Journal of Microbiology

Review

Role of Rab GTPases in Bacteria Escaping from Vesicle Trafficking of Host Cells: Huiling Xu, Shengnan Wang, Xiaozhou Wang, Pu Zhang, Qi Zheng, ChangXi Qi, Xiaoting Liu, Muzi Li, Yongxia Liu, Jianzhu Liu; J. Microbiol. 2024;62(8):581-590. Published online August 30, 2024; DOI: https://doi.org/10.1007/s12275-024-00162-9

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Abstract: Most bacteria will use their toxins to interact with the host cell, causing damage to the cell and then escaping from it. When bacteria enter the cell, they will be transported via the endosomal pathway. Rab GTPases are involved in bacterial transport as major components of endosomes that bind to their downstream effector proteins. The bacteria manipulate some Rab GTPases, escape the cell, and get to survive. In this review, we will focus on summarizing the many processes of how bacteria manipulate Rab GTPases to control their escape.

Journal Articles

Effects of Phosphorus‑dissolving Dark Septate Endophytes on the Growth of Blueberry: Qixin Luo , Rui Hou , Xiaojing Shang , Si Li; J. Microbiol. 2023;61(9):837-851. Published online October 5, 2023; DOI: https://doi.org/10.1007/s12275-023-00080-2

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Dark septate endophytes (DSEs) are widely distributed and improve plant growth. DSEs secrete large amounts of enzymes to mineralize insoluble phosphorus in soil and convert it into soluble phosphorus, promoting plant uptake of phosphorus. However, the effects of DSEs with phosphate-solubilizing ability on host plants need further study. In this study, phosphorusdissolving DSEs were screened for growth-promoting effects. We isolated, identified and characterized three DSE species (Thozetella neonivea, Pezicula ericae and Hyaloscyphaceae sp.) showing phosphate-solubilizing ability. The impact of single, dual or triple inoculation of DSEs on blueberry plant characteristics was studied. Their effects on colonization intensity, seedling biomass, nutrients in plants and soil, and activities of plant resistance enzymes and soil enzymes were markedly upregulated relative to the control (P < 0.05). The available phosphorus and acid phosphatase levels in different combinations were significantly increased. These findings indicate that the application of the three DSEs may be valuable in facilitating the cultivation of blueberry with a higher biomass and improved plant quality.

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Diversity and Functional Roles of Root-Associated Endophytic Fungi in Two Dominant Pioneer Trees Reclaimed from a Metal Mine Slag Heap in Southwest China
Bo Bi, Yuqing Xiao, Xiaonan Xu, Qianqian Chen, Haiyan Li, Zhiwei Zhao, Tao Li
Microorganisms.2024; 12(10): 2067. CrossRef
Short-term organic fertilizer substitution increases sorghum yield by improving soil physicochemical characteristics and regulating microbial community structure
Mengen Nie, Guangqian Yue, Lei Wang, Yizhong Zhang
Frontiers in Plant Science.2024;[Epub] CrossRef

Rasiella rasia gen. nov. sp. nov. within the family Flavobacteriaceae isolated from seawater recirculating aquaculture system: Seong-Jin Kim , Young-Sam Kim , Sang-Eon Kim , Hyun-Kyoung Jung , Jeeeun Park , Min-Ju Yu , Kyoung-Ho Kim; J. Microbiol. 2022;60(11):1070-1076. Published online October 17, 2022; DOI: https://doi.org/10.1007/s12275-022-2099-7

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Abstract

A novel bacterium designated RR4-40T was isolated from a biofilter of seawater recirculating aquaculture system in Busan, South Korea. Cells are strictly aerobic, Gram-negative, irregular short rod, non-motile, and oxidase- and catalase-negative. Growth was observed at 15–30°C, 0.5–6% NaCl (w/v), and pH 5.0–9.5. The strain grew optimally at 28°C, 3% salinity (w/v), and pH 8.5. The phylogenetic analysis based on 16S rRNA gene sequences showed that strain RR4-40T was most closely related to Marinirhabdus gelatinilytica NH83T (94.16% of 16S rRNA gene similarity) and formed a cluster with genera within the family Flavobacteriaceae. The values of the average nucleotide identity (ANI), digital DNA-DNA hybridization (dDDH), and average amino acid identity (AAI) between genomes of strain RR4-40T and M. gelatinilytica NH83T were 72.91, 18.2, and 76.84%, respectively, and the values against the strains in the other genera were lower than those. The major fatty acids were iso-C15:0 (31.34%), iso-C17:0 3-OH (13.65%), iso-C16:0 3-OH (10.61%), and iso-C15:1 G (10.38%). The polar lipids comprised phosphatidylglycerol, diphosphatidylglycerol, aminophospholipid, aminolipid, glycolipid, and sphingolipid. The major respiratory quinone was menaquinone-6 (MK-6) and the DNA G + C content of strain RR4-40T was 37.4 mol%. According to the polyphasic analysis, strain RR4-40T is considered to represent a novel genus within the family Flavobacteriaceae, for which the name Rasiella rasia gen. nov, sp. nov. is proposed. The type strain is RR4-40T (= KCTC 52650T = MCCC 1K04210T).

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Rhodobacteraceae are Prevalent and Ecologically Crucial Bacterial Members in Marine Biofloc Aquaculture
Meora Rajeev, Jang-Cheon Cho
Journal of Microbiology.2024; 62(11): 985. CrossRef
Validation List no. 215. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2024;[Epub] CrossRef

Functional characterization of HigBA toxin-antitoxin system in an Arctic bacterium, Bosea sp. PAMC 26642: Eunsil Choi , Ahhyun Huh , Changmin Oh , Jeong-Il Oh , Ho Young Kang , Jihwan Hwang; J. Microbiol. 2022;60(2):192-206. Published online February 1, 2022; DOI: https://doi.org/10.1007/s12275-022-1619-9

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Abstract

Toxin-antitoxin (TA) systems are growth-controlling genetic elements consisting of an intracellular toxin protein and its cognate antitoxin. TA systems have been spread among microbial genomes through horizontal gene transfer and are now prevalent in most bacterial and archaeal genomes. Under normal growth conditions, antitoxins tightly counteract the activity of the toxins. Upon stresses, antitoxins are inactivated, releasing activated toxins, which induce growth arrest or cell death. In this study, among nine functional TA modules in Bosea sp. PAMC 26642 living in Arctic lichen, we investigated the functionality of BoHigBA2. BohigBA2 is located close to a genomic island and adjacent to flagellar gene clusters. The expression of BohigB2 induced the inhibition of E. coli growth at 37°C, which was more manifest at 18°C, and this growth defect was reversed when BohigA2 was co-expressed, suggesting that this BoHigBA2 module might be an active TA module in Bosea sp. PAMC 26642. Live/dead staining and viable count analyses revealed that the BoHigB2 toxin had a bactericidal effect, causing cell death. Furthermore, we demonstrated that BoHigB2 possessed mRNA-specific ribonuclease activity on various mRNAs and cleaved only mRNAs being translated, which might impede overall translation and consequently lead to cell death. Our study provides the insight to understand the cold adaptation of Bosea sp. PAMC 26642 living in the Arctic.

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Evaluating the Contribution of the Predicted Toxin–Antitoxin System HigBA to Persistence, Biofilm Formation, and Virulence in Burkholderia pseudomallei
Itziar Chapartegui-González, Nittaya Khakhum, Jacob L. Stockton, Alfredo G. Torres, Igor E. Brodsky
Infection and Immunity.2022;[Epub] CrossRef
Chronicle of Research into Lichen-Associated Bacteria
Zichen He, Takeshi Naganuma
Microorganisms.2022; 10(11): 2111. CrossRef
Degradation of amoxicillin by newly isolated Bosea sp. Ads-6
Lei Yan, Ning Yan, Xi-Yan Gao, Ying Liu, Zhi-Pei Liu
Science of The Total Environment.2022; 828: 154411. CrossRef

Whole genome and RNA sequencing of oral commensal bacterium Streptococcus anginosus subsp. anginosus with vancomycin tolerance: Kyu Hwan Kwack , Jae-Hyung Lee , Ji-Hoi Moon; J. Microbiol. 2022;60(2):167-176. Published online January 7, 2022; DOI: https://doi.org/10.1007/s12275-022-1425-4

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Abstract

“Antibiotic tolerance” promotes the rapid subsequent evolution of “antibiotic resistance,” however, it is often overlooked because it is difficult to distinguish between tolerant and susceptible organisms. A commensal bacterium S. anginosus subsp. anginosus strain KHUD_S1, isolated from dental biofilm was found to exhibit a high MBC/MIC ratio of 32 against vancomycin. We observed KHUD_S1 cells exposed to vancomycin did not grow but maintained viability. Transmission electron microscope showed KHUD_S1 cells possessed a dense, thick capsule and maintained the cell wall integrity upon vancomycin exposure. To infer the underlying mechanisms of the vancomycin tolerance in KHUD_S1, we performed whole genome sequencing and RNA sequencing. The KHUD_S1 genome carried three genes encoding branching enzymes that can affect peptidoglycan structure through interpeptide bridge formation. Global gene expression profiling revealed that the vancomycin-induced downregulation of carbohydrate and inorganic ion transport/metabolism as well as translation is less prominent in KHUD_S1 than in the vancomycin susceptible strain KHUD_S3. Based on the transcriptional levels of genes related to peptidoglycan synthesis, KHUD_S1 was determined to have a 3D peptidoglycan architecture distinct from KHUD_S3. It was found that, under vancomycin exposure, the peptidoglycan was remodeled through changes in the interpeptide bridge and transpeptidation reactions. Collectively, these features of S. anginosus KHUD_S1, including a dense capsule and differential gene expression in peptidoglycan synthesis, may contribute to vancomycin tolerance. Our results showing the occurrence of vancomycin tolerance amongst oral commensal bacteria highlight the need for considering future strategies for screening of antibiotic tolerance as an effort to reduce antibiotic resistance.

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Gut resistome profiling reveals high diversity and fluctuations in pancreatic cancer cohorts
Xudong Liu, Kexin Li, Yun Yang, Dingyan Cao, Xinjie Xu, Zilong He, Wenming Wu
Frontiers in Cellular and Infection Microbiology.2024;[Epub] CrossRef
The Sexome ‐ A proof of concept study into microbial transfer between heterosexual couples after sexual intercourse
Ruby Dixon, Siobhon Egan, Sheree Hughes, Brendan Chapman
Forensic Science International.2023; 348: 111711. CrossRef

Lactiplantibacillus plantarum LRCC5314 includes a gene for serotonin biosynthesis via the tryptophan metabolic pathway: Jiseon Jeong , Yunjeong Lee , Seokmin Yoon , Jong-Hwa Kim , Wonyong Kim; J. Microbiol. 2021;59(12):1092-1103. Published online December 4, 2021; DOI: https://doi.org/10.1007/s12275-021-1472-2

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Abstract

As the functions of probiotics within the same species may not be shared, it is important to analyze the genetic characteristics of strains to determine their safety and usefulness before industrial applications. Hence the present study was undertaken to determine functional genes, and beneficial activities of strain LRCC5314, a bacterial strain isolated from kimchi through comparative genomic analysis. Phylogenetic analysis based on the 16S rRNA gene sequence showed that strain LRCC5314 was a member of the species L. plantarum. Whole genome size of strain LRCC5314 was sequence was 3.25 Mb long, with a G + C content of 44.5 mol% and 3,031 predicted genes. Strain LRCC5314 could metabolize hexoses through homofermentation, which produces only lactic acid from hexoses. According to gene annotation, strain LRCC- 5314 contained genes of EPS production and CRISPR. Moreover, the strain contained genes that could encode a complete biosynthetic pathway for the production of tryptophan, which can be used as a precursor of serotonin. Notably, the tryptophan and serotonin activities strain LRCC5314 were higher than those of reference strains, L. plantarum ATCC 14917T, DSM 20246, DSM 2601, and ATCC 8014, which reach tryptophan amount of 0.784 ± 0.045 μM/ml in MRS broth and serotonin concentration of 19.075 ± 0.295 ng/ml in HT-22 cells. These findings indicated that L. plantarum LRCC5314 could provide a source for serotonin production and could be used as a functional probiotic for stress regulation.

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Ramya Balasubramanian, Elizabeth Schneider, Eoin Gunnigle, Paul D. Cotter, John F. Cryan
Neuroscience & Biobehavioral Reviews.2024; 158: 105562. CrossRef
Effect of postbiotic Lactiplantibacillus plantarum LRCC5314 supplemented in powdered milk on type 2 diabetes in mice
J.-H. Kim, W. Kwak, Y. Nam, J. Baek, Y. Lee, S. Yoon, W. Kim
Journal of Dairy Science.2024; 107(8): 5301. CrossRef
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Erik C. Swanson, Christopher M. Basting, Nichole R. Klatt
Microbiome.2024;[Epub] CrossRef
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Justina Mileriene, Jurgita Aksomaitiene, Kristina Kondrotiene, Tora Asledottir, Gerd Elisabeth Vegarud, Loreta Serniene, Mindaugas Malakauskas
Microorganisms.2023; 11(4): 1034. CrossRef
Probiotic Incorporation into Yogurt and Various Novel Yogurt-Based Products
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Applied Sciences.2022; 12(24): 12607. CrossRef

Review

Potential of Bacillus velezensis as a probiotic in animal feed: a review: Fatima Khalid , Anam Khalid , Yuechi Fu , Qian Hu , Yunfang Zheng , Salman Khan , Zaigui Wang; J. Microbiol. 2021;59(7):627-633. Published online July 1, 2021; DOI: https://doi.org/10.1007/s12275-021-1161-1

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Abstract

Bacillus velezensis is a plant growth-promoting bacterium that can also inhibit plant pathogens. However, based on its properties, it is emerging as a probiotic in animal feed. This review focuses on the potential characteristics of B. velezensis for use as a probiotic in the animal feed industry. The review was conducted by collecting recently published articles from peer-reviewed journals. Google Scholar and PubMed were used as search engines to access published literature. Based on the information obtained, the data were divided into three groups to discuss the (i) probiotic characteristics of B. velezensis, (ii) probiotic potential for fish, and (iii) the future potential of this species to be developed as a probiotic for the animal feed industry. Different strains of B. velezensis isolated from different sources were found to have the ability to produce antimicrobial compounds and have a beneficial effect on the gut microbiota, with the potential to be a candidate probiotic in the animal feed industry. This review provides valuable information about the characteristics of B. velezensis, which can provide researchers with a better understanding of the use of this species in the animal feed industry.

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Journal Articles

Patterns and drivers of Vibrio isolates phylogenetic diversity in the Beibu Gulf, China: Xing Chen , Hong Du , Si Chen , Xiaoli Li , Huaxian Zhao , Qiangsheng Xu , Jinli Tang , Gonglingxia Jiang , Shuqi Zou , Ke Dong , Jonathan M. Adams , Nan Li , Chengjian Jiang; J. Microbiol. 2020;58(12):998-1009. Published online October 23, 2020; DOI: https://doi.org/10.1007/s12275-020-0293-z

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Abstract

Members of the genus Vibrio are ubiquitous in aquatic environments and can be found either in a culturable or a viable but nonculturable (VBNC) state. Despite widespread concerns as to how to define the occurrence and dynamics of Vibrio populations by culture-independent approaches, further physiological research and relevant biotechnological developments will require the isolation and cultivation of the microbes from various environments. The present work provides data and perspectives on our understanding of culturable Vibrio community structure and diversity in the Beibu Gulf. Finally, we isolated 1,037 strains of Vibrio from 45 samples and identified 18 different species. Vibrio alginolyticus, V. cyclitrophicus, V. tasmaniensis, V. brasiliensis, and V. splendidus were the dominant species that had regional distribution characteristics. The correlation between the quantitative distribution and community structure of culturable Vibrio and environmental factors varied with the Vibrio species and geographical locations. Among them, salinity, nitrogen, and phosphorus were the main factors affecting the diversity of culturable Vibrio. These results help to fill a knowledge gap on Vibrio diversity and provide data for predicting and controlling pathogenic Vibrio outbreaks in the Beibu Gulf.

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Environmental factors that regulate Vibrio spp. abundance and community structure in tropical waters
Yi You Wong, Choon Weng Lee, Chui Wei Bong, Joon Hai Lim, Ching Ching Ng, Kumaran Narayanan, Edmund Ui Hang Sim, Ai-jun Wang
Anthropocene Coasts.2024;[Epub] CrossRef
Co-occurrence of chromophytic phytoplankton and the Vibrio community during Phaeocystis globosa blooms in the Beibu Gulf
Qiangsheng Xu, Pengbin Wang, Jinghua Huangleng, Huiqi Su, Panyan Chen, Xing Chen, Huaxian Zhao, Zhenjun Kang, Jinli Tang, Gonglingxia Jiang, Zhuoting Li, Shuqi Zou, Ke Dong, Yuqing Huang, Nan Li
Science of The Total Environment.2022; 805: 150303. CrossRef
Virulence mechanisms of vibrios belonging to the Splendidus clade as aquaculture pathogens, from case studies and genome data
Weiwei Zhang, Chenghua Li
Reviews in Aquaculture.2021; 13(4): 2004. CrossRef

Phenotypic characterization of a conserved inner membrane protein YhcB in Escherichia coli: Chul Gi Sung , Umji Choi , Chang-Ro Lee; J. Microbiol. 2020;58(7):598-605. Published online April 22, 2020; DOI: https://doi.org/10.1007/s12275-020-0078-4

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Abstract

Although bacteria have diverse membrane proteins, the function of many of them remains unknown or uncertain even in Escherichia coli. In this study, to investigate the function of hypothetical membrane proteins, genome-wide analysis of phenotypes of hypothetical membrane proteins was performed under various envelope stresses. Several genes responsible for adaptation to envelope stresses were identified. Among them, deletion of YhcB, a conserved inner membrane protein of unknown function, caused high sensitivities to various envelope stresses and increased membrane permeability, and caused growth defect under normal growth conditions. Furthermore, yhcB deletion resulted in morphological aberration, such as branched shape, and cell division defects, such as filamentous growth and the generation of chromosome- less cells. The analysis of antibiotic susceptibility showed that the yhcB mutant was highly susceptible to various anti-folate antibiotics. Notably, all phenotypes of the yhcB mutant were completely or significantly restored by YhcB without the transmembrane domain, indicating that the localization of YhcB on the inner membrane is dispensable for its function. Taken together, our results demonstrate that YhcB is involved in cell morphology and cell division in a membrane localization-independent manner.

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Co-ordinated assembly of the multilayered cell envelope of Gram-negative bacteria
Elayne M Fivenson, Laurent Dubois, Thomas G Bernhardt
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Loss of YhcB results in overactive fatty acid biosynthesis
Hannah M. Stanley, M. Stephen Trent, K. Heran Darwin
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Loss of YhcB results in dysregulation of coordinated peptidoglycan, LPS and phospholipid synthesis during Escherichia coli cell growth
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Review

MINIREVIEW] EAST1 toxin: An enigmatic molecule associated with sporadic episodes of diarrhea in humans and animals: J. Daniel Dubreuil; J. Microbiol. 2019;57(7):541-549. Published online June 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8651-4

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Abstract

EAST1 is produced by a subset of enteroaggregative Escherichia coli strains. This toxin is a 38-amino acid peptide of 4100 Da. It shares 50% homology with the enterotoxic domain of STa and interacts with the same receptor. The mechanism of action of EAST1is proposed to be identical to that of STa eliciting a cGMP increase. EAST1 is associated with diarrheal disease in Man and various animal species including cattle and swine. Nevertheless, as EAST1-positive strains as well as culture supernatants did not provoke unequivocally diarrhea either in animal models or in human volunteers, the role of this toxin in disease is today still debated. This review intent is to examine the role of EAST1 toxin in diarrheal illnesses.

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Cyanobacterial biodiversity of semiarid public drinking water supply reservoirs assessed via next-generation DNA sequencing technology: Adriana Sturion Lorenzi , Mathias Ahii Chia , Fabyano Alvares Cardoso Lopes , Genivaldo Gueiros Z. Silva , Robert A. Edwards , Maria do Carmo Bittencourt-Oliveira; J. Microbiol. 2019;57(6):450-460. Published online May 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8349-7

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Abstract

Next-generation DNA sequencing technology was applied to generate molecular data from semiarid reservoirs during well-defined seasons. Target sequences of 16S-23S rRNA ITS and cpcBA-IGS were used to reveal the taxonomic groups of cyanobacteria present in the samples, and genes coding for cyanotoxins such as microcystins (mcyE), saxitoxins (sxtA), and cylindrospermopsins (cyrJ) were investigated. The presence of saxitoxins in the environmental samples was evaluated using ELISA kit. Taxonomic analyses of high-throughput DNA sequencing data showed the dominance of the genus Microcystis in Mundaú reservoir. Furthermore, it was the most abundant genus in the dry season in Ingazeira reservoir. In the rainy season, 16S-23S rRNA ITS analysis revealed that Cylindrospermopsis raciborskii comprised 46.8% of the cyanobacterial community in Ingazeira reservoir, while the cpcBAIGS region revealed that C. raciborskii (31.8%) was the most abundant taxon followed by Sphaerospermopsis aphanizomenoides (17.3%) and Planktothrix zahidii (16.6%). Despite the presence of other potential toxin-producing genera, the detected sxtA gene belonged to C. raciborskii, while the mcyE gene belonged to Microcystis in both reservoirs. The detected mcyE gene had good correlation with MC content, while the amplification of the sxtA gene was related to the presence of STX. The cyrJ gene was not detected in these samples. Using DNA analyses, our results showed that the cyanobacterial composition of Mundaú reservoir was similar in successive dry seasons, and it varied between seasons in Ingazeira reservoir. In addition, our data suggest that some biases of analysis influenced the cyanobacterial communities seen in the NGS output of Ingazeira reservoir.

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Biocontrol activity of volatile organic compounds from Streptomyces alboflavus TD-1 against Aspergillus flavus growth and aflatoxin production: Mingguan Yang , Laifeng Lu , Jing Pang , Yiling Hu , Qingbin Guo , Zhenjing Li , Shufen Wu , Huanhuan Liu , Changlu Wang; J. Microbiol. 2019;57(5):396-404. Published online May 6, 2019; DOI: https://doi.org/10.1007/s12275-019-8517-9

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Abstract

Aspergillus flavus is a saprophytic fungus that contaminates crops with carcinogenic aflatoxin. In the present work, the antifungal effects of volatile organic compounds (VOCs) from Streptomyces alboflavus TD-1 against A. flavus were investigated. VOCs from 8-day-old wheat bran culture of S. alboflavus TD-1 displayed strong inhibitory effects against mycelial growth, sporulation, and conidial germination of A. flavus. Severely misshapen conidia and hyphae of A. flavus were observed by scanning electron microscopy after exposure to VOCs for 6 and 12 h, respectively. Rhodamine 123 staining of mitochondria indicated that mitochondria may be a legitimate antifungal target of the VOCs from S. alboflavus TD-1. Furthermore, the VOCs effectively inhibited aflatoxin B1 production by downregulating genes involved in aflatoxin biosynthesis. Dimethyl trisulfide and benzenamine may play important roles in the suppression of A. flavus growth and production of aflatoxin. The results indicate that VOCs from S. alboflavus TD-1 have tremendous potential to be developed as a useful bio-pesticide for controlling A. flavus.

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Characterization of the velvet regulators in Aspergillus flavus: Tae-Jin Eom , Heungyun Moon , Jae-Hyuk Yu , Hee-Soo Park; J. Microbiol. 2018;56(12):893-901. Published online October 25, 2018; DOI: https://doi.org/10.1007/s12275-018-8417-4

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Abstract

Fungal development and secondary metabolism are closely associated via the activities of the fungal NK-kB-type velvet regulators that are highly conserved in filamentous fungi. Here, we investigated the roles of the velvet genes in the aflatoxigenic fungus Aspergillus flavus. Distinct from other Aspergillus species, the A. flavus genome contains five velvet genes, veA, velB, velC, velD, and vosA. The deletion of velD blocks the production of aflatoxin B1, but does not affect the formation of sclerotia. Expression analyses revealed that vosA and velB mRNAs accumulated at high levels during the late phase of asexual development and in conidia. The absence of vosA or velB decreased the content of conidial trehalose and the tolerance of conidia to the thermal and UV stresses. In addition, double mutant analyses demonstrated that VosA and VelB play an inter-dependent role in trehalose biosynthesis and conidial stress tolerance. Together with the findings of previous studies, the results of the present study suggest that the velvet regulators play the conserved and vital role in sporogenesis, conidial trehalose biogenesis, stress tolerance, and aflatoxin biosynthesis in A. flavus.

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Variation of cassiicolin genes among Chinese isolates of Corynespora cassiicola: Jun Wu , Xuewen Xie , Yanxia Shi , Ali Chai , Qi Wang , Baoju Li; J. Microbiol. 2018;56(9):634-647. Published online July 27, 2018; DOI: https://doi.org/10.1007/s12275-018-7497-5

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Abstract

Corynespora cassiicola is a species of fungus that is a plant pathogen of many agricultural crop plants, including severe target spot disease on cucumber. Cassiicolin is an important effector of pathogenicity of this fungus. In this study, we collected 141 Corynespora isolates from eighteen hosts, and the casscolin gene was detected in 82 C. cassiicola strains. The deduced protein sequences revealed that 72 isolates contained the Cas2 gene, two strains from Gynura bicolor harboured the Cas2.2 gene, and 59 isolates without a cassiicolin gene were classified as Cas0. Phylogenetic analyses was performed for the 141 isolates using four loci (ITS, ga4, caa5, and act1) and revealed two genetic clusters. Cluster A is composed of four subclades: subcluster A1 includes all Cas2 isolates plus 18 Cas0 strains, subcluster A2 includes the eight Cas5 isolates and one Cas0 isolate, and subclusters A3 and A4 contain Cas0 strains. Cluster B consists of 21 Cas0 isolates. Twenty-two C. cassiicola strains from different toxin classes showed varying degrees of virulence against cucumber. Cas0 or Cas2 strains induced diverse responses on cucumber, from no symptoms to symptoms of moderate or severe infection, but all Cas5 isolates exhibited avirulence on cucumber.

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Diversity of cassiicolin profiles and culture filtrate toxicity of Corynespora cassiicola isolates from South Indian rubber plantations
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Isolation and characterization of Aspergillus flavus strains in China: Firew Tafesse Mamo , Bo Shang , Jonathan Nimal Selvaraj , Yan Wang , Yang Liu; J. Microbiol. 2018;56(2):119-127. Published online February 2, 2018; DOI: https://doi.org/10.1007/s12275-018-7144-1

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Abstract

Important staple foods (peanuts, maize and rice) are susceptible to contamination by aflatoxin (AF)-producing fungi such as Aspergillus flavus. The objective of this study was to explore non-aflatoxin-producing (atoxigenic) A. flavus strains as biocontrol agents for the control of AFs. In the current study, a total of 724 A. flavus strains were isolated from different regions of China. Polyphasic approaches were utilized for species identification. Non-aflatoxin and non-cyclopiazonic acid (CPA)-producing strains were further screened for aflatoxin B1 (AFB1) biosynthesis pathway gene clusters using a PCR assay. Strains lacking an amplicon for the regulatory gene aflR were then analyzed for the presence of the other 28 biosynthetic genes. Only 229 (32%) of the A. flavus strains were found to be atoxigenic. Smaller (S) sclerotial phenotypes were dominant (51%) compared to large (L, 34%) and non-sclerotial (NS, 15%) phenotypes. Among the atoxigenic strains, 24 strains were PCR-negative for the fas-1 and aflJ genes. Sixteen (67%) atoxigenic A. flavus strains were PCRnegative for 10 or more of the biosynthetic genes. Altogether, 18 new PCR product patterns were observed, indicating great diversity in the AFB1 biosynthesis pathway. The current study demonstrates that many atoxigenic A. flavus strains can be isolated from different regions of China. In the future laboratory as well as field based studies are recommended to test these atoxigenic strains as biocontrol agents for aflatoxin contamination.

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Development of an on-spot and rapid recombinase polymerase amplification assay for Aspergillus flavus detection in grains
Qijun Liu, Xu Li, Riqin Wu, Xinglong Xiao, Fuguo Xing
Food Control.2021; 125: 107957. CrossRef
Bio-competitive exclusion: efficacy of non-aflatoxigenic Aspergillus section Flavi-L morphotypes in control of aflatoxigenic Aspergillus flavus in groundnuts (Arachis hypogaea L.)
Anyway Chofamba
Beni-Suef University Journal of Basic and Applied Sciences.2021;[Epub] CrossRef
Synthesis of chitosan–silver nanoparticles with antifungal properties on bamboo straws
Vo-Van Quoc Bao, Le Dai Vuong, Yves Waché
Nanomaterials and Energy.2021; 10(2): 111. CrossRef
Competency of Clove and Cinnamon Essential Oil Fumigation against Toxigenic and Atoxigenic Aspergillus flavus Isolates
Sansern Rangsuwan, Chainarong Rattanakreetakul, Ratiya Pongpisutta
Journal of Pure and Applied Microbiology.2021; 15(3): 1325. CrossRef
Deciphering the origin ofAspergillus flavusNRRL21882, the active biocontrol agent of Afla‐Guard®
P.‐K. Chang, T.D. Chang, K. Katoh
Letters in Applied Microbiology.2021; 72(5): 509. CrossRef
Evaluation of the Potential of Fungal Biopesticides for the Biological Control of the Seed Bug, Elasmolomus pallens (Dallas) (Hemiptera: Rhyparochromidae)
Fredrick Fidelis Umaru, Khanom Simarani
Insects.2020; 11(5): 277. CrossRef
Occurrence and toxigenic potential ofAspergillussectionFlavion wheat and sorghum silages in Uruguay
Agustina del Palacio, Dinorah Pan
Mycology.2020; 11(2): 147. CrossRef
Genome‐wide nucleotide variation distinguishesAspergillus flavusfromAspergillus oryzaeand helps to reveal origins of atoxigenicA. flavusbiocontrol strains
P.‐K. Chang
Journal of Applied Microbiology.2019; 127(5): 1511. CrossRef

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