Occurrence and Transfer of a Biological Factor in Soil that Suppresses Take-all of Wheat in Eastern Washington

Shipton, P. J.

doi:10.1094/phyto-63-511

Cited by 91 publications

(39 citation statements)

References 6 publications

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“…Plants with severe take-all were from plots amended with the same amount of soil from a noncropped (virgin) site adjacent to the wheat monoculture field (center) or no soil (check; far left). Take-all was uniformly severe in the first wheat crop, and take-all decline occurred uniformly throughout the experimental site in the third wheat crop, regardless of the one-time initial soil amendment (18).…”

Section: Take-all Decline: An Isolated Phenomenon or Source Of Clues mentioning

confidence: 92%

“…The development of a soil microbiotia suppressive to take-all in response to monoculture wheat in Dutch polder soils was confirmed in the U.S. Pacific Northwest for virgin desert soils brought into wheat production with irrigation, as part of the U.S. Department of Interior Columbia Basin Land Reclamation Project (18,19). To test the hypothesis that the suppressiveness was transferable (19), soil from a field cropped each of the previous 12 years to irrigated wheat (with no evidence of take-all, although the disease was common in other fields within the area) from near Quincy, WA, in the irrigated Columbia Basin.…”

Section: Take-all Decline: An Isolated Phenomenon or Source Of Clues mentioning

confidence: 93%

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Toward cropping systems that enhance productivity and sustainability

2006

Proc. Natl. Acad. Sci. U.S.A.

138

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The defining features of any cropping system are (i) the crop rotation and (ii) the kind or intensity of tillage. The trend worldwide starting in the late 20th century has been (i) to specialize competitively in the production of two, three, a single, or closely related crops such as different market classes of wheat and barley, and (ii) to use direct seeding, also known as no-till, to cut costs and save soil, time, and fuel. The availability of glyphosate-and insect-resistant varieties of soybeans, corn, cotton, and canola has helped greatly to address weed and insect pest pressures favored by direct seeding these crops. However, little has been done through genetics and breeding to address diseases caused by residue-and soil-inhabiting pathogens that remain major obstacles to wider adoption of these potentially more productive and sustainable systems. Instead, the gains have been due largely to innovations in management, including enhancement of root defense by antibiotic-producing rhizosphere-inhabiting bacteria inhibitory to root pathogens. Historically, new varieties have facilitated wider adoption of new management, and changes in management have facilitated wider adoption of new varieties. Although actual yields may be lower in direct-seed compared with conventional cropping systems, largely due to diseases, the yield potential is higher because of more available water and increases in soil organic matter. Achieving the full production potential of these more-sustainable cropping systems must now await the development of varieties adapted to or resistant to the hazards shown to account for the yield depressions associated with direct seeding.

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Section: Take-all Decline: An Isolated Phenomenon or Source Of Clues mentioning

confidence: 92%

Section: Take-all Decline: An Isolated Phenomenon or Source Of Clues mentioning

confidence: 93%

Toward cropping systems that enhance productivity and sustainability

2006

Proc. Natl. Acad. Sci. U.S.A.

138

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“…tritici attacks the roots of wheat and barley, causing the disease take-all (1,8). Continuous cropping of wheat in fields that have take-all results in a gradual decline in the incidence and severity of the disease, a phenomenon called take-all decline (TAD) (1,10,27). The production of phloroglucinol derivatives by phlDcontaining (phlD ϩ ) Pseudomonas strains plays an important role in TAD (18,19,24).…”

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confidence: 99%

Genotypic and Phenotypic Diversity of phlD -Containing Pseudomonas Strains Isolated from the Rhizosphere of Wheat

Gardener

Schroeder

Kalloger

et al. 2000

Appl Environ Microbiol

127

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Production of 2,4-diacetylphloroglucinol (2,4-DAPG) in the rhizosphere by strains of fluorescent Pseudomonas spp. results in the suppression of root diseases caused by certain fungal plant pathogens. In this study, fluorescent Pseudomonas strains containing phlD, which is directly involved in the biosynthesis of 2,4-DAPG, were isolated from the rhizosphere of wheat grown in soils from wheat-growing regions of the United States and The Netherlands. To assess the genotypic and phenotypic diversity present in this collection, 138 isolates were compared to 4 previously described 2,4-DAPG producers. Thirteen distinct genotypes, one of which represented over 30% of the isolates, were differentiated by whole-cell BOX-PCR. Representatives of this group were isolated from eight different soils taken from four different geographic locations. ERIC-PCR gave similar results overall, differentiating 15 distinct genotypes among all of the isolates. In most cases, a single genotype predominated among isolates obtained from each soil. Thirty isolates, representing all of the distinct genotypes and geographic locations, were further characterized. Restriction analysis of amplified 16S rRNA gene sequences revealed only three distinct phylogenetic groups, one of which accounted for 87% of the isolates. Phenotypic analyses based on carbon source utilization profiles revealed that all of the strains utilized 49 substrates and were unable to grow on 12 others. Individually, strains could utilize about two-thirds of the 95 substrates present in Biolog SF-N plates. Multivariate analyses of utilization profiles revealed phenotypic groupings consistent with those defined by the genotypic analyses.

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“…Soil suppressiveness may be established or lost over a long timeframe 15) , or even transferred to conducive soils 61) . Many examples of suppressive soil have been described 9,14) .…”

Section: Growth and Death In Bacterial Communitiesmentioning

confidence: 99%

Suppression of Soilborne Plant Pathogens through Community Evolution of Soil Microorganisms.

Fukui

2003

Microb. Environ.

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A distinct microbial community is established in a given environment as a consequence of the community evolution of individual component microorganisms. According to the "Community Theory", microorganisms proliferate not as individual species but as a community in response to changes in the environment, evolving into a biological network that is most suitable for their survival and/or further growth. During this process, individual microorganisms interact and communicate with each other by sharing their limited genetic information in order to exploit available resources. Consequently, a functional community comprising many different species is formed. Such microbial communities are comparable to multi-cellular organisms in many ways, but often too complex to be characterized. Nutrient enrichment is one approach to the study of the functions of these inextricably linked biological networks. For soil microbial communities, amendment with organic matter can be employed to apply selective environmental advantages in order to transfer microbial communities to newly evolved biological consortia with distinctive functions. Many studies have reported that the incorporation of composts or green manures rendered soils suppressive to various soilborne pathogens. Among the pathogens that are controlled effectively are Pythium, Phytophthora, and Rhizoctonia. Soil enrichment with organic matter may be the most fundamental and sustainable approach to the biological control of soilborne diseases.

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Occurrence and Transfer of a Biological Factor in Soil that Suppresses Take-all of Wheat in Eastern Washington

Cited by 91 publications

References 6 publications

Toward cropping systems that enhance productivity and sustainability

Toward cropping systems that enhance productivity and sustainability

Genotypic and Phenotypic Diversity of phlD -Containing Pseudomonas Strains Isolated from the Rhizosphere of Wheat

Suppression of Soilborne Plant Pathogens through Community Evolution of Soil Microorganisms.

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