Journal of Fungi最新文献

The plant microbiome plays important roles in plant growth and resistance, but its assembly and affecting factors have not been fully studied for most of the agricultural plants. In this study, the endophytic mycobiota of the leaves and roots and the rhizosphere soils of five pummelo varieties were profiled based on the amplicon sequencing of the fungal internal transcribed spacer (ITS). The fungal richness and diversity were significantly different among the compartments, but not among the pummelo varieties. The composition and structure of the endophytic mycobiota of the compartments were significantly different across all five pummelo varieties. These suggest that the variety effect is weaker than the compartment effect, but still significant in shaping the pummelo mycobiota. Specifically, the dominant leaf endophytic fungal taxa (e.g., Fusarium and Zasmidium), and the root selection of fungal genera from the rhizosphere soils, were significantly different among the varieties. And also, the variety effect is more significant in shaping the leaf endophytic mycobiota than those of the roots. Finally, the pummelo varieties also showed some consistent alterations on the endophytic mycobiota, such as the root enrichment of Exophiala species. Our study indicates that the endophytic mycobiota of pummelos is significantly and interactively affected by plant variety and compartment effects, and suggests some fungi of interest for further tests.

Sclerotium rolfsii Sacc. is a soil-borne fungus that causes southern blight on many crops in the tropical and subtropical regions. In 2018, southern blight was reported as the most prevalent bean root rot in Uganda. Earlier studies ascertained the morphological and pathogenic diversity of S. rolfsii, but a limited understanding of its genetic diversity exists. Knowledge of S. rolfsii genetic diversity is a critical resource for pathogen surveillance and developing common bean varieties with durable resistance. A total of 188 S. rolfsii strains from infected common bean plants were collected from seven agro-ecological zones of Uganda in 2013, 2020 and 2021, and characterized morphologically and pathogenically. The genetic diversity of the strains was assessed using single-nucleotide polymorphisms (SNPs) obtained from whole-genome sequencing. The growth rate of the strains ranged between 1.1 and 3.6 cm per day, while the number of sclerotia produced ranged from 0 to 543 per strain. The strains had fluffy, fibrous, and compact colony texture. The strains were pathogenic on common bean and caused disease severity indices ranging from 10.1% to 93.3%. Average polymorphic information content across all chromosomes was 0.27. Population structure analysis identified five genetically distinct clusters. The results of analysis of molecular variance revealed that 54% of the variation was between clusters while 46% of variation was within clusters. Pairwise comparison of Wright's fixation indices between genetic clusters ranged from 0.31 to 0.78. The findings of this study revealed moderate genetic diversity among S. rolfsii strains, which should be taken into consideration when selecting strains for germplasm screening.

Trametes polyzona is a white-rot basidiomycete with increasing relevance in environmental biotechnology due to its ligninolytic enzymes, biodegradation capacity, and versatile metabolic responses to diverse substrates. To provide an integrated and updated understanding of its biotechnological potential, we conducted a systematic review following PRISMA guidelines. A total of 46 studies published between 1991 and 2024 were analyzed, covering enzymatic production profiles, degradation of xenobiotics, extraction of bioactive metabolites, and experimental conditions influencing performance. Across the literature, T. polyzona consistently exhibits high ligninolytic activity, including laccase specific activities reported up to 1637 U/mg, together with efficient transformation of dyes, pesticides, and phenolic pollutants, and promising antioxidant and antimicrobial properties. However, substantial methodological heterogeneity was identified, particularly in strain characterization, fermentation parameters, and analytical approaches used to quantify enzymatic and biodegradation outcomes. These inconsistencies limit cross-study comparability and hinder process standardization. This review integrates current evidence; highlights critical gaps, such as limited ecotoxicological assessment of degradation products and scarce multi-omics characterization; and identifies key opportunities for process optimization in submerged/solid-state fermentation, bioreactor scaling, and the valorization of fungal metabolites. Overall, T. polyzona remains an underutilized resource with distinct advantages for applied mycology, environmental remediation, and industrial biotechnology.

Fzf1 is a Saccharomyces cerevisiae transcription factor that contains five zinc finger domains (ZF1-5) and induces the expression of at least five genes in response to various chemical stresses by recognizing the shared promoter consensus sequence CS2. The N-terminal ZF1-3 are required and sufficient for binding to CS2, while ZF4 negatively regulates the activity of Fzf1. However, the effect of ZF5 on the activity of Fzf1 is not well defined. In this study, substitutions of the two zinc-coordinating Cys residues (C248S and C253S) of ZF5, or deletion of the whole ZF5 domain, compromised the chemical stress-induced activation of Fzf1. Since the elevated Fzf1-regulated gene expression caused by fzf1-ZF4 could also be reversed by additional deletion of ZF5 or C248S/C253S substitutions, fzf1-ZF5 mutations are epistatic over fzf1-ZF4 mutations. Furthermore, fzf1-ZF5 mutations are recessive to FZF1, while ZF5 is dispensable for the CS2 binding. Finally, Fzf1-ZF5 is required and sufficient to serve as a transcription activation domain when fused to a Gal4 DNA-binding domain. These observations collectively support a working model in which Fzf1 bound to its target gene promoters remains inactive due to an inhibitory activity of ZF4. Upon chemical stress, ZF4 is no longer able to inhibit the ZF5 transactivation activity, leading to the induction of Fzf1-regulated gene expression and subsequent chemical detoxification.

The herbicidal efficacy and crop safety of Fusarium acuminatum strain HL-29, an endophytic fungus isolated from infected Amaranthus retroflexus in Qinghai Province, were evaluated. In vitro leaf assays demonstrated its pathogenicity against four broadleaf weeds, with efficacy ranked as follows: Elsholtzia densa = Senecio vulgaris = Chenopodium album > Malva verticillata. Pot trials further confirmed that the HL-29 fermentate caused 100% disease incidence in S. vulgaris, C. album, and E. densa. Notably, the strain showed no pathogenicity toward seven major local crops, indicating excellent selectivity. Scanning electron microscopy (SEM) revealed key morphological changes during the infection process on C. album leaves. These results establish F. acuminatum HL-29 as a promising biocontrol candidate against broadleaf weeds in the Qinghai-Tibet Plateau, providing a theoretical foundation for developing alpine-adapted mycoherbicides.

White-nose syndrome (WNS) is an infectious disease of bats caused by the psychrophilic fungus Pseudogymnoascus destructans. Phenazine-1-carboxylic acid (PCA) is a microbial secondary metabolite with broad-spectrum antifungal activity. Previous studies show that PCA suppresses the growth of P. destructans at low concentrations, yet its mechanism remains unclear. Here, we evaluated the in vitro antifungal activity of PCA. We then investigated its potential mechanism using physiological and biochemical assays, as well as integrated transcriptomic and metabolomic analyses. PCA showed effective antifungal activity against P. destructans (EC₅₀ = 32.9 μg/mL). Physiological and biochemical assays indicated that PCA perturbed cell wall organization and increased membrane permeability, leading to leakage of intracellular contents. It also induced oxidative stress, DNA damage, and apoptosis. Multi-omics integration revealed that PCA markedly perturbed cell wall and membrane metabolism, virulence factor expression, and energy metabolism. It provoked oxidative stress while downregulating genes involved in the cell cycle, DNA replication, and repair. Together, these findings delineate the inhibitory effects of PCA on P. destructans in vitro, provide initial mechanistic insights into its antifungal action, and suggest that PCA merits further evaluation as a possible component of environmentally compatible strategies for WNS management.

Itaconic acid (IA) is an important bio-based platform chemical produced via submerged fermentation by the filamentous Ascomycete Aspergillus terreus. In this study, we examined the impact of initial phosphate concentration on IA production from D-glucose and D-xylose in optimized, manganese-limited fermentations. Nine phosphate concentrations ranging from 0.04 to 4 g L^-1 were tested, and representative low (0.04 g L^-1), optimal (0.1 g L^-1), and high (0.8 g L^-1) conditions were analyzed in detail in controlled, 6 L scale bioreactors. Phosphate availability primarily influenced biomass formation and the biomass-to-product ratio rather than directly affecting IA accumulation. Both lower- and higher-than-optimal phosphate concentrations decreased the volumetric and specific IA yields, while the highest productivity was observed at 0.1 g L^-1. Expression of the aoxA gene, encoding the cyanide-resistant alternative oxidase (AOX), and AOX enzymatic activity were inversely correlated with extracellular phosphate concentration, consistent with a role in redox homeostasis under phosphate-limited conditions. In contrast, total respiration rates and pellet-type morphology remained unaffected. These findings indicate that phosphate acts mainly as a secondary modulator of IA fermentation performance through its influence on biomass formation, whereas other metabolic constraints play a more dominant role in controlling IA overflow in A. terreus.

The Poaceae family, commonly known as grasses, is one of the most strategically important plant groups on earth. They are globally distributed, found in virtually every terrestrial habitat on earth, from deserts and grasslands to forests and wetlands. An investigation was conducted on the fungi associated with grasses in Sichuan and Guizhou Provinces, China. Based on morphological characteristics and multi-locus phylogenetic analyses (from Maximum Likelihood (ML) and Bayesian Inference (BI)) of combined LSU, SSU, ITS, and tef1-α sequence data, a new genus, Neokeissleriella, and three novel species-Keissleriella guttata, K. sichuanensis, and Neokeissleriella fusispora-were introduced. Two new host records of Keissleriella caraganae, K. yunnanensis and a new geographical record of K. gloeospora in Sichuan Province, China, are reported. To substantiate the newly established taxa, detailed morphological descriptions and illustrations are provided and supported with molecular phylogenetic analysis. This study broadens the understanding of fungal diversity on Poaceae hosts in Sichuan and Guizhou provinces, China, revealing the high potential for identifying novel taxa.

This study investigated the fungal species associated with symptomatic cultivated Brassica crops in Apulia, Southern Italy, during the 2022-2023 growing seasons. Twenty-two samples from Brassica oleracea var. botrytis, B. oleracea var. italica, and B. rapa var. cymosa showing stunting, wilting, necrotic spots, and lesions were analyzed using morphological and molecular analyses. A total of 259 fungal isolates were obtained, mainly belonging to the genera Alternaria, Plectosphaerella, Fusarium, and Sclerotinia, with Alternaria and Plectosphaerella being the most frequent. Microsatellite PCR (MSP-PCR) profiling revealed considerable genetic diversity within the Alternaria and Plectosphaerella genera, whereas Fusarium and Sclerotinia showed uniform profiles. Multilocus analyses (ITS, tef-1α, rpb2, Alt-a1, and gapdh) identified nine species as Alternaria alternata, A. brassicicola, A. japonica, Fusarium solani species complex, Plectosphaerella cucumerina, P. pauciseptata, P. plurivora, Sclerotinia sclerotiorum, and Stemphylium vesicarium. While Alternaria, Fusarium, and Sclerotinia species are well-known Brassicaceae pathogens, P. pauciseptata, P. plurivora, and S. vesicarium have been detected here for the first time on cultivated Brassica crops worldwide. These findings highlight significant intraspecific diversity among the detected fungi and expand the current knowledge of fungal diversity associated with symptomatic cultivated Brassica plants.

In the context of evolving antifungal resistance and increasing reports of clinical outbreaks of non-albicans Candida spp. invasive infections, the rapid detection of resistant patterns is of the utmost importance. Currently, an azole-resistant Candida parapsilosis clinical outbreak is ongoing at Pisa University Hospital. Resistant isolates bear both Y132F and S862C amino acid substitutions. Based on the data and isolates retrieved during the clinical outbreak, mass spectrometry was used to investigate the differences between fluconazole-resistant and -susceptible clinical strains directly from yeast colonies isolated from agar culture media. A total of 39 isolates, 16 susceptible and 23 resistant, were included. Spectra were processed following a standardized pipeline. Several supervised machine learning classifiers such as Random Forest, Light Gradient Boosting Machine, and Support Vector Machine, with and without principal component analysis were implemented to discriminate resistant from susceptible isolates. Support Vector Machine with principal component analysis showed the highest sensitivity in detecting fluconazole resistance (100%). Despite these promising results, external prospective validation of the algorithm with a higher number of clinical isolates retrieved from multiple clinical centers is required.