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Transcript pattern analysis of Arf-family genes in the phytopathogen Fusarium oxysporum f. sp. lycopersici reveals the role of Arl3 in the virulence

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Abstract

Fusarium oxysporum f. sp. lycopersici is an important plant pathogen that has been used to understand the virulence mechanisms that soil inhabiting fungi exhibit during the infection process. In F. oxysporum many of the virulence factors are secreted, and the secretion process requires the formation of vesicles. Arf family members, represented by Arf (ADP- Ribosylation Factor), Arl (Arf-like), and Sar (Secretion-associated and Ras-related) proteins, are involved in the vesicle creation process. In this study we identified the Arf family members in F. oxysporum f. sp. lycopersici, which includes seven putative proteins: Arf1, Arf3, Arl1 through Arl3, Arl8B, and Sar1. Quantification of the mRNA levels of each arf encoding gene revealed that the highest expression corresponds to arf1 in all tested conditions. The phylogenetic analysis revealed that no other Arf1 paralogue, such as Arf2 from yeast, is present in F. oxysporum f. sp. lycopersici. The essential function suggested of Arf1 in F. oxysporum f. sp. lycopersici was corroborated experimentally when, after several attempts, it was impossible to obtain a knockout mutant in arf1. Moreover, arl3 mRNA levels increased significantly when plant tissue was added as a sole carbon source, suggesting that the product of these genes could play pivotal roles during plant infection, the corresponding mutant ∆arl3 was less virulent compared to the wild-type strain. These results describe the role of arl3 as a critical regulator of the virulence in F. oxysporum f. sp. lycopersici and stablish a framework for the arf family members to be studied in deeper details in this phytopathogen.

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Funding

This work was supported by grants from Coordinación de la Investigación Científica, Universidad Michoacana de San Nicolás de Hidalgo (2.6, 2.35) México. MIV-M, JAP-M and VA-C and were supported by postgraduate fellowships from CONACYT, CAA-C was supported by a postdoctoral fellowship from the Mexican PRODEP-SEP (511-6/18-12862). MSL-B was supported by grants 27375-R from the Junta de Andalucia (Spain) and by PID2019-108045RB-100 from the Spanish Ministerio de Economia y Competitividad.

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CA A-C, MI V-M, JA P-M, VA-C, JBG-P, KL M-S, MI R-D and MS L-B participated in data acquisition and data interpretation; KL M-S, MI R-D and MS L-B provided reagents and participated in critical analysis, data interpretation, and revision of the article for intellectual content; V M-C participated in the conception and design of the study, data analysis and interpretation, and drafting of the article.

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Correspondence to Víctor Meza-Carmen.

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Araiza-Cervantes, C.A., Valle-Maldonado, M.I., Patiño-Medina, J.A. et al. Transcript pattern analysis of Arf-family genes in the phytopathogen Fusarium oxysporum f. sp. lycopersici reveals the role of Arl3 in the virulence. Antonie van Leeuwenhoek 114, 1619–1632 (2021). https://doi.org/10.1007/s10482-021-01628-1

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  • DOI: https://doi.org/10.1007/s10482-021-01628-1

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