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ARS Home » Midwest Area » Columbia, Missouri » Cropping Systems and Water Quality Research » Research » Publications at this Location » Publication #138403
Title: CHARACTERISTICS OF TAKE-ALL DISEASE SUPPRESSIVE RHIZOBACTERIA FROM DIFFERENT SOILS

Author
item NASRAOUI, BOUZID - TUNISIA
item Kremer, Robert

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/7/2002
Publication Date: 11/10/2002
Citation: NASRAOUI, B., KREMER, R.J. CHARACTERISTICS OF TAKE-ALL DISEASE SUPPRESSIVE RHIZOBACTERIA FROM DIFFERENT SOILS. AGRONOMY ABSTRACTS. 2002. CD-ROM (UNPAGINATED). AMERICAN SOCIETY OF AGRONOMY. MADISON, WI.

Interpretive Summary:

Technical Abstract: Root diseases of cereals are problematic because short rotations and no-tillage practices continue in intensive cereal production. Because bacterial biocontrol agents are effective toward root pathogens on entire root systems, we selected rhizobacteria for antagonism against Gaeumannomyces graminis var. tritici (Ggt) in contrasting soils and management systems. Soils with different crop management systems and histories of take-all were collected in Missouri and Tunisia. Bacterial isolates were cultured from wheat rhizospheres and screened against Ggt strains. Fungal inhibition depended on media and supplemental iron. Isolates were tested against Ggt on Madsen wheat seedlings in 'quick test tube assays', using vermiculite, original soil of bacterial isolate or different soils. Three bacterial species were selected based on severe inhibition of take-all disease on wheat roots. In the greenhouse, inhibition of take-all was confirmed for two bacterial species: Pseudomonas aureofaciens from Missouri and Bacillus subtilis from Tunisia effective in original soils. These bacterial cultures are potential biocontrol agents against take-all in soils specific to a wheat-growing region.