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Andreas Beck and Christoph Mayr Nitrogen and carbon isotope variability in the green-algal lichen Xanthoria parietina and their implications on mycobiont–photobiont interactions Ecology and Evolution 2

Version of Record online: 8 NOV 2012 | DOI: 10.1002/ece3.417

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We provide first information on the influences of substrate and photobiont/mycobiont ratio on carbon and nitrogen stable isotope signatures of lichens, and additionally shed some light on the mode of nitrogen acquisition in green-algal lichens. This is an important topic as nitrogen is limiting lichen growth and almost no experimental data is available to explain nitrogen acquisition and distribution between the symbionts. Our data demonstrate that most nitrogen supplied to the green-algal photobiont in Xanthoria parietina is likely independent of the mycobiont, but probably occurs via the gaseous phase (ammonia) and not the liquid (apoplastic) phase.

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