen, Finn Ole; Weinberger, Florian (2020): Salinity and Time Can Alter Epibacterial Communities of an Invasive Seaweed. Frontiers in Microbiology, 10, https://doi.org/10.3389/fmicb.2019.02870
    Details
    Publication Date: 2023-01-13
    Description: In order to assess the effect salinities and time points on bacterial cell density on surface of the alga, epibacterial cell density from T1 and T2 (n=5 for each salinity level and each time point) was determined via fluorescence microscopy of DAPI-stained bacterial cells. Epibacterial cell density samples from T0 were generated from 5 individuals prior to start of the treatment to obtain cell density values from T0. For methodological details, see Appendix S1 in supplementary information. Briefly, the bacteria attached to the surface of a defined quantity of Agarophyton were suspended in seawater via sonification and vortexing with sterile glass beads. The cells were then enriched on nitrocellulose filters, stained using standard techniques, and counted under epifluorescence microscopy, and the results were standardized based on the sampled thallus area.
    Keywords: Agarophyton; DAPI; Epibacteria; Epibacterial cell density; Experimental treatment; Sample ID; Time point, descriptive
    Type: Dataset
    Format: text/tab-separated-values, 135 data points
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    DATA PANGAEA
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