ARS | Publication request: SIGNIFICANCE OF HOST GENOTYPE IN EXPLOITATION OF RESIDENT DISEASE SUPPRESSIVE SOIL MICROBIAL COMMUNITIES

Submitted to: Phytopathology
Publication Type: Proceedings
Publication Acceptance Date: February 1, 2004
Publication Date: June 1, 2004
Citation: Mazzola, M., Gu, Y.H., Funnell, D., Cohen, M.F., Raaijmakers, J.M. 2004. Significance of host genotype in exploitation of resident disease suppressive soil microbial communities. Phytopathology. 94:S125.

Technical Abstract: Impact of plant genotype on plant microbe interactions has been widely examined in the realm of plant pathogenic organisms. Consideration of host specificity in interactions between plants and resident non-symbiotic plant-beneficial soil microorganisms has received decidedly less attention. The capacity of wheat to modify composition of the fluorescent pseudomonad population resident to orchard soils was found to vary in a cultivar-specific manner, and was associated with development of soil suppressiveness toward Rhizoctonia solani AG-5 and AG-8, pathogens of apple and wheat, respectively. Wheat genotypes also varied in the capacity to select, both qualitatively and quantitatively, for resident populations of 2,4-DAPG-producing fluorescent Pseudomonas spp., which have a pivotal role in the development of take-all decline. Apple rootstocks varied in the ability to support antagonistic pseudomonad genotypes enhanced through wheat cultivation and populations of resident Streptomyces spp. promoted by canola seed meal amendment. These findings implicate the importance of host genotype in optimizing use of resident soil microorganisms for disease suppression.