Abstract
The responses of Gracilaria lemaneiformis, an easily epiphytized host,and the relatively resistant G. cornea mutant, to the green alga Ulva lactuca were studied using biculture experiments with and withoutantibiotics. Both Gracilaria species grown with and without U.lactuca showed different levels of growth rate, release of hydrogenperoxide and of halogenated hydrocarbons. These quantitative differencesled to a successful response against Ulva lactuca in the case of G.cornea mutant and to a failure in response in the case of G.lemaneiformis. The response of each Gracilaria species to U.lactuca was qualitatively similar to its response to bacteria. This suggeststhe involvement of oligosaccharide elicitors produced in the presence ofepiphytes and bacteria. A clear Gracilaria inhibition was demonstratedwith extracts of the culture medium. It appears that hydrogen peroxide,halogenated hydrocarbons and oligosaccharides may be components of theinhibitory activity of the extracts. The responses of Gracilaria speciesto the presence of U. lactuca suggest the characterization of adefence response.
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Friedlander, M., Kashman, Y., Weinberger, F. et al. Gracilaria and its epiphytes: 4. The response of two Gracilaria species to Ulva lactuca in a bacteria-limited environment. Journal of Applied Phycology 13, 501–507 (2001). https://doi.org/10.1023/A:1012593400901
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DOI: https://doi.org/10.1023/A:1012593400901