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The effect of nitrogen on growth and key thallus components in the two tripartite lichens, Nephroma arcticum and Peltigera aphthosa by B. Sundberg; T. Näsholm; K. Palmqvist is a Agricultural and Biological Sciences article available to read on EtoBox.
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## ABSTRACT Relationships between growth, nitrogen and concentration of unique biont components were investigated for the tripartite lichens __Nephroma arcticum__ (L.) Torss. and __Peltigera aphthosa__ (L.) Willd. Nitrogen availability was manipulated during 4 summer months by removing cephalodia and their associated N~2~ fixation activity, or by weekly irrigation with NH~4~NO~3~. Chlorophyll and ribulose 1·5‐biphosphate carboxylase/oxygenase (Rubisco), and chitin and ergosterol were used as photobiont and mycobiont markers, respectively. Nitrogen concentrations were similar in older and newer parts of the same thallus, varying between 2 and 5 g m^−^^2^, with __P. aphthosa__ having higher concentrations than __N. arcticum__. Both chlorophyll (Chl __a__) and chitin were linearly correlated with thallus N, but __N. arcticum__ invested more in fungal biomass and had lower Chl __a__ concentrations in comparison with __P. aphthosa__ at equal thallus N. During the 4 months, control and N‐fertilized thalli of __N. arcticum__ increased in area by 0·2 m^2^ m^−^^2^ and __P. aphthosa__ by 0·4 m^2^ m^−^^2^. Thallus expansion was significantly inhibited in samples without cephalodia, but there
Who reads The effect of nitrogen on growth and key thallus components in the two tripartite lichens, Nephroma arcticum and Peltigera aphthosa?
It is typically read by researchers, students, and practitioners in Agricultural and Biological Sciences.
- Author
- B. Sundberg; T. Näsholm; K. Palmqvist
- Publisher
- John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0140-7791)
- Published
- 2001
- Language
- EN
- Field
- Agricultural and Biological Sciences (Life Sciences)