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  • 2015-2019
  • 2000-2004  (3)
  • 2000  (3)
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  • 2015-2019
  • 2000-2004  (3)
Year
  • 1
    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)
    Fulltext
  • 2
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    Unknown
    Response of Gracilaria conferta (Rhodophyta) to oligoagars results in defense against agar-degrading epiphytes (2000)
    Wiley
    In:  Journal of Phycology, 36 (6). pp. 1079-1086.
    Details
    Publication Date: 2020-07-20
    Description: Elicitation of Gracilaria conferta (Schousboe ex Montagne) J. ct G. Feldmann with oligoagars resulted in a defense response that was strong enough to kill epiphytic bacteria associated with the alga. Up to 60% of the resident bacterial flora of healthy plants was eliminated within 60 min after addition of neoagarohexaose to the algal medium. Single isolates of agar-degrading bacteria that had been isolated previously from healthy or decaying algal tissues proved to be more sensitive, Some of them were generally unable to survive on healthy G, conferta. Others survived on unelicited plants. Approximately 90% of these more resistant agar degraders were eliminated within 15 min after elicitation. The bacterial degradation of dead tissue of G, conferta resulted in a release of elicitors. The elicitors accumulated in the medium and reached high enough concentrations within 24 h to induce a hypersensitive response in healthy algae, The eliciting agent could be destroyed with beta -agarase and was thus probably oligoagar, Application of antibiotics prevented the accumulation of the elicitor, which indicated that bacteria were responsible for its release from the algal biomass, The hypersensitive response of G. conferta after contact with oligoagars is thus a true defense response, because it enables the plant to protect itself efficiently from enzymatic attacks on its cell wall.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1046/j.1529-8817.2000.00003.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
    facet.materialart.
    Unknown
    Endogenous and exogenous elicitors of a hypersensitive response in Gracilaria conferta (Rhodophyta) (2000)
    Springer
    In:  Journal of Applied Phycology, 12 (2). pp. 139-145.
    Details
    Publication Date: 2014-01-29
    Description: 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: Article , PeerReviewed
    Format: text
    DOI: 10.1023/A:1008119125911
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Article in a Scientific Journal - peer-reviewed
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