Rhizoplane colonization of pea seedlings by Rhizobium leguminosarum and a deleterious root colonizing Pseudomonas sp. and effects on plant growth |
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Authors: | H Bolton Jr L F Elliott R F Turco A C Kennedy |
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Institution: | (1) Agricultural Research Service, U.S.D.A., 99164 Pullman, WA, USA;(2) Department of Agronomy, Purdue University, 47907 West Lafayette, IN, USA;(3) Present address: Pacific Northwest Laboratory, 99352 Richland, WA, USA;(4) Present address: Agricultural Research Service, U.S.D.A., 93263 Shafter, CA, USA |
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Abstract: | 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. |
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Keywords: | colonization inhibitory bacteria pea pseudomonads rhizoplane |
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