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Applied and Environmental Microbiology, May 2002, p. 2161-2171, Vol. 68, No. 5
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.5.2161-2171.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Novel Plant-Microbe Rhizosphere Interaction Involving Streptomyces lydicus WYEC108 and the Pea Plant (Pisum sativum)

Ranjeet K. Tokala,1 Janice L. Strap,1 Carina M. Jung,1 Don L. Crawford,1* Michelle Hamby Salove,1 Lee A. Deobald,1 J. Franklin Bailey,2 and M. J. Morra3

Department of Microbiology, Molecular Biology, and Biochemistry,1 Electron Microscopy Center,2 Soil Science Division, University of Idaho, Moscow, Idaho 83844-30523

Received 4 September 2001/ Accepted 25 January 2002

A previously undescribed plant-microbe interaction between a root-colonizing Streptomyces species, S. lydicus WYEC108, and the legume Pisum sativum is described. The interaction is potentially of great importance to the health and growth in nature of this nodulating legume. The root-colonizing soil actinomycete S. lydicus WYEC108 influences pea root nodulation by increasing root nodulation frequency, possibly at the level of infection by Rhizobium spp. S. lydicus also colonizes and then sporulates within the surface cell layers of the nodules. Colonization leads to an increase in the average size of the nodules that form and improves the vigor of bacteroids within the nodules by enhancing nodular assimilation of iron and possibly other soil nutrients. Bacteroid accumulation of the carbon storage polymer, poly-ß-hydroxybutyrate, is reduced in colonized nodules. Root nodules of peas taken from agricultural fields in the Palouse hills of northern Idaho were also found to be colonized by actinomycete hyphae. We hypothesize that root and nodule colonization is one of several mechanisms by which Streptomyces acts as a naturally occurring plant growth-promoting bacterium in pea and possibly other leguminous plants.

* Corresponding author. Mailing address: 132 Gibb Hall, Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052. Phone: (208) 885-6001. Fax: (208) 885-6518. E-mail: donc{at}uidaho.edu.

Applied and Environmental Microbiology, May 2002, p. 2161-2171, Vol. 68, No. 5
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.5.2161-2171.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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