Nodulated N-2-fixing Casuarina cunninghamiana is the sink for net N transfer from non-N-2-fixing Eucalyptus maculata via an ectomycorrhizal fungus Pisolithus sp using (NH4+)-N-15 or (NO3-)-N-15 supplied as ammonium nitrate

He, XH, Critchley, C, Ng, H and Bledsoe, C (2005) Nodulated N-2-fixing Casuarina cunninghamiana is the sink for net N transfer from non-N-2-fixing Eucalyptus maculata via an ectomycorrhizal fungus Pisolithus sp using (NH4+)-N-15 or (NO3-)-N-15 supplied as ammonium nitrate. New Phytologist, 167 3: 897-912. doi:10.1111/j.1469-8137.2005.01437.x


Author He, XH
Critchley, C
Ng, H
Bledsoe, C
Title Nodulated N-2-fixing Casuarina cunninghamiana is the sink for net N transfer from non-N-2-fixing Eucalyptus maculata via an ectomycorrhizal fungus Pisolithus sp using (NH4+)-N-15 or (NO3-)-N-15 supplied as ammonium nitrate
Journal name New Phytologist   Check publisher's open access policy
ISSN 0028-646X
Publication date 2005-01-01
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1111/j.1469-8137.2005.01437.x
Open Access Status Not yet assessed
Volume 167
Issue 3
Start page 897
End page 912
Total pages 16
Editor F.I. Woodward
Place of publication UK
Publisher Blackwell Publishing
Language eng
Subject C1
270402 Plant Physiology
780105 Biological sciences
Abstract To determine the effects of nitrogen source on rates of net N transfer between plants connected by a common mycorrhizal network, we measured transfer of N supplied as (NH4NO3)-N-15-N-14 or (NH4NO3)-N-14-N-15 in three Casuarina/Eucalyptus treatments interconnected by a Pisolithus sp. The treatments were nonnodulated nonmycorrhizal/nonmycorrhizal; nonnodulated mycorrhizal/mycorrhizal; and nodulated mycorrhizal/mycorrhizal. Mycorrhization was 67% in Eucalyptus and 36% in Casuarina. N-2 fixation supplied 38% of the N in Casuarina. Biomass, N and N-15 contents were lowest in nonmycorrhizal plants and greatest in plants in the nodulated/mycorrhizal treatment. Nitrogen transfer was enhanced by mycorrhization and by nodulation, and was greater when N was supplied as (NH4+)-N-15 than (NO3-)-N-15. Nitrogen transfer rates were lowest in the nonmycorrhizal treatment for either N-15 source, and greatest in the nodulated, mycorrhizal treatment. Transfer was greater to Casuarina than to Eucalyptus and where ammonium rather than nitrate was the N source. Irrespective of N-15 source and of whether Casuarina or Eucalyptus was the N sink, net N transfer was low and was similar in both nonnodulated treatments. However, when Casuarina was the N sink in the nodulated, mycorrhizal treatment, net N transfer was much greater with (NH4+)-N-15 than with (NO3-)-N-15. High N demand by Casuarina resulted in greater net N transfer from the less N-demanding Eucalyptus. Net transfer of N from a non-N-2-fixing to an N-2-fixing plant may reflect the very high N demand of N-2-fixing species.
Keyword Plant Sciences
Casuarina Cunninghamiana
Common Ectomycorrhizal Networks (cmns)
Eucalyptus Maculata
Frankia
(nh4no3)-n-14-n-15
(nh4no3)-n-15-n-14
Pisolithus Sp.
Two-way Net N Transfer
Arbuscular Mycorrhizal Fungus
Inorganic Nitrogen-sources
Water-stressed Conditions
N-15 Abundance
Pinus-pinaster
Nitrification Inhibitors
Hebeloma-cylindrosporum
Transport Processes
Foliar Analysis
Soil Properties
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: Excellence in Research Australia (ERA) - Collection
2006 Higher Education Research Data Collection
School of Biological Sciences Publications
 
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Created: Wed, 15 Aug 2007, 15:25:05 EST