Growth, nitrogen uptake, and resource allocation in the two tripartite lichens Nephroma arcticum and Peltigera aphthosa during nitrogen stress. Dahlman, L., Näsholm, T., & Palmqvist, K. New Phytologist, 153(2):307–315, 2002. _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.0028-646X.2001.00321.x![Growth, nitrogen uptake, and resource allocation in the two tripartite lichens Nephroma arcticum and Peltigera aphthosa during nitrogen stress [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex • Lichen responses towards nitrogen stress, both increased exposure and deprivation of N, were investigated by measuring N uptake, growth, ergosterol, chitin and Chla in two tripartite nitrogen-fixing species, Nephroma arctium and Peltigera aphthosa. • 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.
@article{dahlman_growth_2002,
title = {Growth, nitrogen uptake, and resource allocation in the two tripartite lichens {Nephroma} arcticum and {Peltigera} aphthosa during nitrogen stress},
volume = {153},
issn = {1469-8137},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1046/j.0028-646X.2001.00321.x},
doi = {10/d2q5rz},
abstract = {• Lichen responses towards nitrogen stress, both increased exposure and deprivation of N, were investigated by measuring N uptake, growth, ergosterol, chitin and Chla in two tripartite nitrogen-fixing species, Nephroma arctium and Peltigera aphthosa. • 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.},
language = {en},
number = {2},
urldate = {2021-10-19},
journal = {New Phytologist},
author = {Dahlman, Lena and Näsholm, Torgny and Palmqvist, Kristin},
year = {2002},
note = {\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.0028-646X.2001.00321.x},
keywords = {15N, chitin, chlorophyll, ergosterol, lichen growth, nitrogen stress, nitrogen uptake, resource allocation},
pages = {307--315},
}
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