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 2004-09-01
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
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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