期刊
LETTERS IN APPLIED MICROBIOLOGY
卷 68, 期 5, 页码 423-429出版社
WILEY
DOI: 10.1111/lam.13117
关键词
biocontrol; MALDI-TOF MS; P; polymyxa; plant growth promotion; transmission and scanning electron microscopy; X; oryzae pv; oryzae
资金
- Zhejiang Provincial Natural Science Foundation of China [LZ19C140002]
- National Natural Science Foundation of China [31872017, 31571971, 31371904, 31801787]
- Zhejiang Provincial Project [2017C02002, 2018C02G2071267]
- National Key Research and Development Program of China [2017YFD0201104]
- Shanghai Agricultural Basic Research Project [2014:7-3-1]
- Key Scientific Technological Project of Ningbo [2016C11017]
- Fundamental Research Funds for the Central Universities
- Dabeinong Funds for Discipline Development and Talent Training in Zhejiang University
- Key Subject Construction Program of Zhejiang for Modern Agricultural Biotechnology and Crop Disease Control [2010DS700124]
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, bacteriologicaltests 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 invitro and invivo antagonistic activity against Xoo, which may be at least partially attributed to its production of secondary metabolites.
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