Rhizoplane colonization of pea seedlings by Rhizobium leguminosarum and a deleterious root colonizing Pseudomonas sp. and effects on plant growth

Some pseudomonads produce a toxin that specifically inhibits winter wheat (Triticum aestivum L.) root growth and the growth of several microorganisms. The toxin does not inhibit pea (Pisum sativum) root growth, but the organisms are aggressive root colonizers and their effect on Rhizobium leguminosa...

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Bibliographic Details
Published in:Plant and soil 1990-04, Vol.123 (1), p.121-124
Main Authors: BOLTON, H., ELLIOTT, L.F., TURCO, R.F., KENNEDY, A.C.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Animal, plant and microbial ecology
Biochemistry and biology
Biological and medical sciences
Chemical, physicochemical, biochemical and biological properties
crecimiento
croissance
Fundamental and applied biological sciences. Psychology
growth
Microbial ecology
Nodules
Peas
Physics, chemistry, biochemistry and biology of agricultural and forest soils
pisum sativum
Plants
Pseudomonas
racine
raices
Rhizobium
Rhizoplane
roots
Short communications
Soil
Soil biochemistry
Soil science
Soil water
Toxins
triticum aestivum
Wheat
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Summary:Some pseudomonads produce a toxin that specifically inhibits winter wheat (Triticum aestivum L.) root growth and the growth of several microorganisms. The toxin does not inhibit pea (Pisum sativum) root growth, but the organisms are aggressive root colonizers and their effect on Rhizobium leguminosarum growth, colonization, and nodulation of peas was not known. Peas were grown in Leonard jars in the greenhouse. Pea roots were inoculated with R. leguminosarum, a toxin-producing Pseudomonas sp., both, or neither (control). The Pseudomonas sp. colonized pea roots more rapidly and in greater number than R. leguminosarum after ten days. In the presence of the Pseudomonas sp., the R. leguminosarum population on the rhizoplane was less at ten days. When the roots were inoculated with both R. leguminosarum and Pseudomonas sp., the number of nodules were greater than when R. leguminosarum was inoculated alone, but nodule dry weight and pea shoot biomass were similar to plants inoculated with only R. leguminosarum. Although these results need confirmation with non-sterile soil and field studies, these preliminary results indicate that peas will not be affected by wheat root-inhibitory rhizobacteria.
ISSN:0032-079X
1573-5036
DOI:10.1007/BF00009936