Biocontrol activity of salt tolerant<i>Streptomyces</i>isolates against phytopathogens causing root rot of sugar beet

Karimi, Ebrahim; Sadeghi, Akram; Dahaji, Payman Abbaszadeh; Dalvand, Yadola; Omidvari, Mahtab; Nezhad, Mozhdeh Kakuei

doi:10.1080/09583157.2012.658552

Cited by 35 publications

(16 citation statements)

References 45 publications

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“…Sodium chloride test showed that two active isolates of Streptomyces sp. were tolerant in salt environments; this result is similar to Karimi et al (2012) and Jignasha et al (2010). According to the study on the salty soils of Kerman province, these isolates can successfully control the Fusarium spp.…”

Section: Discussionsupporting

confidence: 93%

Isolation and investigation of extracellular metabolites ofStreptomycessp. for biological control ofFusarium subglutinans, the causal agent of wilting cucumber greenhouse

Sadeghy

Hatamy

2013

Archives Of Phytopathology And Plant Protection

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Seventy Streptomyces isolates were obtained from the Rhizosphere and soil of greenhouse and their antagonistic activities against Fusarium subglutinans in dual culture test was studied. Two isolates had antagonistic activities against F. subglutinans. These isolates were tested for determining the antagonistic mechanism effects of extracellular metabolites (such as amylase, protease and lipase). The results exhibited that two isolates of Streptomyces sp. C-11 and C-26 have the ability to produce enzymes, such as amylase, protease and lipase, in vitro.

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Section: Discussionsupporting

confidence: 93%

Isolation and investigation of extracellular metabolites ofStreptomycessp. for biological control ofFusarium subglutinans, the causal agent of wilting cucumber greenhouse

Sadeghy

Hatamy

2013

Archives Of Phytopathology And Plant Protection

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“…Streptomycetes are Gram positive, filamentous bacteria that are excellent saprophytes, prolific producers of extracellular enzymes and ubiquitous in soil and marine sediments (Gontang et al, 2007;Chater et al, 2010). Streptomycetes are the source of many clinically significant antibiotics and have been investigated in agricultural settings for their capacities to suppress plant pathogens (Bressan and Figueiredo, 2007;Hiltunen et al, 2009;Karimi et al, 2012;Kinkel et al, 2012;Meschke et al, 2012;Otto-Hanson et al, 2013). Because of their capabilities at producing bioactive compounds and in response to the tremendous therapeutic value of many of these compounds, antibiotic production in Streptomycetes has been studied extensively in vitro.…”

Section: Introductionmentioning

confidence: 99%

Sympatric inhibition and niche differentiation suggest alternative coevolutionary trajectories among Streptomycetes

et al. 2013

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Soil bacteria produce a diverse array of antibiotics, yet our understanding of the specific roles of antibiotics in the ecological and evolutionary dynamics of microbial interactions in natural habitats remains limited. Here, we show a significant role for antibiotics in mediating antagonistic interactions and nutrient competition among locally coexisting Streptomycete populations from soil. We found that antibiotic inhibition is significantly more intense among sympatric than allopatric Streptomycete populations, indicating local selection for inhibitory phenotypes. For sympatric but not allopatric populations, antibiotic inhibition is significantly positively correlated with niche overlap, indicating that inhibition is targeted toward bacteria that pose the greatest competitive threat. Our results support the hypothesis that antibiotics serve as weapons in mediating local microbial interactions in soil and suggest that coevolutionary niche displacement may reduce the likelihood of an antibiotic arms race. Further insight into the diverse roles of antibiotics in microbial ecology and evolution has significant implications for understanding the persistence of antibiotic inhibitory and resistance phenotypes in environmental microbes, optimizing antibiotic drug discovery and developing strategies for managing microbial coevolutionary dynamics to enhance inhibitory phenotypes.

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“…Although growth inhibition is a common method of evaluating inhibition in many in vitro assays (1,2,9,24,32,34,40), this dependent variable was greatly influenced by differences in growth rate among Pythium isolates (η 2 = 0.51 to 0.56) compared to inhibition zone distance (η 2 = 0.11). Although growth inhibition is a common method of evaluating inhibition in many in vitro assays (1,2,9,24,32,34,40), this dependent variable was greatly influenced by differences in growth rate among Pythium isolates (η 2 = 0.51 to 0.56) compared to inhibition zone distance (η 2 = 0.11).…”

Section: Discussionmentioning

confidence: 99%

“…(3,4,8,9,23,24,29,35,37,48,50). have been used as BCAs against a number of soilborne pathogens, including phytopathogenic Pythium spp.…”

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confidence: 99%

PythiumSpecies and Isolate Diversity Influence Inhibition by the Biological Control AgentStreptomyces lydicus

Weiland

2014

Plant Disease

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Weiland, J. E. 2014. Pythium species and isolate diversity influence inhibition by the biological control agent Streptomyces lydicus. Plant Dis. 98:653-659.Disease control of soilborne pathogens by biological control agents (BCAs) is often inconsistent under field conditions. This inconsistency may be partly influenced by pathogen diversity if there is a differential response among pathogen species and isolates to selected BCAs. The responses of 148 Pythium isolates obtained from soil at three forest nurseries and representative of 16 Pythium spp. were evaluated in the presence of Streptomyces lydicus strain WYEC108 in an in vitro assay. Percent growth inhibition, inhibition zone distance, mortality, and growth rate were recorded for each isolate, and data were analyzed for effects of species and isolate. Responses of three Pythium spp. (Pythium irregulare, P. sylvaticum, and P. ultimum) were further analyzed for a location (nursery) effect. Although S. lydicus inhibited all Pythium isolates, differences in percent growth inhibition, inhibition zone distance, and mortality were observed among Pythium spp. and isolates. Small but significant location effects were also noted. Growth rate also varied among Pythium spp. and isolates and was found to strongly bias percent growth inhibition and, to a lesser degree, inhibition zone distance; depending on which measure was used, slowergrowing isolates appeared less sensitive (growth inhibition) or more sensitive (inhibition zone) to S. lydicus than faster-growing isolates. Results illustrate the importance of using multiple, representative pathogen isolates in preliminary BCA inhibition assays as well as accounting for the effect of pathogen growth rate on pathogen inhibition by BCAs. Future studies should take pathogen diversity into account when evaluating biological control efficacy.

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Biocontrol activity of salt tolerantStreptomycesisolates against phytopathogens causing root rot of sugar beet

Cited by 35 publications

References 45 publications

Isolation and investigation of extracellular metabolites ofStreptomycessp. for biological control ofFusarium subglutinans, the causal agent of wilting cucumber greenhouse

Isolation and investigation of extracellular metabolites ofStreptomycessp. for biological control ofFusarium subglutinans, the causal agent of wilting cucumber greenhouse

Sympatric inhibition and niche differentiation suggest alternative coevolutionary trajectories among Streptomycetes

PythiumSpecies and Isolate Diversity Influence Inhibition by the Biological Control AgentStreptomyces lydicus

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