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Publication Type J
Authors Baker, A., J. I. Sprent and J. Wilson
Title Effects of Sodium-Chloride and Mycorrhizal Infection on the Growth and Nitrogen-Fixation of Prosopis-Juliflora
Source Symbiosis
Author Keywords prosopis juliflora nodule nitrogen fixation salinity mycorrhiza glomus rhizobium chemical-composition anatomical changes nacl salinity rhizobium fungi tolerance leucaena plants acacia
Abstract Prosopis juliflora (Swartz) DC seedlings were inoculated with a rhizobial broth (strain DUS337); half were also inoculated with arbuscular mycorrhizal (AM) fungi. Four sodium chloride (NaCl) treatments (0, 0.15, 0.3, and 0.6 M NaCl) were applied weekly, from 24 hrs after inoculation until the time of harvesting. The experiment ran for 6 weeks. Growth, nodulation, N-2 fixation and AM infection were measured. As NaCl concentration increased, plant dry mass, nodule dry mass and AM infection decreased. Nodulation ceased between 0.3 and 0.6 M NaCl, and AM infection between 0.15 and 0.3 M NaCl. Without NaCl, nodule dry mass was 56% greater in AM plants than non-AM plants. Nitrogen fixation, measured by the different techniques of N-15 dilution, acetylene reduction and total N content, showed comparable results. Overall N-2 fixation showed a similar pattern to that of nodulation. delta(13)C values became less negative with increasing NaCl concentration, indicating a possible increase in water-use efficiency of plants grown in high NaCl concentrations.
Author Address INST TERR ECOL,PENICUIK EH26 0QB,MIDLOTHIAN,SCOTLAND. BAKER, A, UNIV DUNDEE,DEPT BIOL SCI,DUNDEE DD1 4HN,SCOTLAND.
Year Published 1995
Volume 19
Issue 1
Beginning Page 39-51
Unique Article Identifier ISI:A1995TF72400003
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