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Growth, nitrogen up...
Growth, nitrogen uptake, and resource allocation in the two tripartite lichens Nephroma arcticum and Peltigera aphthosa during nitrogen stress
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- Dahlman, L (författare)
- Umeå universitet,Ekologi och geovetenskap
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Näsholm, T (författare)
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- Palmqvist, K (författare)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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(creator_code:org_t)
- 2002
- 2002
- Engelska.
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Ingår i: New Phytologist. - 0028-646X. ; 153:2, s. 307-315
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The lichens were irrigated with different N forms, enriched in 15N to assess N uptake, during 3 months in the field, with a total N dosage of 500 mg m−2. Nitrogen deprivation was induced by removing the nitrogen-fixing cephalodia. The lichens took up 11–134 mg N m−2 of the added N, corresponding to 1–4% of their total thallus N. Uptake was 4 times higher for NH4+ than for NO3−, and the highest 15N concentrations were found in newly synthesized tissue. Both forms of N stress affected thallus expansion rates in both species. It is concluded that the two lichens were able to maintain a balanced tissue N concentration despite large variations in N supply, and that assimilated N might be transported to growing apices. Alternatively, N assimilation from external sources might be greater in the margins than in the mature thallus. Thallus expansion was sensitive to N stress, apparently being tightly coupled to N assimilation.
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- art (ämneskategori)
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