Rhizobacterium Bacillus amyloliquefaciens Strain SQRT3-Mediated Induced Systemic Resistance Controls Bacterial Wilt of Tomato

Tomato bacterial wilt caused by Ralstonia solanacearum seriously threats tomato growth in tropical and temperate regions around the world.This study reported an antagonistic bacterial strain, Bacillus amyloliquefaciens strain SQRT3, isolated from the rhizosphere soil of tomato plants, which strongly...

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Bibliographic Details
Published in:Pedosphere 2017-12, Vol.27 (6), p.1135-1146
Main Authors: LI, Chunyu, HU, Weicong, PAN, Bin, LIU, Yan, YUAN, Saifei, DING, Yuanyuan, LI, Rong, ZHENG, Xinyan, SHEN, Biao, SHEN, Qirong
Format: Article
Language:English
Subjects:
antagonistic strain
Bacillus amyloliquefaciens
Bacteria
biocontrol
Biological control
defense-related enzymes
defense-related genes
Gene expression
Jasmonic acid
Leaves
Lipid peroxidation
pathogen
Peroxidase
Peroxidation
Phenols
plant disease
Polyphenol oxidase
Ralstonia solanacearum
Rhizosphere
Salicylic acid
Signal transduction
Tomatoes
Wilt
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Summary:Tomato bacterial wilt caused by Ralstonia solanacearum seriously threats tomato growth in tropical and temperate regions around the world.This study reported an antagonistic bacterial strain, Bacillus amyloliquefaciens strain SQRT3, isolated from the rhizosphere soil of tomato plants, which strongly inhibited in vitro growth of pathogenic R.solanacearum.The suppression of tomato bacterial wilt by strain SQRT3 was demonstrated under greenhouse conditions.Additionally, induced systemic resistance（ISR） in tomato as one of the potential disease suppression mechanisms was investigated in the plants inoculated with the isolated bacterial strain SQRT3.The results showed that strain SQRT3 applied with R.solanacearum by drenching significantly reduced tomato bacterial wilt by 68.1% biocontrol efficiency（BE） and suppressed the R.solanacearum populations in the rhizosphere soil compared to the control only drenched with R.solanacearum.The BE of the isolated bacterial strain SQRT3 against tomato wilt increased to 84.1%by root-dipping.Tomato plants treated with both strain SQRT3 and R.solanacearum showed increases in activities of peroxidase and polyphenol oxidase compared with other treatments.The application of strain SQRT3 reduced membrane lipid peroxidation in tomato leaves.The expressions of marker genes for jasmonic acid-and salicylic acid-dependent signaling pathways were faster and stronger in tomato plants treated with both strain SQRT3 and R.solanacearum than in plants treated with either R.solanacearum or strain SQRT3 alone.Collectively, the findings indicated that strain SQRT3 can effectively control tomato wilt.
ISSN:1002-0160
2210-5107
DOI:10.1016/S1002-0160(17)60406-5