Reciprocal N ((NH4+)-N-15 or (NO3-)-N-15) transfer between nonN(2)-fixing Eucalyptus maculata and N-2-fixing Casuarina cunninghamiana linked by the ectomycorrhizal fungus Pisolithus sp.

He, X. H., Critchley, C., Ng, H. and Bledsoe, C. (2004) Reciprocal N ((NH4+)-N-15 or (NO3-)-N-15) transfer between nonN(2)-fixing Eucalyptus maculata and N-2-fixing Casuarina cunninghamiana linked by the ectomycorrhizal fungus Pisolithus sp.. New Phytologist, 163 3: 629-640. doi:10.1111/j.1469-8137.2004.01137.x


Author He, X. H.
Critchley, C.
Ng, H.
Bledsoe, C.
Title Reciprocal N ((NH4+)-N-15 or (NO3-)-N-15) transfer between nonN(2)-fixing Eucalyptus maculata and N-2-fixing Casuarina cunninghamiana linked by the ectomycorrhizal fungus Pisolithus sp.
Journal name New Phytologist   Check publisher's open access policy
ISSN 0028-646X
Publication date 2004-09
Sub-type Article (original research)
DOI 10.1111/j.1469-8137.2004.01137.x
Volume 163
Issue 3
Start page 629
End page 640
Total pages 12
Place of publication UK
Publisher Blackwell Publishing Ltd
Collection year 2004
Language eng
Subject C1
270402 Plant Physiology
780105 Biological sciences
Abstract Two-way N transfers mediated by Pisolithus sp. were examined by excluding root contact and supplying (NH4+)-N-15 or (NO3-)-N-15 to 6-month-old Eucalyptus maculata or Casuarina cunninghamiana grown in two-chambered-pots separated by 37 m screens. Mycorrhizal colonization was 35% in Eucalyptus and 66% in Casuarina (c. 29% N-2-fixation). Using an environmental scanning electron microscope, living hyphae were observed to interconnect Eucalyptus and Casuarina. Biomass and N accumulation was greatest in nodulated mycorrhizal Casuarina/mycorrhizal Eucalyptus pairs, less in nonnodulated mycorrhizal Casuarina/mycorrhizal Eucalyptus pairs, and least in nonnodulated nonmycorrhizal Casuarina/nonmycorrhizal Eucalyptus pairs. In nonnodulated mycorrhizal pairs, N transfers to Eucalyptus or to Casuarina were similar (2.4-4.1 mg per plant in either direction) and were 2.6-4.0 times greater than in nonnodulated nonmycorrhizal pairs. In nodulated mycorrhizal pairs, N transfers were greater to Eucalyptus (5-7 times) and to Casuarina (12-18 times) than in nonnodulated mycorrhizal pairs. Net transfer to Eucalyptus or to Casuarina was low in both nonnodulated nonmycorrhizal (< 0.7 mg per plant) and nonnodulated mycorrhizal pairs (< 1.1 mg per plant). In nodulated mycorrhizal pairs, net transfer to Casuarina was 26.0 mg per plant. The amount and direction of two-way mycorrhiza-mediated N transfer was increased by the presence of Pisolithus sp. and Frankia, resulting in a net N transfer from low-N-demanding Eucalyptus to high-N-demanding Casuarina.
Keyword Plant Sciences
Eucalyptus Maculata
Casuarina Cunninghamiana
(nh4+)-n-15
(no3-)-n-15
Frankia
Pisolithus Sp.
Common Ectomycorrhizal Networks (cmns)
Two-way N Transfer
Arbuscular Mycorrhizal Fungus
Water-stressed Conditions
Trifolium-subterraneum L
Nitrogen Transfer
External Hyphae
Glomus-fasciculatum
Dinitrogen Fixation
Natural-abundance
N-2 Fixation
White Clover
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 03:36:35 EST