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Wu X, Qin Y, Li C, Zhang X, Tan X, Liu Y, Chen Y, Zhang D. A novel antifungal peptide, SP1.2, from Rhodopseudomonas palustris against the rice blast pathogen. PEST MANAGEMENT SCIENCE 2024. [PMID: 39180165 DOI: 10.1002/ps.8387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Revised: 08/06/2024] [Accepted: 08/09/2024] [Indexed: 08/26/2024]
Abstract
BACKGROUND Rice blast has a significant detrimental impact on rice yields, so developing efficient biological control technologies is an effective means for rice blast prevention and control. The GroEL protein has proven to be effective at preventing and managing the pathogenicity of rice blast. RESULTS Here, we analyzed the amino acid sequence of the GroEL protein and synthesized the '60 kDa chaperonin signature' (350-373 amino acids) peptide SP1.2, which has potent antifungal activity. Notably, the SP1.2 peptide exhibited potent fungicidal activity against Magnaporthe oryzae, effectively inhibiting appressorium germination. Electron microscopy revealed that SP1.2 disrupted the fungal plasma membrane and bound to multiple bioactive phosphoinositides in vitro, triggering the production of reactive oxygen species. Furthermore, it also caused an increase in the acetylation of M. oryzae and induced autophagy in cells. The spray application of SP1.2 significantly reduced the number of disease spots caused by the fungal pathogen M. oryzae in rice, enhancing the defense response of rice plants. Field trials showed that the control effect was 64.59% after spraying SP1.2. CONCLUSION Our study illustrates the antifungal activity of the structurally unique SP1.2 peptide against plant fungal pathogens and paves the way for the future development of this class of peptides as antifungal agents. © 2024 Society of Chemical Industry.
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Affiliation(s)
- Xiyang Wu
- Long Ping Branch, College of Biology, Hunan University, Changsha, China
- Yuelushan Laboratory and Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha, China
| | - Yingfei Qin
- Long Ping Branch, College of Biology, Hunan University, Changsha, China
- Yuelushan Laboratory and Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha, China
| | - Chenggang Li
- Yuelushan Laboratory and Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha, China
| | - Xin Zhang
- Yuelushan Laboratory and Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha, China
| | - Xinqiu Tan
- Long Ping Branch, College of Biology, Hunan University, Changsha, China
- Yuelushan Laboratory and Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha, China
| | - Yong Liu
- Long Ping Branch, College of Biology, Hunan University, Changsha, China
- Yuelushan Laboratory and Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha, China
| | - Yue Chen
- Long Ping Branch, College of Biology, Hunan University, Changsha, China
- Yuelushan Laboratory and Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha, China
| | - Deyong Zhang
- Long Ping Branch, College of Biology, Hunan University, Changsha, China
- Yuelushan Laboratory and Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha, China
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Zeng Y, Wang M, Yu Y, Wang L, Cui L, Li C, Liu Y, Zheng Y. Rice N-biofertilization by inoculation with an engineered photosynthetic diazotroph. World J Microbiol Biotechnol 2024; 40:136. [PMID: 38499730 DOI: 10.1007/s11274-024-03956-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 03/13/2024] [Indexed: 03/20/2024]
Abstract
Photosynthetic diazotrophs expressing iron-only (Fe-only) nitrogenase can be developed into a promising biofertilizer, as it is independent on the molybdenum availability in the soil. However, the expression of Fe-only nitrogenase in diazotrophs is repressed by the fixed nitrogen of the soil, limiting the efficiency of nitrogen fixation in farmland with low ammonium concentrations that are inadequate for sustainable crop growth. Here, we succeeded in constitutively expressing the Fe-only nitrogenase even in the presence of ammonium by controlling the transcription of Fe-only nitrogenase gene cluster (anfHDGK) with the transcriptional activator of Mo nitrogenase (NifA*) in several different ways, indicating that the engineered NifA* strains can be used as promising chassis cells for efficient expression of different types of nitrogenases. When applied as a biofertilizer, the engineered Rhodopseudomonas palustris effectively stimulated rice growth, contributing to the reduced use of chemical fertilizer and the development of sustainable agriculture.
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Affiliation(s)
- Yan Zeng
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichen West Road, Chaoyang District, Beijing, 100101, China
| | - Mengmei Wang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichen West Road, Chaoyang District, Beijing, 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yunkai Yu
- Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar, 161006, China
| | - Lida Wang
- Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar, 161006, China
| | - Lingwei Cui
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichen West Road, Chaoyang District, Beijing, 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chang Li
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichen West Road, Chaoyang District, Beijing, 100101, China
- College of Agriculture, Shanxi Agricultural University, Jinzhong, 030801, China
| | - Ying Liu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichen West Road, Chaoyang District, Beijing, 100101, China
| | - Yanning Zheng
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No.1 Beichen West Road, Chaoyang District, Beijing, 100101, China.
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Appressoria-Small but Incredibly Powerful Structures in Plant-Pathogen Interactions. Int J Mol Sci 2023; 24:ijms24032141. [PMID: 36768468 PMCID: PMC9917257 DOI: 10.3390/ijms24032141] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/16/2023] [Accepted: 01/18/2023] [Indexed: 01/25/2023] Open
Abstract
Plant-pathogenic fungi are responsible for many of the most severe crop diseases in the world and remain very challenging to control. Improving current protection strategies or designating new measures based on an overall understanding of molecular host-pathogen interaction mechanisms could be helpful for disease management. The attachment and penetration of the plant surface are the most important events among diverse plant-fungi interactions. Fungi evolved as small but incredibly powerful infection structure appressoria to facilitate attachment and penetration. Appressoria are indispensable for many diseases, such as rusts, powdery mildews, and blast diseases, as well as devastating oomycete diseases. Investigation into the formation of plant-pathogen appressoria contributes to improving the understanding of the molecular mechanisms of plant-pathogen interactions. Fungal host attachment is a vital step of fungal pathogenesis. Here, we review recent advances in the molecular mechanisms regulating the formation of appressoria. Additionally, some biocontrol agents were revealed to act on appressorium. The regulation of fungal adhesion during the infective process by acting on appressoria formation is expected to prevent the occurrence of crop disease caused by some pathogenic fungi.
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Wu X, Chen Y, Chen C, Huang Q, Qin Y, Zhang X, Li C, Tan X, Liu Y, Zhang D. Combining the microbial agent Rhodopseudomonas palustris strain PSB-06 with fungicides for controlling rice blast. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2022. [DOI: 10.3389/fsufs.2022.1072156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The rice blast disease caused by Magnaporthe oryzae threatens global rice production yields. Tricyclazole and isoprothiolane are widely used fungicides with high activity against rice blast, and our previous study indicated the photosynthetic bacterium Rhodopseudomonas palustris PSB-06 significantly antagonizes rice blast. However the effect of combining these two chemical fungicides with PSB-06 on rice blast control is unclear. Here we test the control effect of photosynthetic bacteria PSB-06 combined with isoprothiolane and tricyclazole on rice blast. The growth of PSB-06 was unaffected by up to 1.25 mg/L of tricyclazole and 0.3 mg/L of isoprothiolane in the photosynthetic medium, indicated the two fungicides have no inhibition on PSB-06. The control efficiency in the field test reached 76.06% when PSB-06 was combined with isoprothiolane. This value was significantly higher than the individual efficiency of PSB-06 (67.99%) and tricyclazole (65.46%) and the combined control efficiency (72.20%) of those two antifungal agents. Our current findings highlighted the potential of combining R. palustris strain PSB-06 with isoprothiolane to control rice blast, providing environmental protection and reducing the use of fungicides.
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Swain BB, Mohapatra PK, Naik SK, Mukherjee AK. Biopriming for induction of disease resistance against pathogens in rice. PLANTA 2022; 255:113. [PMID: 35503188 DOI: 10.1007/s00425-022-03900-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/11/2022] [Indexed: 06/14/2023]
Abstract
Rice is attacked by an armada of pathogens. Present review provides a critical evaluation of the potential of different biotic agents used to protect rice yield drop from pathogenicity and an account of unexplored areas, which might be taken into consideration to manage rice diseases. Rice (Oryza sativa L.), is the most important staple food of Asian countries. Rice production is significantly limited by a diversity of pathogens, leading to yield loss and deficit in current rice supply. Application of agrochemicals of diverse types has been considered as the only option to control pathogens and enhance rice production, thereby causing environmental concerns and making the pathogens resistant to the active ingredients. Increase in population and resistance of pathogen towards agrochemicals put pressure on the agronomists to search for safe, novel, eco-friendly alternative ways to manage rice pathogens. Inducing resistance in rice by using different biotic/abiotic agents provides an environmental friendly alternative way to effectively manage bacterial, fungal, and viral rice pathogens. In recent years, a number of protocols have been developed for inducing pathogen resistance by bio-priming of rice. However, a comprehensive evaluation of the potential of different biotic agents to protect rice crop loss from pathogens is hitherto lacking due to which the research on induction of defense against pathogens in rice is discontinuous. This review deals with the detailed analysis of the bacterial and fungal agents used to induce defense against rice pathogens, their mode of application, mechanism (physiological, biochemical, and molecular) of defense induction, and effect of defense induction on the yield of rice. It also provides an account of gaps in the research and the unexplored areas, which might be taken into consideration to effectively manage rice pathogens.
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Affiliation(s)
| | | | | | - Arup Kumar Mukherjee
- Molecular Plant Pathology Laboratory, Division of Crop Protection, ICAR-National Rice Research Institute, Cuttack, Odisha, 753006, India.
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Song X, Zhao Q, Zhou A, Wen X, Li M, Li R, Liao X, Xu T. The Antifungal Effects of Citral on Magnaporthe oryzae Occur via Modulation of Chitin Content as Revealed by RNA-Seq Analysis. J Fungi (Basel) 2021; 7:jof7121023. [PMID: 34947005 PMCID: PMC8704549 DOI: 10.3390/jof7121023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/21/2021] [Accepted: 11/26/2021] [Indexed: 12/13/2022] Open
Abstract
The natural product citral has previously been demonstrated to possess antifungal activity against Magnaporthe oryzae. The purpose of this study was to screen and annotate genes that were differentially expressed (DEGs) in M. oryzae after treatment with citral using RNA sequencing (RNA-seq). Thereafter, samples were reprepared for quantitative real-time PCR (RT-qPCR) analysis verification of RNA-seq data. The results showed that 649 DEGs in M. oryzae were significantly affected after treatment with citral (100 μg/mL) for 24 h. Kyoto Encyclopedia of Genes and Genomes (KEGG) and a gene ontology (GO) analysis showed that DEGs were mainly enriched in amino sugar and nucleotide sugar metabolic pathways, including the chitin synthesis pathway and UDP sugar synthesis pathway. The results of the RT-qPCR analysis also showed that the chitin present in M. oryzae might be degraded to chitosan, chitobiose, N-acetyl-D-glucosamine, and β-D-fructose-6-phosphate following treatment with citral. Chitin degradation was indicated by damaged cell-wall integrity. Moreover, the UDP glucose synthesis pathway was involved in glycolysis and gluconeogenesis, providing precursors for the synthesis of polysaccharides. Galactose-1-phosphate uridylyltransferase, which is involved in the regulation of UDP-α-D-galactose and α-D-galactose-1-phosphate, was downregulated. This would result in the inhibition of UDP glucose (UDP-Glc) synthesis, a reduction in cell-wall glucan content, and the destruction of cell-wall integrity.
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Affiliation(s)
- Xingchen Song
- Institute of Crop Protection, Guizhou University, Guiyang 550025, China; (X.S.); (Q.Z.); (A.Z.); (X.W.); (M.L.); (X.L.); (T.X.)
- College of Agriculture, Guizhou University, Guiyang 550025, China
| | - Qijun Zhao
- Institute of Crop Protection, Guizhou University, Guiyang 550025, China; (X.S.); (Q.Z.); (A.Z.); (X.W.); (M.L.); (X.L.); (T.X.)
- College of Agriculture, Guizhou University, Guiyang 550025, China
| | - Aiai Zhou
- Institute of Crop Protection, Guizhou University, Guiyang 550025, China; (X.S.); (Q.Z.); (A.Z.); (X.W.); (M.L.); (X.L.); (T.X.)
- College of Agriculture, Guizhou University, Guiyang 550025, China
| | - Xiaodong Wen
- Institute of Crop Protection, Guizhou University, Guiyang 550025, China; (X.S.); (Q.Z.); (A.Z.); (X.W.); (M.L.); (X.L.); (T.X.)
- College of Agriculture, Guizhou University, Guiyang 550025, China
| | - Ming Li
- Institute of Crop Protection, Guizhou University, Guiyang 550025, China; (X.S.); (Q.Z.); (A.Z.); (X.W.); (M.L.); (X.L.); (T.X.)
- College of Agriculture, Guizhou University, Guiyang 550025, China
- The Provincial Key Laboratory for Agricultural Pest Management in Mountainous Region, Guiyang 550025, China
| | - Rongyu Li
- Institute of Crop Protection, Guizhou University, Guiyang 550025, China; (X.S.); (Q.Z.); (A.Z.); (X.W.); (M.L.); (X.L.); (T.X.)
- College of Agriculture, Guizhou University, Guiyang 550025, China
- The Provincial Key Laboratory for Agricultural Pest Management in Mountainous Region, Guiyang 550025, China
- Correspondence: ; Tel.: +86-151-8514-8063
| | - Xun Liao
- Institute of Crop Protection, Guizhou University, Guiyang 550025, China; (X.S.); (Q.Z.); (A.Z.); (X.W.); (M.L.); (X.L.); (T.X.)
- College of Agriculture, Guizhou University, Guiyang 550025, China
- The Provincial Key Laboratory for Agricultural Pest Management in Mountainous Region, Guiyang 550025, China
| | - Tengzhi Xu
- Institute of Crop Protection, Guizhou University, Guiyang 550025, China; (X.S.); (Q.Z.); (A.Z.); (X.W.); (M.L.); (X.L.); (T.X.)
- College of Agriculture, Guizhou University, Guiyang 550025, China
- The Provincial Key Laboratory for Agricultural Pest Management in Mountainous Region, Guiyang 550025, China
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