Journal ArticleDOI
Effects on winter wheat seedling growth by toxin-producing rhizobacteria
J. K. Fredrickson,L. F. Elliott +1 more
TLDR
Root-colonizing pseudomonads capable of inhibiting seedling winter wheat root growth in an agar seedling bioassay also significantly inhibited wheatroot growth in vermiculite, providing further evidence that a toxin, produced by these organisms, is involved in growth retardation.Abstract:
Root-colonizing pseudomonads capable of inhibiting seedling winter wheat (Triticum aestivum L.) root growth in an agar seedling bioassay also significantly inhibited wheat root growth in vermiculite; however, the inhibitory trait is quite labile in laboratory culturing. The extent of inhibition in both the agar and vermiculite medium depended on inoculum level. These pseudomonads were found to produce a toxin capable of inhibiting growth ofEscherichia coli C-la andBacillus subtilis. Field isolates that strongly inhibit growth of indicator bacteria also inhibited root growth. Toxin production by the bacteria appeared necessary for inhibition of root growth and indicator bacteria as toxin-negative (TOX−) mutants no longer inhibited either. Antibiosis towardsE. coli as well as wheat seedling root inhibition in agar was reversed by L-methionine, providing further evidence that a toxin, produced by these organisms, is involved in growth retardation.read more
Citations
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Journal ArticleDOI
Bacterial Endophytes: Potential Role in Developing Sustainable Systems of Crop Production
TL;DR: Bacterial endophytes have been implicated in supplying biologically fixed nitrogen in non-legumes, and these associations can increase the nitrogen economy of a crop, reducing the requirement for N fertilizers.
Journal ArticleDOI
Interactions of Deleterious and Beneficial Rhizosphere Microorganisms and the Effect of Cropping Practices
TL;DR: Recent knowledge on deleterious and beneficial rhizosphere bacteria, their interactions, and their effect on yield as related to cropping practices are reviewed.
Journal ArticleDOI
A review: long-term effects of agricultural systems on soil biochemical and microbial parameters
TL;DR: A review of recent developments on assessing the effect of agricultural systems on long-term productivity of soils is provided in this paper, which reaffirms the continuing need for the maintenance of existing longterm experimental sites and establishment of new studies in major agroecosystems throughout the world.
Book ChapterDOI
The rhizosphere and its management to improve plant growth
G.D. Bowen,A.D. Rovira +1 more
TL;DR: The chapter describes plant responses, the nature and dynamics of rhizosphere populations and their determinants, the management of the plant, and management of microorganisms, and explores the impact of soil conditions and agronomic practices on the rhizoshere microflora.
Journal ArticleDOI
Managing Soil Microorganisms to Improve Productivity of Agro-Ecosystems
TL;DR: In this paper, a review of the literature examining the manipulation of microbial populations as linked to agricultural production, and discusses new approaches that involve the precision management of microorganisms in the agro-ecosystem is presented.
References
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Journal ArticleDOI
Effects of rhizosphere colonization by plant growth-promoting rhizobacteria on potato plant development and yield.
Journal ArticleDOI
Disease-Suppressive Soil and Root-Colonizing Bacteria
TL;DR: The biological characteristics of these soil-bome root epiphytes, their contribution to plant health, and their potential use in biotechnology are addressed.
Journal ArticleDOI
Suppression of take-all of wheat by seed treatments with fluorescent pseudomonads.
D. M. Weller,R. J. Cook +1 more
TL;DR: Howell and three, or possibly more consecutive crops of wheat after alfalfa or Stipanovic (7,8) demonstrated that strains of Pseudomonas potatoes, to help eliminate soilborne pathogens of those crops.
Journal ArticleDOI
Seed and Root Bacterization
TL;DR: Questions are questioned whether the claims of large increases in yield were justified, for much of the early data had not been analyzed statistically, and positive significant effects occurred in about one third of the trials, and an increase of 10% was almost within the limits of experimental error.
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