Document Detail


Nitrogen in cell walls of sclerophyllous leaves accounts for little of the variation in photosynthetic nitrogen-use efficiency.
MedLine Citation:
PMID:  19054350     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Photosynthetic rate per unit nitrogen generally declines as leaf mass per unit area (LMA) increases. To determine how much of this decline was associated with allocating a greater proportion of leaf nitrogen into cell wall material, we compared two groups of plants. The first group consisted of two species from each of eight genera, all of which were perennial evergreens growing in the Australian National Botanic Gardens (ANBG). The second group consisted of seven Eucalyptus species growing in a greenhouse. The percentage of leaf biomass in cell walls was independent of variation in LMA within any genus, but varied from 25 to 65% between genera. The nitrogen concentration of cell wall material was 0.4 times leaf nitrogen concentration for all species apart from Eucalyptus, which was 0.6 times leaf nitrogen concentration. Between 10 and 30% of leaf nitrogen was recovered in the cell wall fraction, but this was independent of LMA. No trade-off was observed between nitrogen associated with cell walls and the nitrogen allocated to ribulose 1.5-bisphosphate carboxylase/oxygenase (Rubisco). Variation in photosynthetic rate per unit nitrogen could not be explained by variation in cell wall nitrogen.
Authors:
Matthew T Harrison; Everard J Edwards; Graham D Farquhar; Adrienne B Nicotra; John R Evans
Publication Detail:
Type:  Journal Article     Date:  2008-11-25
Journal Detail:
Title:  Plant, cell & environment     Volume:  32     ISSN:  1365-3040     ISO Abbreviation:  Plant Cell Environ.     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-02-03     Completed Date:  2009-02-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9309004     Medline TA:  Plant Cell Environ     Country:  United States    
Other Details:
Languages:  eng     Pagination:  259-70     Citation Subset:  IM    
Affiliation:
Research School of Biological Sciences, The Australian National University, Canberra, ACT 2601, Australia.
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MeSH Terms
Descriptor/Qualifier:
Biomass
Carbon Dioxide / metabolism
Carbon Isotopes / analysis
Cell Wall / chemistry*
Eucalyptus / chemistry*
Nitrogen / analysis*
Photosynthesis / physiology*
Plant Leaves / chemistry*
Ribulose-Bisphosphate Carboxylase / metabolism
Chemical
Reg. No./Substance:
0/Carbon Isotopes; 124-38-9/Carbon Dioxide; 7727-37-9/Nitrogen; EC 4.1.1.39/Ribulose-Bisphosphate Carboxylase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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