Transport, storage and mobilization of nitrogen by trees and shrubs in the wet/dry tropics of northern Australia

Schmidt, S and Stewart, GR (1998) Transport, storage and mobilization of nitrogen by trees and shrubs in the wet/dry tropics of northern Australia. Tree Physiology, 18 6: 403-410. doi:10.1093/treephys/18.6.403


Author Schmidt, S
Stewart, GR
Title Transport, storage and mobilization of nitrogen by trees and shrubs in the wet/dry tropics of northern Australia
Journal name Tree Physiology   Check publisher's open access policy
ISSN 0829-318X
Publication date 1998
Sub-type Article (original research)
DOI 10.1093/treephys/18.6.403
Open Access Status Not Open Access
Volume 18
Issue 6
Start page 403
End page 410
Total pages 8
Language eng
Abstract Xylem sap from woody species in the wet/dry tropics of northern Australia was analyzed for N compounds. At the peak of the dry season, arginine was the main N compound in sap of most species of woodlands and deciduous monsoon forest. In the wet season, a marked change occurred with amides becoming the main sap N constituents of most species. Species from an evergreen monsoon forest, with a permanent water source, transported amides in the dry season. In the dry season, nitrate accounted for 7 and 12% of total xylem sap N in species of deciduous and evergreen monsoon forests, respectively In the wet season, the proportion of N present as nitrate increased to 22% in deciduous monsoon forest species. These results suggest that N is taken up and assimilated mainly in the wet season and that this newly assimilated N is mostly transported as amide-N (woodland species, monsoon forest species) and nitrate (monsoon forest species). Arginine is the form in which stored N is remobilized and transported by woodland and deciduous monsoon forest species in the dry season. Several proteins, which may represent bark storage proteins, were detected in inner bark tissue from a range of trees in the dry season, indicating that, although N uptake appears to be limited in the dry season, the many tree and shrub species that produce flowers, fruit or leaves in the dry season use stored N to support growth. Nitrogen characteristics of the studied species are discussed in relation to the tropical environment.
Keyword Forestry
Amides
Monsoon Forest
Nitrate
Nitrogen Fixation
Nitrogen Transport
Storage Protein
Tropical Savanna Woodland
Ureides
Xylem Sap
Populus X Canadensis
Xylem Sap
Seasonal-changes
Poplar Trees
Amino-acids
Sambucus-nigra
Protein Bodies
Ray Cells
Bark
Nitrate
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Biological Sciences Publications
Ecology Centre Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 33 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Mon, 13 Aug 2007, 10:29:20 EST