PdMfs1, a major facilitator superfamily transporter from Penicillium digitatum, is partially involved in the imazalil-resistance and pathogenicity

Abstract

Penicillium digitatum, causing green mold, is the most important postharvest pathogen of citrus fruits worldwide. Fungicide imazalil has been used in control of this mold for more than three decades. In the presence of imazalil pressure, imazalil resistance strain has risen worldwide. To explore the potential role of multidrug resistance (MDR) in imazalil resistance, a membrane efflux transporter Penicillium digitatum major facilitator surperfamily1 (PdMfs1) was cloned, and its functions in imazalil resistance and pathogenicity were analyzed. PdMfs1 has an open reading frame (ORF) of 1,876 bp and 3 introns of 55, 49 and 71 bp, respectively. It encodes a protein of 566 amino acids that shares a high degree of similarity with members of the drug: H + antiporter efflux family of the major facilitator surperfamily (MFS) transporters of other fungi. Expression of PdMfs1 was up-regulated by treatment with imazalil and other fungicdes in both imazalil-sensitive and-resistant P. digitatum. Disruption of PdMfs1 gene rendered P. digitatum more sensitive to imazalil and other DMI fungicides, and the imazalil-resistance could be rescued by reintroducing the wild-type PdMfs1 gene into the PdMfs1 disruption mutant (PdMfs1). Overexpression of PdMfs1 rendered P. digitatum more resistant to imazalil. These results indicate that PdMfs1 is a multidrug transporter of P. digitatum that could pump imazalil out of cells, thus contributing resistance to imazalil partially. Pathogenicity analysis showed that the disease on the citrus fruits inoculated with the PdMfs1 developed much slower than that induced by the parental strain PdW03, suggesting that PdMfs1 also plays a role on the virulence of P. digitatum.

Penicillium italicum: An Underexplored Postharvest Pathogen

“…Ergosterol biosynthesis related enzymes have been described as important factors to cycloheximide resistance in Saccharomyces cerevisiae (Abe and Hiraki, 2009). Similarly, the ABC transporter family and the MFS proteins were already reported as up-regulated in P. digitatum fungal resistance (Nakaune et al, 2002;Sánchez-torres and Tuset, 2011;Wang et al, 2012;Wu et al, 2016b). The similarities between transcriptomic analysis of resistant P. italicum and P. digitatum strains indicate common resistance factors in both citrus pathogens.…”

Genome-Wide Analysis of Major Facilitator Superfamily and Its Expression in Response of Poplar to Fusarium oxysporum

“…PtrMFS genes were mapped to the genome of P. trichocarpa , and the chromosomal distribution of PtrMFSs in poplar was visualized with TBtools. TBtools and MCScanX ( Wang et al, 2012 ) were used to analyze tandem duplication events in the PtrMFS gene family, and Dual Synteny Plotter ( Tang et al, 2008 ) was used to analyze segmental duplication events and collinearity between PtrMFSs and homologous gene pairs from other species ( A. thaliana , Eucalyptus grandis , Oryza sativa , and Solanum lycopersicum ). TBtools was used to visualize the results.…”

Target and non‐target site mechanisms of fungicide resistance and their implications for the management of crop pathogens

“…In turn, Penicillium digitatum from citrus has presented complete or partial resistance to triflumizole, imazalil, and prochloraz with overexpression of PMR1, PdMFS1, and PdMFS2 64–66 . For field isolates of S .…”