Effects of nitrogen source and ectomycorrhizal association on growth and δ15 N of two subtropical Eucalyptus species from contrasting ecosystems

Functional Plant Biology : FPB
Susanne SchmidtTanuwong Sangtiean

Abstract

Ectomycorrhizal (EM) associations facilitate plant nitrogen (N) acquisition, but the contribution of EM associations to tree N nutrition is difficult to ascertain in ecosystems. We studied the abilities of subtropical EM fungi and nutritionally contrasting Eucalyptus species, Eucalyptus grandis W.Hill ex Maiden and Eucalyptus racemosa Cav, to use N sources in axenic and soil cultures, and determined the effect of EM fungi on plant N use and plant 15N natural abundance (δ15N). As measured by seedling growth, both species showed little dependence on EM when growing in the N-rich minerotrophic soil from E. grandis rainforest habitat or in axenic culture with inorganic N sources. Both species were heavily dependent on EM associations when growing in the N-poor, organotrophic soil from the E. racemosa wallum habitat or in axenic culture with organic N sources. In axenic culture, EM associations enabled both species to use organic N when supplied with amide-, peptide- or protein-N. Grown axenically with glutamine- or protein-N, δ15N of almost all seedlings was lower than source N. The δ15N of all studied organisms was higher than the N source when grown on glutathione. This unexpected 15N enrichment was perhaps due to preferential up...Continue Reading

References

Feb 17, 2001·Trends in Ecology & Evolution·D Robinson
Mar 10, 2001·Trends in Plant Science·R D Evans
Jun 20, 2002·Mycorrhiza·J Ignacio Rangel-CastroAndy F S Taylor
Sep 26, 2002·FEBS Letters·Daniel WipfWolf B Frommer
Jun 1, 2004·Functional Plant Biology : FPB·Susanne SchmidtGeorge R Stewart

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Citations

Sep 12, 2012·The New Phytologist·Erik A Hobbie, Peter Högberg
Mar 13, 2008·Proceedings of the National Academy of Sciences of the United States of America·Chanyarat Paungfoo-LonhienneSusanne Schmidt

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