Abstract
Native fluorescent pseudomonas bacteria were isolated from rhizosphere soil of mulberry and were evaluated against powdery mildew. In vitro conidial germination study showed significant (P<0.05) variation in conidial germination by bacterial strains Pf1 and Pf3. Mildew incidence was significantly varied due to treatment with various pseudomonas strains in vivo. Significantly (P<0.05) less mildew incidence was in plants treated with the bacterial strain Pf1 (9.11%) followed by Pf3 (13.48%) controlling 69.40% and 54.75% respectively compared with untreated control. Similarly, mildew severity was least (8.51%) in plants treated with strain Pf1 followed by Pf5 (9.23%) and Pf3 (9.72%) controlling the severity by 84.51%, 77.01% and 71.96% respectively compared with control. The bacterial strains significantly influenced biochemical constituents such as chlorophyll, protein and soluble sugar content of the mulberry leaf. Similarly, bacterial strains significantly increased the activity of the peroxidase (PO) and Polyphenol oxydase (PPO) activity from 7th day up to the 28th day after treatment. The strain Pf1 , Pf3 and Pf5 exhibited a marked enhancement in the peroxidase at different periods of infection. Significant (P<0.01) negative correlation was found between powdery mildew severity with phenol content (R2= 0.67) as well as peroxidase (R2= 0.92) and polyphenol oxidase (R2=0.72) activity thus confirms induction of systemic resistance in mulberry by pseudomonas bacteria. The study shows scope for exploration of rhizosphere fluorescent pseudomonas bacteria for induction of systemic resistance in mulberry to contain powdery mildew disease effectively. ⓒ 2017 The Korean Society of Sericultural Sciences Int. J. Indust. Entomol. 35(2), 63-70 (2017)
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Claims 14
Claim · model-written summary
Bacterial strains Pf1 and Pf3 differed significantly in mildew conidial germination in vitro.
Verbatim
e0“In vitro conidial germination study showed significant (P<0.05) variation in conidial germination by bacterial strains Pf1 and Pf3”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Pseudomonas treatments significantly varied mildew incidence in mulberry.
- Taxon
- Mulberryt0
- Treatment
- treatment with various pseudomonas strainse0
- Interactor
- Mildewe0pathogen
- Outcome
- Mildew incidencee0
Not reportedComparatorDirection
Verbatim
e0“Mildew incidence was significantly varied due to treatment with various pseudomonas strains in vivo”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Pf1 reduced mildew incidence to 9.11%, with 69.40% control versus untreated plants.
Verbatim
e0“less mildew incidence was in plants treated with the bacterial strain Pf1 (9.11%) followed by Pf3 (13.48%) controlling 69.40% and 54.75% respectively compared with untreated control”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Pf3 reduced mildew incidence to 13.48%, with 54.75% control versus untreated plants.
Verbatim
e0“less mildew incidence was in plants treated with the bacterial strain Pf1 (9.11%) followed by Pf3 (13.48%) controlling 69.40% and 54.75% respectively compared with untreated control”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Pf1 gave least mildew severity at 8.51%, controlling severity by 84.51%.
Verbatim
e0“mildew severity was least (8.51%) in plants treated with strain Pf1 followed by Pf5 (9.23%) and Pf3 (9.72%) controlling the severity by 84.51%, 77.01% and 71.96% respectively compared with control”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Pf5 gave mildew severity of 9.23%, controlling severity by 77.01%.
Verbatim
e0“mildew severity was least (8.51%) in plants treated with strain Pf1 followed by Pf5 (9.23%) and Pf3 (9.72%) controlling the severity by 84.51%, 77.01% and 71.96% respectively compared with control”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Pf3 gave mildew severity of 9.72%, controlling severity by 71.96%.
Verbatim
e0“mildew severity was least (8.51%) in plants treated with strain Pf1 followed by Pf5 (9.23%) and Pf3 (9.72%) controlling the severity by 84.51%, 77.01% and 71.96% respectively compared with control”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Bacterial strains significantly changed mulberry leaf chlorophyll, protein and soluble sugar.
- Taxon
- mulberrye0
- Treatment
- bacterial strainse0
- Interactor
- bacterial strainse0biocontrol_agent
- Outcome
- chlorophyll, protein and soluble sugar contente0
Not reportedComparatorDirection
Verbatim
e0“The bacterial strains significantly influenced biochemical constituents such as chlorophyll, protein and soluble sugar content of the mulberry leaf”
Claim · model-written summary
Bacterial strains significantly increased peroxidase and polyphenol oxidase activity from day 7 to day 28.
- Taxon
- Mulberryt0
- Treatment
- bacterial strainse0
- Interactor
- bacterial strainse0biocontrol_agent
- Outcome
- peroxidase (PO) and Polyphenol oxydase (PPO) activitye0
- Direction
- increasede0
- Qualifier
- from 7th day up to the 28th day after treatmente0
Not reportedComparator
Verbatim
e0“bacterial strains significantly increased the activity of the peroxidase (PO) and Polyphenol oxydase (PPO) activity from 7th day up to the 28th day after treatment”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Pf1, Pf3 and Pf5 enhanced peroxidase at different infection periods.
- Taxon
- Mulberryt0
- Treatment
- strain Pf1 , Pf3 and Pf5e0
- Interactor
- Pf1 , Pf3 and Pf5e0biocontrol_agent
- Outcome
- peroxidasee0
- Direction
- enhancemente0
- Qualifier
- at different periods of infectione0
Not reportedComparator
Verbatim
e0“The strain Pf1 , Pf3 and Pf5 exhibited a marked enhancement in the peroxidase at different periods of infection”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Mildew severity was negatively correlated with phenol content (R2 0.67).
Verbatim
e0“negative correlation was found between powdery mildew severity with phenol content (R2= 0.67)”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Mildew severity was negatively correlated with peroxidase activity (R2 0.92).
Verbatim
e0“negative correlation was found between powdery mildew severity with phenol content (R2= 0.67) as well as peroxidase (R2= 0.92)”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Mildew severity was negatively correlated with polyphenol oxidase activity (R2 0.72).
Verbatim
e0“negative correlation was found between powdery mildew severity with phenol content (R2= 0.67) as well as peroxidase (R2= 0.92) and polyphenol oxidase (R2=0.72) activity”
t0“Mulberry (Morus spp.)”
Claim · model-written summary
Authors concluded pseudomonas bacteria induce systemic resistance to powdery mildew in mulberry.
Verbatim
e0“confirms induction of systemic resistance in mulberry by pseudomonas bacteria”
t0“Powdery Mildew in Mulberry (Morus spp.)”
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