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dc.contributor.authorWei, Lili
dc.contributor.authorChen, Chengrong
dc.contributor.authorYu, Shen
dc.description.abstractBackground: Demonstration of the uptake of organic nitrogen (N) by many boreal plant species and the identification of the transporters mediating amino acid uptake have attracted increasing attention, focusing on organic N uptake by plant species worldwide, particularly by species in tropical and subtropical regions. Due to the rapid decomposition of organic N by plants and the dilution of its isotopes, the capacity of the methods used to test plant uptake of organic N are controversial. The ecological significance of organic N uptake is also under debate. Aims: To assess whether two subtropical species, Araucaria bidwillii and A. cunninghamii, have the ability to take up intact organic N, and whether organic N is their preference. Methods: We used a dual-isotope-labelling method that explicitly took into account isotope dilution, in order to minimise the possibility of differential isotope dilution among different nitrogen forms. Results: Both study species showed the ability to take up glycine intact, which was indicated by the non-significant difference between the 13C : 15N ratio in fine roots and that of glycine (i.e. 1 : 1). However, the discrepancy in the 13C : 15N ratios after 72 h indicated that the absorbed glycine was being metabolised quickly. In addition, the profound preference of these two plant species for NO3−-N relative to organic N suggests that organic N may only become an important N source for these subtropical plants during times when soil NO3−-N is scarce.
dc.publisherTaylor & Francis
dc.relation.ispartofjournalPlant Ecology and Diversity
dc.subject.fieldofresearchBiological Sciences not elsewhere classified
dc.subject.fieldofresearchEcological Applications
dc.subject.fieldofresearchPlant Biology
dc.titleUptake of organic nitrogen and preference for inorganic nitrogen by two Australian native Araucariaceae species
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, Griffith School of Environment
gro.hasfulltextNo Full Text
gro.griffith.authorChen, Chengrong
gro.griffith.authorWei, Lili

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