Nutrient and growth interactions in soybeans colonized with Glomus fasciculatum and Rhizobium japonicum

Glycine max (L. Merr. cv. Amsoy 71) plants were grown in a greenhouse in a sand/perlite medium low in plant-available N and P. Plants were either inoculated with a vesiculararbuscular mycorrhizal (VAM) fungus alone, a strain of Rhizobium japonicum alone, both endophytes together or were left non-ino...

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Bibliographic Details
Published in:Plant and soil 1986-01, Vol.92 (1), p.37-45
Main Authors: PACOVSKY, R.S., FULLER, G., STAFFORD, A.E., PAUL, E.A.
Format: Article
Language:English
Subjects:
Agronomy
Agronomy. Soil science and plant productions
Biological and medical sciences
Biotechnology
Economic plant physiology
Fundamental and applied biological sciences. Psychology
Fungi
General agronomy. Plant production
Industrial applications and implications. Economical aspects
Inoculation
Leaf area
Nodulation
Nodules
Plant interaction
Plant roots
Plants
Rhizobium
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Soybeans
Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)
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Summary:Glycine max (L. Merr. cv. Amsoy 71) plants were grown in a greenhouse in a sand/perlite medium low in plant-available N and P. Plants were either inoculated with a vesiculararbuscular mycorrhizal (VAM) fungus alone, a strain of Rhizobium japonicum alone, both endophytes together or were left non-inoculated to serve as a control. All combinations received a N- and P-free nutrient solution. Nodulated plants contained 4 to 5 times the phytomass of non-inoculated controls, and plants colonized with both the VAM fungus and Rhizobium were 18% greater in dry weight than nodulated, non-VAM plants due to a positive VAM times Rhizobium interaction. Nitrogen fixation, calculated from C₂H₄ and H₂ data, was significantly higher in the tripartite symbiosis, with 80% of the increase attributable to increased nodule mass and 20% due to increases in specific nodule activity. Colonization by the VAM fungus and the development of vesicles increased significantly following nodulation. The synergistic interactions between the microsymbionts suggests that the response of the host to dual colonization is complex and depends on a balance between the three members of the symbiosis.
ISSN:0032-079X
1573-5036
DOI:10.1007/BF02372264