Induction of Defense Response Against Rhizoctonia solani in Cucumber Plants by Endophytic Bacterium Bacillus thuringiensis GS1

Seo, Dong‐Jun; Nguyen, Dang-Minh-Chanh; Song, Yuanlin; Jung, Woo‐Jin

doi:10.4014/jmb.1107.07027

Cited by 34 publications

(12 citation statements)

References 49 publications

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“…The influence of various strains of Bt on the patho genic fungus R. solani was studied by other authors in the treatment of cucumber seeds and their subsequent germination in pots (Seo et al, 2012) and in the case of treatment of chili peppers and the subsequent observation of seedlings in Petri dishes (Mojica Marin et al, 2008). In both cases the strains of Bt inhibited the development of the causal agent of rhizoctoniosis and stimulated plant growth.…”

Section: Resultsmentioning

confidence: 99%

Ecological interactions in the system: Entomopathogenic bacterium Bacillus thuringiensis—phytopathogenic fungus Rhizoctonia solani—host plant Solanum tuberosum

Bakhvalov

Tsvetkova

Shpatova

et al. 2015

Contemp. Probl. Ecol.

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The mutual functional dependence in the three component system Bacillus thuringiensis-Rhizoc tonia solani-Solanum tuberosum is shown. Suppression of the rhizoctonia potato disease due to the treatment of tubers with entomopathogenic bacteria Bacillus thuringiensis subsp. Darmstadiensis (BtH 10 ) is demon strated. In vitro inhibitory activity of BtH 10 towards R. solani exceeded 80%. Field testing is carried out on two potato cultivars of different ripeness groups in 2013-2014. The rhizoctonia disease severity in stems, stolons, and new tubers decreases significantly due to BtH 10 treatment. Together with biological control of R. solani, BtH 10 promoted plant growth, increasing germinating capacity and stem height and number. The polyfunc tional activity of the BtH 10 bacteria contributes to the improvement of potato productivity. Fig. 3. Height of plants (LSD 05 by strain and cultivar = 1.5) and number of stems per potato plant (LSD 05 by strain and cultivar = 0.25) on average for 2 years. (1) Lyubava cultivar; (2) Lugovskoy cultivar; (a) control; (b) treatment of tubers with BtH 10 .

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Section: Resultsmentioning

confidence: 99%

Ecological interactions in the system: Entomopathogenic bacterium Bacillus thuringiensis—phytopathogenic fungus Rhizoctonia solani—host plant Solanum tuberosum

Bakhvalov

Tsvetkova

Shpatova

et al. 2015

Contemp. Probl. Ecol.

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“…Additionally, Bt strains may exhibit biocontrol activity against fungal (Sadfi et al ., ; Gomaa, ) and bacterial (Dong et al ., ) phytopathogens. Different biocontrol mechanisms have been described in Bt, such as siderophore production (Raddadi et al ., ; de Goes et al ., ), quorum quenching (Park et al ., ), production of chitinases (Gomaa, ) or induction of plant systemic resistance (Seo et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Bacillus thuringiensiscolonises plant roots in a phylogeny-dependent manner

Vidal-Quist

Rogers

Mahenthiralingam

et al. 2013

FEMS Microbiol Ecol

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Although much is known about the pathology of Bacillus thuringiensis against invertebrates, current understanding of its natural ecology is limited. This study evaluated the biodiversity of B. thuringiensis in relation to its interaction with plants. Phylogenetic relationships between 44 reference and field-collected strains, determined using 16S rRNA and gyrB gene sequences, revealed a high degree of variability, similar to that found in databases. An Arabidopsis thaliana in vitro inoculation model was developed to screen the ability of B. thuringiensis to colonise roots. Significant colonisation differences up to 91-fold were observed between strains, and correlation between strain phylogeny and colonisation was found. The genetics and biochemistry of auxin production; presence of the gene encoding indole pyruvate decarboxylase; and the abilities of Bt strains to swarm, grow in rich/minimal media and affect root growth differed between the strains, but only auxin production correlated significantly with ability to colonise roots. Co-inoculation with Burkholderia phytofirmans PsJN or Pseudomonas fluorescens SBW25 produced no effect on B. thuringiensis colonisation levels, regardless of the co-inoculant. Similarly, root colonisation of A. thaliana mutants impaired in plant defences was not significantly higher compared with controls. This is the first systematic and phylogenetic evaluation of B. thuringiensis interaction with plants.

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“…Three days later at 25°C disease severity was assayed either visually or by determination of PPO activity in the most five injuries cotyledons since PPO activity is increased in Rhizoctonia diseased hosts (Stackwell and Hanchey, 1987;Seo et al, 2012). Data obtained indicated that starvation of R. solani led to great increase of its aggressiveness, and this increasing of aggressiveness was increased more than an increase of starvation.…”

Section: Discussionmentioning

confidence: 99%

Behavior of fungus Rhizoctonia solani under faba bean cotyledons when away from host and the effect of its starvation on aggressiveness

Mohamed¹,

M²,

H³

et al. 2014

J. Yeast Fungal Res.

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Behavior of Rhizoctonia solani on their hosts was carried out-in many studies when the pathogen was in close proximity with its host. The purpose of this study was focused on the behavior of this fungus on faba bean cotyledons when it was away from the host and the effect of nutritional status on its pathogenicity was also taken into consideration. Observations led to speculation that R. solani feels its host even when it was away from it and begins to assemble its strength to grow toward the host then start to form its pathogenic structures when it reach it. Scanning electron microscopic (SEM) observations which was carried out after 24, 48 and 72 h from exposing the pathogen to the host when the fungus was away from it revealed that when the hyphal pathogen feel the host, they swell and some hyphae begin to differentiate and appear very thick, forming likelihood mycelial strands and such hyphae grow vigorously and vertically toward the host. Starvation of the pathogen was found to be vital factor in R. solani pathogencity. Growing of the fungus on water ager led to dramatic increase in the pathogen. This strength was confirmed by visual determination of disease severity and by determination of polyphenol oxidase activity in infected cotyledons. These results exclude the role of host exudates in the attraction of the R. solani toward its host.

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Induction of Defense Response Against Rhizoctonia solani in Cucumber Plants by Endophytic Bacterium Bacillus thuringiensis GS1

Cited by 34 publications

References 49 publications

Ecological interactions in the system: Entomopathogenic bacterium Bacillus thuringiensis—phytopathogenic fungus Rhizoctonia solani—host plant Solanum tuberosum

Ecological interactions in the system: Entomopathogenic bacterium Bacillus thuringiensis—phytopathogenic fungus Rhizoctonia solani—host plant Solanum tuberosum

Bacillus thuringiensiscolonises plant roots in a phylogeny-dependent manner

Behavior of fungus Rhizoctonia solani under faba bean cotyledons when away from host and the effect of its starvation on aggressiveness

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