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Biological control of Phytophthora root rots on alfalfa and soybean with Streptomyces
- Abstract::
- A collection of 53 antibiotic-producing Streptomyces isolated from soils from Minnesota, Nebraska, and Washington were evaluated for their ability to inhibit plant pathogenic Phytophthora medicaginis and Phytophthora sojae in vitro. Eight isolates having the greatest pathogen-inhibitory capabilities were subsequently tested for their ability to control Phytophthora root rots on alfalfa and soybean in sterilized vermiculite and naturally infested field soil. The Streptomyces isolates tested significantly reduced root rot severity in alfalfa and soybean caused by P. medicaginis and P. sojae, respectively (P < 0.05). On alfalfa, isolates varied in their effect on plant disease severity, percentage dead plants, and plant biomass in the presence of the pathogen. The same eight isolates of Streptomyces were also tested for inhibitory activities against each other and against three strains of Bradyrhizobium japonicum and two strains of Sinorhizobium meliloti isolated from soybean and alfalfa, respectively. Streptomyces isolates clustered into two major compatibility groups: isolates within the same group were noninhibitory toward one another in vitro. The compatibility groups corresponded with groupings obtained based upon inhibition of B. japonicum and S. meliloti strains.
- Author(s):
-
Xiao, K. , Kinkel, L.L. , Samac, D.A.
- Subject(s):
-
Medicago sativa , Glycine max , Phytophthora , plant pathogenic fungi , Streptomyces , antibiotics , fungal antagonists , Bradyrhizobium japonicum , Sinorhizobium meliloti , strain differences , seedling growth , biological control agents , biological control , root rot , fungal diseases of plants , disease control , plant diseases and disorders , Phytophthora medicaginis , Phytophthora sojae
- Description:
- Includes references
- Source:
- Biological control : theory and applications in pest management Mar 2002. v. 23 (3)
- Language:
- English
- Year:
- 2002
- Collection:
-
Journal Articles, USDA Authors, Peer-Reviewed
- File:
-
Download [PDF]
- Rights:
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
