Plant growth promotion and suppression of bacterial leaf blight in rice by Paenibacillus polymyxa Sx3

Plant growth promotion and suppression of bacterial leaf blight in rice by Paenibacillus polymyxa Sx3

The effects and mechanisms of Paenibacillus polymyxa Sx3 on growth promotion and the suppression of bacterial leaf blight in rice were evaluated in this study. The results from a plate assay indicated that Sx3 inhibited the growth of 20 strains of Xanthomonas oryzae pv. oryzae (Xoo). Rice seedling e...

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Bibliographic Details
Published in:Letters in applied microbiology Vol. 68; no. 5; pp. 423 - 429
Main Authors: Abdallah, Y., Yang, M., Zhang, M., Masum, Md. M.I., Ogunyemi, S.O., Hossain, A., An, Q., Yan, C., Li, B.
Format: Journal Article
Language:English
Published: England Oxford University Press 01-05-2019
Subjects:
Acetic acid
Bacteria
biocontrol
Biofilms
Biological control
Blight
Cell culture
Cell morphology
Cotton
Cytology
Ecological monitoring
Filtrate
In vivo methods and tests
Indoleacetic acid
Leaf blight
Leaves
MALDI‐TOF MS
Metabolites
Morphology
Oryza
P. polymyxa
Paenibacillus polymyxa
Plant growth
plant growth promotion
Plants (botany)
Promotion
Rhizosphere
Rice
Scanning electron microscopy
Secondary metabolites
Seedlings
transmission and scanning electron microscopy
X. oryzae pv. oryzae
MALDI-TOF MS
X. oryzae pv. oryzae
P. polymyxa
biocontrol
plant growth promotion
transmission and scanning electron microscopy
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Summary:The effects and mechanisms of Paenibacillus polymyxa Sx3 on growth promotion and the suppression of bacterial leaf blight in rice were evaluated in this study. The results from a plate assay indicated that Sx3 inhibited the growth of 20 strains of Xanthomonas oryzae pv. oryzae (Xoo). Rice seedling experiments indicated that Sx3 promoted plant growth and suppressed bacterial leaf blight. In addition, bacteriological tests showed that Sx3 was able to fix nitrogen, solubilize phosphate and produce indole acetic acid, indicating that various mechanisms may be involved in the growth promotion by Sx3. The culture filtrate of P. polymyxa Sx3 reduced bacterial growth, biofilm formation and disrupted the cell morphology of Xoo strain GZ 0005, as indicated by the transmission and scanning electron microscopic observations. In addition, MALDI‐TOF MS analysis revealed that Sx3 could biosynthesize two types of secondary metabolites fusaricidins and polymyxin P. In summary, this study clearly indicated that P. polymyxa Sx3 has strong in vitro and in vivo antagonistic activity against Xoo, which may be at least partially attributed to its production of secondary metabolites. Significance and Impact of the Study Antagonistic bacteria can grow well in their originating environment. However, it is unclear whether antagonistic bacteria were able to survive in different ecological environments. This study revealed that Paenibacillus polymyxa Sx3 isolated from rhizosphere soil of cotton significantly promoted the plant growth and suppressed bacterial leaf blight in rice. Therefore, it could be inferred that P. polymyxa Sx3 has the potential to be used as biocontrol agents in plants grown in different ecological environments. Significance and Impact of the Study: Antagonistic bacteria can grow well in their originating environment. However, it is unclear whether antagonistic bacteria were able to survive in different ecological environments. This study revealed that Paenibacillus polymyxa Sx3 isolated from rhizosphere soil of cotton significantly promoted the plant growth and suppressed bacterial leaf blight in rice. Therefore, it could be inferred that P. polymyxa Sx3 has the potential to be used as biocontrol agents in plants grown in different ecological environments.
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ISSN:0266-8254
1472-765X
DOI:10.1111/lam.13117