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Search Results (4)

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Keywords = Purpureocillium lavendulum

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13 pages, 2990 KiB  
Article
The Growth and Conidiation of Purpureocillium lavendulum Are Co-Regulated by Nitrogen Sources and Histone H3K14 Acetylation
by Ping Tang, Jing-Jing Han, Chen-Chen Zhang, Ping-Ping Tang, Feng-Na Qi, Ke-Qin Zhang and Lian-Ming Liang
J. Fungi 2023, 9(3), 325; https://doi.org/10.3390/jof9030325 - 6 Mar 2023
Cited by 2 | Viewed by 2231
Abstract
Plant-parasitic nematodes cause severe economic losses to agriculture. As important biocontrol agents, nematophagous fungi evolved the ability to obtain nitrogen sources from nematodes. However, the impact of nitrogen sources on the growth and development of these fungi is largely unknown. In this study, [...] Read more.
Plant-parasitic nematodes cause severe economic losses to agriculture. As important biocontrol agents, nematophagous fungi evolved the ability to obtain nitrogen sources from nematodes. However, the impact of nitrogen sources on the growth and development of these fungi is largely unknown. In this study, we aimed to better understand how nitrogen sources could influence vegetative growth and conidiation through epigenetic regulation in the nematophagous fungus, Purpureocillium lavendulum. Through nutrition screening, we found a phenomenon of the fungus, limited colony extension with a large amount of conidia production when cultured on PDA media, can be altered by adding ammonia nitrate. Characterized by site-directed mutagenesis, the histone H3K14 acetylation was found to be involved in the alternation. Furthermore, the acetyltransferase PlGCN5 was responsible for H3K14 acetylation. Knockout of Plgcn5 severely diminished conidiation in P. lavendulum. Chip-seq showed that H3K14ac distributed in conidiation regulating genes, and genes in the MAPK pathway which may be the downstream targets in the regulation. These findings suggest that histone modification and nitrogen sources coordinated lifestyle regulation in P. lavendulum, providing new insight into the mechanism of growth regulation by nutritional signals for the carnivorous fungus. Full article
(This article belongs to the Special Issue New Perspectives on Entomopathogenic and Nematode-Trapping Fungi)
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13 pages, 2003 KiB  
Article
First Record of Beauveria varroae, Cordyceps blackwelliae, and Purpureocillium lavendulum from Greece and Their Pathogenicity against Thaumetopoea pityocampa
by Ioannis Lagogiannis, Spiridon Mantzoukas, Panagiotis A. Eliopoulos and Konstantinos Poulas
Diversity 2023, 15(3), 312; https://doi.org/10.3390/d15030312 - 21 Feb 2023
Cited by 5 | Viewed by 2740
Abstract
Entomopathogenic fungi (EPF) consist of a wide range of fungi that can be used as pest control agents, endophytes, and plant growth promoters. In this study of EPF in suburban soils from Achaia, Greece, we used adult beetles as baits for trapping fungal [...] Read more.
Entomopathogenic fungi (EPF) consist of a wide range of fungi that can be used as pest control agents, endophytes, and plant growth promoters. In this study of EPF in suburban soils from Achaia, Greece, we used adult beetles as baits for trapping fungal isolates. According to the macroscopic and microscopic traits of the collected isolates, three species corresponded to Beauveria varroae Vuill. (Hypocreales: Cordycipitaceae); Purpureocillium lavendulum Perdomo, Gené, Cano & Guarro (Hypocreales: Ophiocordycipitaceae); and Cordyceps blackwelliae Mongkolsamrit, Noisripoom, Thanakitpipattana, Spatafora & Luangsaard (Hypocreales: Claviceptaceae). Their taxonomic identity was established by ITS-rDNA sequence amplification and sequencing, molecular database comparisons, and phylogenetic analysis. The application of these new EPF species clearly demonstrated remarkable insecticidal action on Thaumetopoea pityocampa (Lepidoptera, Notodontidae) larvae, which increased with the application dose. Our findings are important based on the enhancement of the application of new EPF species as biocontrol agents within the framework of eco-friendly pest management. Full article
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11 pages, 1199 KiB  
Article
Pathogenicity and Metabolites of Purpureocillium lavendulum YMF1.00683 against Meloidogyne incognita
by Zheng-Xue Bao, Rui Liu, Chun-Qiang Li, Xue-Rong Pan and Pei-Ji Zhao
Pathogens 2022, 11(7), 795; https://doi.org/10.3390/pathogens11070795 - 14 Jul 2022
Cited by 6 | Viewed by 2328
Abstract
Purpureocillium lavendulum is a biological control agent with several registered products that can parasitize the eggs and larvae of various pathogenic nematodes. In this study, the pathogenicity and secondary metabolites of the fungus P. lavendulum YMF1.00683 were investigated. The strain YMF1.00683 had infection [...] Read more.
Purpureocillium lavendulum is a biological control agent with several registered products that can parasitize the eggs and larvae of various pathogenic nematodes. In this study, the pathogenicity and secondary metabolites of the fungus P. lavendulum YMF1.00683 were investigated. The strain YMF1.00683 had infection efficiency against the plant root-knot nematode Meloidogyne incognita. The strain’s process of infecting nematodes was observed under a microscope. Moreover, seven metabolites, including a new sterol (1), were isolated and identified from cultures of YMF1.0068 in Sabouraud’s dextrose agar. A bioassay showed that 5-methoxymethyl-1H-pyrrole-2-carboxaldehyde (7) is toxic to M. incognita and affects the egg hatching. It caused 98.23% mortality in M. incognita and could inhibit 80.78% of the hatching eggs at 400 μg/mL over a period of 96 h. Furthermore, 5-methoxymethyl-1H-pyrrole-2-carboxaldehyde (7) showed a strong avoidance effect at 40 ppm, and its chemotactic index value was −0.37. The results indicate that P. lavendulum could produce active metabolites against M. incognita. Full article
(This article belongs to the Special Issue Microbe-Nematode Interactions)
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17 pages, 3356 KiB  
Article
Identification of Nematicidal Metabolites from Purpureocillium lavendulum
by Rui Liu, Zheng-Xue Bao, Guo-Hong Li, Chun-Qiang Li, Shao-Lin Wang, Xue-Rong Pan, Ke-Qin Zhang and Pei-Ji Zhao
Microorganisms 2022, 10(7), 1343; https://doi.org/10.3390/microorganisms10071343 - 2 Jul 2022
Cited by 12 | Viewed by 2842
Abstract
Purpureocillium lavendulum is a fungus with promising biocontrol applications. Here, transcriptome data acquired during the infection of Caenorhabditis elegans by Purpureocillium lavendulum showed that the transcription of metabolite synthesis genes was significantly up-regulated after 24 and 48 h of the fungus-nematode interaction. Then, [...] Read more.
Purpureocillium lavendulum is a fungus with promising biocontrol applications. Here, transcriptome data acquired during the infection of Caenorhabditis elegans by Purpureocillium lavendulum showed that the transcription of metabolite synthesis genes was significantly up-regulated after 24 and 48 h of the fungus-nematode interaction. Then, the up-regulated transcription level of lipoxygenase was confirmed by RT-qPCR. The ultra-performance liquid chromatography-mass spectrometry (UPLC-MS) analysis of differential metabolites revealed that this interaction resulted in the emergence of new metabolites or enhanced the production of metabolites. The results of the UPLC-MS analysis and the nematicidal assay were used to establish optimal culturing conditions under which 12 metabolites, including 3 hydroxylated C18 fatty acids and 9 steroids, were isolated and identified. Among them, hydroxylated fatty acids showed pronounced nematicidal activity against Meloidogyne incognita, and two degradative sterols showed chemotaxis activity to M. incognita. This study lays a foundation for the function of lipoxygenase and its products during the infection of Purpureocillium lavendulum. Full article
(This article belongs to the Special Issue Secondary Metabolism of Microorganisms)
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