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Zhang Z, Chen T, Yin X, Wang W, Li W, Chen X, Ma J, Long Y. Honokiol inhibits Botryosphaeria dothidea, the causal pathogen of kiwifruit soft rot, by targeting membrane lipid biosynthesis. PEST MANAGEMENT SCIENCE 2024; 80:1779-1794. [PMID: 38031205 DOI: 10.1002/ps.7910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 10/23/2023] [Accepted: 11/30/2023] [Indexed: 12/01/2023]
Abstract
BACKGROUND Kiwifruit soft rot is mainly caused by Botryosphaeria dothidea, representing a considerable threat to kiwifruit industry. This investigation assessed the inhibitory consequences and mechanisms of honokiol against B. dothidea, evaluating the inhibitory effects and underlying mechanism. RESULTS A strain of B.dothidea (XFCT-2) was isolated from infected soft rot kiwifruit. The findings indicate that honokiol hindered the mycelial growth, conidial germination, and pathogenicity of B. dothidea in a dose-dependent manner, both in vitro and in vivo. Furthermore, ultrastructural examinations showed that honokiol impaired the integrity of B. dothidea, leading to an elevation in cell membrane permeability, engendering a multitude of intracellular substance extravasations and hampering energy metabolism. Transcriptome analysis exhibited that honokiol-regulated genes were related to membrane lipid biosynthesis, comprising ACC1, FAS2, Arp2, gk, Cesle, and Etnk1. These findings indicate that honokiol impedes B. dothidea by obstructing lipid biosynthesis within the cell membrane and compromising its integrity, halting the growth of the mycelia, which could potentially cause cellular demise. CONCLUSION This investigation illustrates how honokiol functions as an eco-friendly approach to prevent the occurrence of soft rot in kiwifruits. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Zhuzhu Zhang
- Research Center for Engineering Technology of Kiwifruit, Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang, China
- Teaching Experiment Farm, Guizhou University, Guiyang, China
| | - Tingting Chen
- Research Center for Engineering Technology of Kiwifruit, Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang, China
- Teaching Experiment Farm, Guizhou University, Guiyang, China
| | - Xianhui Yin
- Research Center for Engineering Technology of Kiwifruit, Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang, China
| | - Weizhen Wang
- Research Center for Engineering Technology of Kiwifruit, Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang, China
| | - Wenzhi Li
- Research Center for Engineering Technology of Kiwifruit, Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang, China
| | - Xuetang Chen
- Research Center for Engineering Technology of Kiwifruit, Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang, China
| | - Jiling Ma
- Research Center for Engineering Technology of Kiwifruit, Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang, China
| | - Youhua Long
- Research Center for Engineering Technology of Kiwifruit, Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang, China
- Teaching Experiment Farm, Guizhou University, Guiyang, China
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Farrell MV, Airkin MY, Ali TN, Altoblani ZS, Bowman CR, Diaz AAB, Faurot PF, Frausto JE, Haji SF, Hamad BA, Lively JB, Luistro DCC, Macias Y, Mathew S, McKinley KM, Nasirimoseloo S, Tran BP, Trinh AN, Shikuma NJ. Draft genome sequence of Exiguobacterium sp. strain MMG028 isolated from a salt marsh. Microbiol Resour Announc 2024; 13:e0011623. [PMID: 38358284 DOI: 10.1128/mra.00116-23] [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: 02/15/2023] [Accepted: 01/29/2024] [Indexed: 02/16/2024] Open
Abstract
Here, we report the draft genome sequence of Exiguobacterium sp. strain MMG028, isolated from Rose Creek, San Diego, CA, USA, assembled and analyzed by undergraduate students participating in a marine microbial genomics course. A genomic comparison suggests that MMG028 is a novel species, providing a resource for future microbiology and biotechnology investigations.
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Affiliation(s)
- Morgan V Farrell
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Mina Y Airkin
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Tatyana N Ali
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Zainalabdin S Altoblani
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Chynna R Bowman
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Abigail Anne B Diaz
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Paul F Faurot
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Joshua E Frausto
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Sazan F Haji
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Basma A Hamad
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - James B Lively
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Daniella Corene C Luistro
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Yvette Macias
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Steffy Mathew
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Kayla M McKinley
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Somayeh Nasirimoseloo
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Bradley P Tran
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Amanda N Trinh
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
| | - Nicholas J Shikuma
- Department of Biology, Viral Information Institute, San Diego State University, San Diego, California, USA
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Tang D, Tang X, Fang W. New Downstream Signaling Branches of the Mitogen-Activated Protein Kinase Cascades Identified in the Insect Pathogenic and Plant Symbiotic Fungus Metarhizium robertsii. FRONTIERS IN FUNGAL BIOLOGY 2022; 3:911366. [PMID: 37746179 PMCID: PMC10512405 DOI: 10.3389/ffunb.2022.911366] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Accepted: 04/19/2022] [Indexed: 09/26/2023]
Abstract
Fungi rely on major signaling pathways such as the MAPK (Mitogen-Activated Protein Kinase) signaling pathways to regulate their responses to fluctuating environmental conditions, which is vital for fungi to persist in the environment. The cosmopolitan Metarhizium fungi have multiple lifestyles and remarkable stress tolerance. Some species, especially M. robertsii, are emerging models for investigating the mechanisms underlying ecological adaptation in fungi. Here we review recently identified new downstream branches of the MAPK cascades in M. robertsii, which controls asexual production (conidiation), insect infection and selection of carbon and nitrogen nutrients. The Myb transcription factor RNS1 appears to be a central regulator that channels information from the Fus3- and Slt2-MAPK cascade to activate insect infection and conidiation, respectively. Another hub regulator is the transcription factor AFTF1 that transduces signals from the Fus3-MAPK and the membrane protein Mr-OPY2 for optimal formation of the infection structures on the host cuticle. Homologs of these newly identified regulators are found in other Metarhizium species and many non-Metarhizium fungi, indicating that these new downstream signaling branches of the MAPK cascades could be widespread.
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Affiliation(s)
| | | | - Weiguo Fang
- MOE Key Laboratory of Biosystems Homeostasis & Protection, College of Life Science, Institute of Microbiology, Zhejiang University, Hangzhou, China
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Slt2-MAPK/RNS1 Controls Conidiation via Direct Regulation of the Central Regulatory Pathway in the Fungus Metarhizium robertsii. J Fungi (Basel) 2021; 8:jof8010026. [PMID: 35049966 PMCID: PMC8779605 DOI: 10.3390/jof8010026] [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: 12/09/2021] [Revised: 12/25/2021] [Accepted: 12/27/2021] [Indexed: 01/18/2023] Open
Abstract
Ascomycete fungi usually produce small hydrophobic asexual conidia that are easily dispersed and essential for long-term survival under a variety of environmental conditions. Several upstream signaling regulators have been documented to control conidiation via regulation of the central regulatory pathway that contains the transcription factors BrlA, AbaA and WetA. Here, we showed that the Slt2-MAPK signaling pathway and the transcription factor RNS1 constitute a novel upstream signaling cascade that activates the central regulatory pathway for conidiation in the Ascomycetes fungus M. robertsii. The BrlA gene has two overlapping transcripts BrlAα and BrlAβ; they have the same major ORF, but the 5' UTR of BrlAβ is 835 bp longer than the one of BrlAα. During conidiation, Slt2 phosphorylates the serine residue at the position 306 in RNS1, which self-induces. RNS1 binds to the BM2 motif in the promoter of the BrlA gene and induces the expression of the transcript BlrAα, which in turn activates the expression of the genes AbaA and WetA. In conclusion, the Slt2/RNS1 cascade represents a novel upstream signaling pathway that initiates conidiation via direct activation of the central regulatory pathway. This work provides significant mechanistic insights into the production of asexual conidia in an Ascomycete fungus.
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The Sugar Transporter MST1 Is Involved in Colonization of Rhizosphere and Rhizoplane by Metarhizium robertsii. mSystems 2021; 6:e0127721. [PMID: 34904861 PMCID: PMC8670370 DOI: 10.1128/msystems.01277-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
It is widely recognized that plant-symbiotic fungi are supported by photosynthates; however, little is known about the molecular mechanisms underlying the utilization of plant-derived sugars by rhizospheric fungi. In the insect-pathogenic and plant-symbiotic fungus Metarhizium robertsii, we previously showed that the utilization of oligosaccharides by the transporter MRT (Metarhizium raffinose transporter) is important for rhizosphere competency. In this study, we identified a novel monosaccharide transporter (MST1) that is involved in the colonization of the rhizoplane and acts additively with MRT to colonize the rhizosphere. MST1 is not involved in infection of insects by M. robertsii. MST1 is an H+ symporter and is able to transport a broad spectrum of monosaccharides, including glucose, sorbose, mannose, rhamnose, and fructose. Deletion of the Mst1 gene impaired germination and mycelial growth in medium containing the sugars that it can transport. Homologs of MST1 were widely found in many fungi, including plant symbionts such as Trichoderma spp. and mycorrhizal fungi and plant pathogens such as Fusarium spp. This work significantly advances insights into the development of symbiotic relationships between plants and fungi. IMPORTANCE Over 90% of all vascular plant species develop an intimate symbiosis with fungi, which has an enormous impact on terrestrial ecosystems. It is widely recognized that plant-symbiotic fungi are supported by photosynthates, but little is known about the mechanisms for fungi to utilize plant-derived carbon sources. In the fungus Metarhizium robertsii, we identified a novel monosaccharide transporter (MST1) that is an H+ symporter and can transport a broad spectrum of monosaccharides, including glucose, sorbose, mannose, rhamnose, and fructose. MST1 is involved in the colonization of the rhizoplane and acts additively with the previously characterized oligosaccharide transporter MRT to colonize the rhizosphere. Homologs of MST1 were found in many fungi, including plant symbionts and plant pathogens, suggesting that the utilization of plant-derived sugars by MST1 homologs could also be important for other fungi to develop a symbiotic or parasitic relationship with their respective plant hosts.
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