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Liang M, Feng A, Wang C, Zhu X, Su J, Xu Z, Yang J, Wang W, Chen K, Chen B, Lin X, Feng J, Chen S. Bacillus amyloliquefaciens LM-1 Affects Multiple Cell Biological Processes in Magnaporthe oryzae to Suppress Rice Blast. Microorganisms 2024; 12:1246. [PMID: 38930628 PMCID: PMC11205629 DOI: 10.3390/microorganisms12061246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2024] [Revised: 06/16/2024] [Accepted: 06/17/2024] [Indexed: 06/28/2024] Open
Abstract
Magnaporthe oryzae, one of the most destructive rice pathogens, causes significant losses during the rice harvest every year. Bacillus amyloliquefaciens has been explored in many crops as a potential biocontrol agent. However, the mechanisms of B. amyloliquefaciens controled rice blast are not fully understood. Here, a biocontrol strain LM-1, isolated from a contaminated medium, was identified as B. amyloliquefaciens using morphological observation, physiological and biochemical tests, and 16S rDNA sequencing. LM-1 inhibited the growth and pathogenicity of M. oryzae and Bipolaris oryzae (Breda de Haan) Shoem. The mycelia of M. oryzae co-cultured with LM-1 were enlarged and broken by fluorescence microscopy using calcofluor white. LM-1 inhibited the mycelia of M. oryzae from producing conidia. Genes itu, srf, and fenB were detected in LM-1. Furthermore, the supernatant of LM-1 interfered with the appressorium formation of M. oryzae, blocked conidial cell death, and reduced autophagy degradation but did not affect the normal germination of rice seeds and seeding growth. Additionally, we observed hypersensitivity reactions, reactive oxygen species, and iron accumulation reduction in rice cells inoculated with supernatant. Our study reveals that LM-1 has a control effect on rice blast and affects cell wall integrity, sporulation, appressorium formation, cell death, and autophagy.
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Affiliation(s)
- Meiling Liang
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
| | - Aiqing Feng
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
| | - Congying Wang
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
| | - Xiaoyuan Zhu
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
| | - Jing Su
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
| | - Zihan Xu
- School of Life Sciences, South China Normal University, Guangzhou 510631, China;
| | - Jianyuan Yang
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
| | - Wenjuan Wang
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
| | - Kailing Chen
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
| | - Bing Chen
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
| | - Xiaopeng Lin
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
| | - Jinqi Feng
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
| | - Shen Chen
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; (M.L.); (A.F.); (C.W.); (X.Z.); (J.S.); (J.Y.); (W.W.); (K.C.); (B.C.); (X.L.); (J.F.)
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Pengproh R, Thanyasiriwat T, Sangdee K, Saengprajak J, Kawicha P, Sangdee A. Evaluation and Genome Mining of Bacillus stercoris Isolate B.PNR1 as Potential Agent for Fusarium Wilt Control and Growth Promotion of Tomato. THE PLANT PATHOLOGY JOURNAL 2023; 39:430-448. [PMID: 37817491 PMCID: PMC10580056 DOI: 10.5423/ppj.oa.01.2023.0018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 08/07/2023] [Accepted: 08/26/2023] [Indexed: 10/12/2023]
Abstract
Recently, strategies for controlling Fusarium oxysporum f. sp. lycopersici (Fol), the causal agent of Fusarium wilt of tomato, focus on using effective biocontrol agents. In this study, an analysis of the biocontrol and plant growth promoting (PGP) attributes of 11 isolates of loamy soil Bacillus spp. has been conducted. Among them, the isolates B.PNR1 and B.PNR2 inhibited the mycelial growth of Fol by inducing abnormal fungal cell wall structures and cell wall collapse. Moreover, broad-spectrum activity against four other plant pathogenic fungi, F. oxysporum f. sp. cubense race 1 (Foc), Sclerotium rolfsii, Colletotrichum musae, and C. gloeosporioides were noted for these isolates. These two Bacillus isolates produced indole acetic acid, phosphate solubilization enzymes, and amylolytic and cellulolytic enzymes. In the pot experiment, the culture filtrate from B.PNR1 showed greater inhibition of the fungal pathogens and significantly promoted the growth of tomato plants more than those of the other treatments. Isolate B.PNR1, the best biocontrol and PGP, was identified as Bacillus stercoris by its 16S rRNA gene sequence and whole genome sequencing analysis (WGS). The WGS, through genome mining, confirmed that the B.PNR1 genome contained genes/gene cluster of a nonribosomal peptide synthetase/polyketide synthase, such as fengycin, surfactin, bacillaene, subtilosin A, bacilysin, and bacillibactin, which are involved in antagonistic and PGP activities. Therefore, our finding demonstrates the effectiveness of B. stercoris strain B.PNR1 as an antagonist and for plant growth promotion, highlighting the use of this microorganism as a biocontrol agent against the Fusarium wilt pathogen and PGP abilities in tomatoes.
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Affiliation(s)
- Rattana Pengproh
- Department of Biology, Faculty of Science, Mahasarakham University, Maha Sarakham 44150, Thailand
| | - Thanwanit Thanyasiriwat
- Plant Genome and Disease Research Unit, Department of Agriculture and Resources, Faculty of Natural Resources and Agro-Industry, Kasetsart University Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon 47000, Thailand
| | - Kusavadee Sangdee
- Preclinical Group, Faculty of Medicine, Mahasarakham University, Muang District, Maha Sarakham 44000, Thailand
| | - Juthaporn Saengprajak
- Department of Biology, Faculty of Science, Mahasarakham University, Maha Sarakham 44150, Thailand
| | - Praphat Kawicha
- Plant Genome and Disease Research Unit, Department of Agriculture and Resources, Faculty of Natural Resources and Agro-Industry, Kasetsart University Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon 47000, Thailand
| | - Aphidech Sangdee
- Department of Biology, Faculty of Science, Mahasarakham University, Maha Sarakham 44150, Thailand
- Microbiology and Applied Microbiology Research Unit, Faculty of Science, Mahasarakham University, Kantarawichai District, Maha Sarakham 44150, Thailand
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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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