Photosynthetic capacity in relation to nitrogen content and its partitioning in lichens with different photobionts

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Fältnamn	Indikatorer	Metadata
000		03415naa a2200325 4500
001		oai:DiVA.org:oru-37409
003		SwePub
008		141002s1998 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-374092 URI
024	7	a https://doi.org/10.1046/j.1365-3040.1998.00279.x2 DOI
040		a (SwePub)oru
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Palmqvist, Ku Umeå University, Umeå, Sweden4 aut
245	1 0	a Photosynthetic capacity in relation to nitrogen content and its partitioning in lichens with different photobionts
264	1	b Wiley,c 1998
338		a print2 rdacarrier
520		a We tested the hypothesis that lichen species with a photosynthetic CO2-concentrating mechanism (CCM) use nitrogen more efficiently in photosynthesis than species without this mechanism. Total ribulose bisphosphate carboxylase-oxygenase (Rubisco; EC 4.1.1.39) and chitin (the nitrogenous component of fungal cell walls), were quantified and related to photosynthetic capacity in eight lichens. The species represented three modes of CO2 acquisition and two modes of nitrogen acquisition, and included one cyanobacterial (Nostoc) lichen with a CCM and N2 fixation, four green algal (Trebouxia) lichens with a CCM but without N2 fixation and three lichens with green algal primary photobionts (Coccomyxa or Dictyochloropsis) lacking a CCM. The latter have N2-fixing Nostoc in cephalodia. When related to thallus dry weight, total thallus nitrogen varied 20-fold, chitin 40-fold, Chl a 5-fold and Rubisco 4-fold among the species. Total nitrogen was lowest in three of the four Trebouxia lichens and highest in the bipartite cyanobacterial lichen. Lichens with the lowest nitrogen invested a larger proportion of this into photosynthetic components, while the species with high nitrogen made relatively more chitin. As a result, the potential photosynthetic nitrogen use efficiency was negatively correlated to total thallus nitrogen for this range of species. The cyanobacterial lichen had a higher photosynthetic capacity in relation to both Chl a and Rubisco compared with the green algal lichens. For the range of green algal lichens both Chl a and Rubisco contents were linearly related to photosynthetic capacity, so the data did not support the hypothesis of an enhanced photosynthetic nitrogen use efficiency in green-algal lichens with a CCM.
650	7	a NATURVETENSKAPx Biologix Annan biologi0 (SwePub)106992 hsv//swe
650	7	a NATURAL SCIENCESx Biological Sciencesx Other Biological Topics0 (SwePub)106992 hsv//eng
653		a chlorophyll; chitin; cyanobacteria; CO2-concentrating mechanism; green alga; lichen; nitrogen; photosynthesis; Rubisco
700	1	a Campbell, Du Mount Allison University, Sackville, Canada4 aut
700	1	a Ekblad, Alfu Swedish University of Agricultural Sciences, Umeå, Sweden4 aut0 (Swepub:oru)afed
700	1	a Johansson, Hu Umeå University, Umeå, Sweden4 aut
710	2	a Umeå University, Umeå, Swedenb Mount Allison University, Sackville, Canada4 org
773	0	t Plant, Cell and Environmentd : Wileyg 21:4, s. 361-372q 21:4<361-372x 0140-7791x 1365-3040
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-37409
856	4 8	u https://doi.org/10.1046/j.1365-3040.1998.00279.x

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Av författaren/redakt...: Palmqvist, K; Campbell, D; Ekblad, Alf; Johansson, H

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NATURVETENSKAP: NATURVETENSKAP; och Biologi; och Annan biologi

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Av lärosätet: Örebro universitet

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