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Midorikawa GEO, de Sousa MDLM, Freitas Silva O, Dias JDSA, Kanzaki LIB, Hanada RE, Mesquita RMLC, Gonçalves RC, Alvares VS, Bittencourt DMC, Miller RNG. Characterization of Aspergillus species on Brazil nut from the Brazilian Amazonian region and development of a PCR assay for identification at the genus level. BMC Microbiol 2014; 14:138. [PMID: 24885088 PMCID: PMC4051963 DOI: 10.1186/1471-2180-14-138] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 05/23/2014] [Indexed: 01/29/2023] Open
Abstract
Background Brazil nut is a protein-rich extractivist tree crop in the Amazon region. Fungal contamination of shells and kernel material frequently includes the presence of aflatoxigenic Aspergillus species from the section Flavi. Aflatoxins are polyketide secondary metabolites, which are hepatotoxic carcinogens in mammals. The objectives of this study were to identify Aspergillus species occurring on Brazil nut grown in different states in the Brazilian Amazon region and develop a specific PCR method for collective identification of member species of the genus Aspergillus. Results Polyphasic identification of 137 Aspergillus strains isolated from Brazil nut shell material from cooperatives across the Brazilian Amazon states of Acre, Amapá and Amazonas revealed five species, with Aspergillus section Flavi species A. nomius and A. flavus the most abundant. PCR primers ASP_GEN_MTSSU_F1 and ASP_GEN_MTSSU_R1 were designed for the genus Aspergillus, targeting a portion of the mitochondrial small subunit ribosomal RNA gene. Primer specificity was validated through both electronic PCR against target gene sequences at Genbank and in PCR reactions against DNA from Aspergillus species and other fungal genera common on Brazil nut. Collective differentiation of the observed section Flavi species A. flavus, A. nomius and A. tamarii from other Aspergillus species was possible on the basis of RFLP polymorphism. Conclusions Given the abundance of Aspergillus section Flavi species A. nomius and A. flavus observed on Brazil nut, and associated risk of mycotoxin accumulation, simple identification methods for such mycotoxigenic species are of importance for Hazard Analysis Critical Control Point system implementation. The assay for the genus Aspergillus represents progress towards specific PCR identification and detection of mycotoxigenic species.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Robert N G Miller
- Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Campus Universitário Darcy Ribeiro, CEP 70,910-900 Brasília D,F,, Brazil.
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52
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Introducing the Consolidated Species Concept to resolve species in the Teratosphaeriaceae. Persoonia - Molecular Phylogeny and Evolution of Fungi 2014; 33:1-40. [PMID: 25737591 PMCID: PMC4312929 DOI: 10.3767/003158514x681981] [Citation(s) in RCA: 190] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 03/12/2014] [Indexed: 11/25/2022]
Abstract
The Teratosphaeriaceae represents a recently established family that includes numerous saprobic, extremophilic, human opportunistic, and plant pathogenic fungi. Partial DNA sequence data of the 28S rRNA and RPB2 genes strongly support a separation of the Mycosphaerellaceae from the Teratosphaeriaceae, and also provide support for the Extremaceae and Neodevriesiaceae, two novel families including many extremophilic fungi that occur on a diversity of substrates. In addition, a multi-locus DNA sequence dataset was generated (ITS, LSU, Btub, Act, RPB2, EF-1α and Cal) to distinguish taxa in Mycosphaerella and Teratosphaeria associated with leaf disease of Eucalyptus, leading to the introduction of 23 novel genera, five species and 48 new combinations. Species are distinguished based on a polyphasic approach, combining morphological, ecological and phylogenetic species concepts, named here as the Consolidated Species Concept (CSC). From the DNA sequence data generated, we show that each one of the five coding genes tested, reliably identify most of the species present in this dataset (except species of Pseudocercospora). The ITS gene serves as a primary barcode locus as it is easily generated and has the most extensive dataset available, while either Btub, EF-1α or RPB2 provide a useful secondary barcode locus.
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53
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Alshareef F, Robson GD. Prevalence, persistence, and phenotypic variation of Aspergillus fumigatus in the outdoor environment in Manchester, UK, over a 2-year period. Med Mycol 2014; 52:367-75. [DOI: 10.1093/mmy/myu008] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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54
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Savi GD, Piacentini KC, Tibola CS, Scussel VM. Mycoflora and deoxynivalenol in whole wheat grains (Triticum aestivum L.) from Southern Brazil. FOOD ADDITIVES & CONTAMINANTS PART B-SURVEILLANCE 2014; 7:232-7. [PMID: 25029408 DOI: 10.1080/19393210.2014.898337] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The fungal species Fusarium graminearum is related to deoxynivalenol (DON) formation. The aim of this study was to evaluate mycoflora and DON occurrence in 53 whole wheat grain samples collected in Southern Brazil during the 2012 crop. Wheat grains showed adequate values of water activity ranging from 0.48 to 0.72, within the required limits of moisture content, ranging from 9.1% to 13.9%. In addition, low counts of fungal colonies, ranging from 10 to 8.2 × 10(2), were found. For Fusarium genera, there was predominance of Fusarium verticillioides (34%) and F graminearum (30.2%). For Aspergillus species, 37.7% of Aspergillus flavus was determined. Regarding the Penicillium species, Penicillium digitatum (49%) was the most found species. DON was detected in 47.2% (25 out of 53) of the samples analysed, with levels ranging from 243.7 to 2281.3 µg kg(-1) (mean: 641.9 µg kg(-1)).
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Affiliation(s)
- Geovana D Savi
- a Laboratory of Mycotoxicology and Food Contaminants, Food Science and Technology Department , Center of Agricultural Sciences, Federal University of Santa Catarina , Florianopolis , Brazil
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55
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Maristela M, Ariane MK, Ana CSDS, Ormezinda CCF, Vildes MS. Evaluation of ochratoxin A and fungi in powdered guarana (Paullinia cupana Kunth), a caffeine rich product from Amazon forest. ACTA ACUST UNITED AC 2014. [DOI: 10.5897/ajmr2013.6579] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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56
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Dachoupakan Sirisomboon C, Putthang R, Sirisomboon P. Application of near infrared spectroscopy to detect aflatoxigenic fungal contamination in rice. Food Control 2013. [DOI: 10.1016/j.foodcont.2013.02.034] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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57
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Baquião AC, de Oliveira MMM, Reis TA, Zorzete P, Diniz Atayde D, Correa B. Polyphasic approach to the identification of Aspergillus section Flavi isolated from Brazil nuts. Food Chem 2013; 139:1127-32. [DOI: 10.1016/j.foodchem.2013.01.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 12/28/2012] [Accepted: 01/03/2013] [Indexed: 11/16/2022]
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58
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Dos Santos VM, da Trindade MC, de Souza DWDS, de Menezes AIC, Oguma PM, Nascimento ALO. A 76-year-old man with a right lung adenocarcinoma and invasive Aspergillosis. Mycopathologia 2013; 176:113-8. [PMID: 23615821 DOI: 10.1007/s11046-013-9651-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2012] [Accepted: 04/10/2013] [Indexed: 10/26/2022]
Abstract
A 76-year-old male with adenocarcinoma on the right lung underwent five cycles of chemotherapy with pemetrexed disodium, cisplatin, and dexamethasone. Imaging studies of control showed a node in a cavitary lesion on the left lung, and the main hypothesis was Aspergillus infection. PCR was utilized and contributed to establish the early diagnosis in this patient with invasive aspergillosis. Furthermore, the species Aspergillus fumigatus was characterized by its growing at 50 °C but not at 10 °C, typical culture features, and presence of subclavate vesicles. Diagnosis criteria for Aspergillus pulmonary infection include characteristic clinical and imaging findings, elevated C-reactive protein and erythrocyte sedimentation rate, positive specific serological test, and isolation of Aspergillus from bronchoalveolar cultures. Molecular methods, as PCR, have been useful to complement the conventional microbiological investigations in immunocompromised people with invasive fungal infections. The patient was successfully treated with a schedule of voriconazole 4 mg/kg intravenous infusion every 12 h for 21 days and then switched to oral administration of 200 mg twice a day. He has been comfortable, maintaining normal vital signs, and the results of the periodical microbiologic tests of control are negative. Pathogenesis of invasive aspergillosis in patients with lung cancer is not completely understood. Case studies may contribute to a better knowledge about Aspergillus infection in this setting.
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59
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Culture condition-dependent metabolite profiling of Aspergillus fumigatus with antifungal activity. Fungal Biol 2013; 117:211-9. [PMID: 23537878 DOI: 10.1016/j.funbio.2013.01.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Revised: 01/15/2013] [Accepted: 01/22/2013] [Indexed: 11/22/2022]
Abstract
Three sections of Aspergillus (five species, 21 strains) were classified according to culture medium-dependent and time-dependent secondary metabolite profile-based chemotaxonomy. Secondary metabolites were analysed by liquid chromatography-electrospray ionisation tandem mass spectrometry (LC-ESI-MS-MS) and multivariate statistical methods. From the Aspergillus sections that were cultured on malt extract agar (MEA) and Czapek yeast extract agar (CYA) for 7, 12, and 16 d, Aspergillus sections Fumigati (A. fumigatus), Nigri (A. niger), and Flavi (A. flavus, A. oryzae, and A. sojae) clustered separately on the basis of the results of the secondary metabolite analyses at 16 d regardless of culture medium. Based on orthogonal projection to latent structures discriminant analysis by partial least squares discriminant analysis (PLS-DA), we identified the secondary metabolites that helped differentiate sections between A. fumigatus and Aspergillus section Flavi to be gliotoxin G, fumigatin oxide, fumigatin, pseurotin A or D, fumiquinazoline D, fumagillin, helvolic acid, 1,2-dihydrohelvolic acid, and 5,8-dihydroxy-9,12-octadecadienoic acid (5,8-diHODE). Among these compounds, fumagillin, helvolic acid, and 1,2-dihydrohelvolic acid of A. fumigatus showed antifungal activities against Malassezia furfur, which is lipophilic yeast that causes epidermal skin disorders.
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60
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Lee SK, Kang HG, Na KJ, Han JI. Fungal Dermatitis Caused by Aspergillus sydowii in a Thoroughbred Horse. J Equine Vet Sci 2012. [DOI: 10.1016/j.jevs.2012.03.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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61
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Reis T, Oliveira T, Baquião A, Gonçalves S, Zorzete P, Corrêa B. Mycobiota and mycotoxins in Brazil nut samples from different states of the Brazilian Amazon region. Int J Food Microbiol 2012; 159:61-8. [DOI: 10.1016/j.ijfoodmicro.2012.08.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 07/14/2012] [Accepted: 08/06/2012] [Indexed: 11/30/2022]
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62
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Development and application of a loop-mediated isothermal amplification assay for rapid identification of aflatoxigenic molds and their detection in food samples. Int J Food Microbiol 2012; 159:214-24. [PMID: 23107500 DOI: 10.1016/j.ijfoodmicro.2012.08.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Revised: 08/24/2012] [Accepted: 08/28/2012] [Indexed: 11/21/2022]
Abstract
Aflatoxins are the most thoroughly studied mycotoxins. They are produced by several members of the genus Aspergillus in section Flavi with Aspergillus flavus, Aspergillus parasiticus, and Aspergillus nomius being frequently isolated from contaminated food sources. In this work, we describe the development and evaluation of loop-mediated isothermal amplification (LAMP) assays for rapid detection of the three species in separate analyses. The acl1-gene of A. flavus and amy1-genes of A. nomius and A. parasiticus were used as target genes. The detection limits were 2.4, 7.6 and 20pg of pure DNA/reaction for A. flavus, A. nomius and A. parasiticus, respectively. For specificity testing, DNA extracted from mycelia of representative strains of 39 Aspergillus species, 23 Penicillium species, 75 Fusarium species and 37 other fungal species was used as a template for the specific LAMP primer sets developed for the three target species. The LAMP assay was combined with a DNA extraction method for the analysis of pure fungal cultures as well as artificially contaminated Brazil nuts, peanuts and green coffee beans. It is suggested that the developed LAMP assay is a promising tool in the prediction of a potential aflatoxin risk in food and food raw materials and may therefore be suitable for high throughput analysis in the food industry.
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63
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Shigeyasu C, Yamada M, Nakamura N, Mizuno Y, Sato T, Yaguchi T. Keratomycosis caused byAspergillus viridinutans: anAspergillus fumigatus-resembling mold presenting distinct clinical and antifungal susceptibility patterns. Med Mycol 2012; 50:525-8. [DOI: 10.3109/13693786.2012.658875] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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64
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Mogensen JM, Sørensen SM, Sulyok M, van der Westhuizen L, Shephard GS, Frisvad JC, Thrane U, Krska R, Nielsen KF. Single-kernel analysis of fumonisins and other fungal metabolites in maize from South African subsistence farmers. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2011; 28:1724-34. [PMID: 22023397 DOI: 10.1080/19440049.2011.611823] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Fumonisins are important Fusarium mycotoxins mainly found in maize and derived products. This study analysed maize from five subsistence farmers in the former Transkei region of South Africa. Farmers had sorted kernels into good and mouldy quality. A total of 400 kernels from 10 batches were analysed; of these 100 were visually characterised as uninfected and 300 as infected. Of the 400 kernels, 15% were contaminated with 1.84-1428 mg kg(-1) fumonisins, and 4% (n=15) had a fumonisin content above 100 mg kg(-1). None of the visually uninfected maize had detectable amounts of fumonisins. The total fumonisin concentration was 0.28-1.1 mg kg(-1) for good-quality batches and 0.03-6.2 mg kg(-1) for mouldy-quality batches. The high fumonisin content in the batches was apparently caused by a small number (4%) of highly contaminated kernels, and removal of these reduced the average fumonisin content by 71%. Of the 400 kernels, 80 were screened for 186 microbial metabolites by liquid chromatography-tandem mass spectrometry, detecting 17 other fungal metabolites, including fusaric acid, equisetin, fusaproliferin, beauvericin, cyclosporins, agroclavine, chanoclavine, rugulosin and emodin. Fusaric acid in samples without fumonisins indicated the possibility of using non-toxinogenic Fusaria as biocontrol agents to reduce fumonisin exposure, as done for Aspergillus flavus. This is the first report of mycotoxin profiling in single naturally infected maize kernels.
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Affiliation(s)
- J M Mogensen
- Center for Microbial Biotechnology, Department of Systems Biology, Technical University of Denmark, Søltofts Plads 221, DK-2800 Kgs. Lyngby, Denmark
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65
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Yazdani D, Zainal Abidin MA, Tan YH, Kamaruzaman S. Molecular identification of Aspergillus and Eurotium species isolated from rice and their toxin-producing ability. Microbiology (Reading) 2011. [DOI: 10.1134/s0026261711050195] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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66
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Howard SJ, Harrison E, Bowyer P, Varga J, Denning DW. Cryptic species and azole resistance in the Aspergillus niger complex. Antimicrob Agents Chemother 2011; 55:4802-9. [PMID: 21768508 PMCID: PMC3186969 DOI: 10.1128/aac.00304-11] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2011] [Accepted: 07/11/2011] [Indexed: 11/20/2022] Open
Abstract
Aspergillus niger is a common clinical isolate. Multiple species comprise the Aspergillus section Nigri and are separable using sequence data. The antifungal susceptibility of these cryptic species is not known. We determined the azole MICs of 50 black aspergilli, 45 from clinical specimens, using modified EUCAST (mEUCAST) and Etest methods. Phylogenetic trees were prepared using the internal transcribed spacer, beta-tubulin, and calmodulin sequences to identify strains to species level and the results were compared with those obtained with cyp51A sequences. We attempted to correlate cyp51A mutations with azole resistance. Etest MICs were significantly different from mEUCAST MICs (P < 0.001), with geometric means of 0.77 and 2.79 mg/liter, respectively. Twenty-six of 50 (52%) isolates were itraconazole resistant by mEUCAST (MICs > 8 mg/liter), with limited cross-resistance to other azoles. Using combined beta-tubulin/calmodulin sequences, the 45 clinical isolates grouped into 5 clades, A. awamori (55.6%), A. tubingensis (17.8%), A. niger (13.3%), A. acidus (6.7%), and an unknown group (6.7%), none of which were morphologically distinguishable. Itraconazole resistance was found in 36% of the isolates in the A. awamori group, 90% of the A. tubingensis group, 33% of the A. niger group, 100% of the A. acidus group, and 67% of the unknown group. These data suggest that cyp51A mutations in section Nigri may not play as important a role in azole resistance as in A. fumigatus, although some mutations (G427S, K97T) warrant further study. Numerous cryptic species are found in clinical isolates of the Aspergillus section Nigri and are best reported as "A. niger complex" by clinical laboratories. Itraconazole resistance was common in this data set, but azole cross-resistance was unusual. The mechanism of resistance remains obscure.
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Affiliation(s)
- Susan J Howard
- The University of Manchester, 1.800 Stopford Building, Oxford Road, Manchester M13 9PT, United Kingdom.
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67
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Aflatoxins and ochratoxin A in stored barley grain in Spain and impact of PCR-based strategies to assess the occurrence of aflatoxigenic and ochratoxigenic Aspergillus spp. Int J Food Microbiol 2011; 149:118-26. [DOI: 10.1016/j.ijfoodmicro.2011.06.006] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 05/28/2011] [Accepted: 06/15/2011] [Indexed: 11/17/2022]
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68
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Castellanos-Onorio O, Gonzalez-Rios O, Guyot B, Fontana TA, Guiraud J, Schorr-Galindo S, Durand N, Suárez-Quiroz M. Effect of two different roasting techniques on the Ochratoxin A (OTA) reduction in coffee beans (Coffea arabica). Food Control 2011. [DOI: 10.1016/j.foodcont.2011.01.014] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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69
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70
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Freitas-Silva O, Venâncio A. Brazil nuts: Benefits and risks associated with contamination by fungi and mycotoxins. Food Res Int 2011. [DOI: 10.1016/j.foodres.2011.02.047] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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71
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Santos L, Marin S, Sanchis V, Ramos AJ. In vitro effect of some fungicides on growth and aflatoxins production by Aspergillus flavus isolated from Capsicum powder. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2011; 28:98-106. [PMID: 21120737 DOI: 10.1080/19440049.2010.529622] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The aim of this study was to determine the effect of some pre-harvest fungicides on growth and aflatoxin (AF) production of three Aspergillus flavus strains found in Capsicum powder. Each isolate, previously isolated from paprika, chilli and smoked paprika, was inoculated on yeast extract sucrose agar and on a 3% paprika extract agar medium supplemented with different fungicides and incubated at 20 and 30°C during 7 days. Growth measurements were obtained on days 3, 5 and 7, and the AF production was determined on day 7. The significance of the effects of the factors (strain, medium, temperature, time and fungicides) and their interaction over colony diameter and AF production was determined. Temperature constrained the effectiveness of fungicides in reducing growth, the fungicides being most effective at 20°C. The efficacy of the fungicides over AF production depended on the medium used and temperature. The most effective fungicides in inhibiting growth and AF production, regardless of the strain tested or applied conditions, were tebuconazole 25% and mancozeb 80% applied at a concentration of 0.75 and 3.5 g l(-1), respectively. Care should thus be taken in the choice of a suitable fungicide because their effectiveness may depend on intra-specific variation and temperature. Moreover, it is necessary to take into account that the most efficient fungicide in reducing growth is not always the best choice for pre-harvest treatments because it may promote AF production. Thus, the best fungicide is the one that can simultaneous prevent growth and AF production.
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Affiliation(s)
- L Santos
- Food Technology Department, University of Lleida, XaRTA-UTPV, E-25198 Lleida, Spain
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72
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Gil-Serna J, Vázquez C, Sardiñas N, González-Jaén MT, Patiño B. Revision of ochratoxin a production capacity by the main species of Aspergillus section Circumdati. Aspergillus steynii revealed as the main risk of OTA contamination. Food Control 2011. [DOI: 10.1016/j.foodcont.2010.06.018] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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73
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Santos L, Kasper R, Sardiñas N, Marín S, Sanchis V, Ramos A. Effect of Capsicum carotenoids on growth and aflatoxins production by Aspergillus flavus isolated from paprika and chilli. Food Microbiol 2010; 27:1064-70. [DOI: 10.1016/j.fm.2010.07.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2010] [Revised: 07/05/2010] [Accepted: 07/08/2010] [Indexed: 10/19/2022]
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74
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Choi IY, Choi JN, Sharma PK, Lee WH. Isolation and Identification of Mushroom Pathogens from Agrocybe aegerita. MYCOBIOLOGY 2010; 38:310-315. [PMID: 23956671 PMCID: PMC3741524 DOI: 10.4489/myco.2010.38.4.310] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Accepted: 08/25/2010] [Indexed: 06/02/2023]
Abstract
Agrocybe aegerita is an important mushroom cultivated in Korea, with good feel and a peculiar fragrance. A. aegerita can be cultivated throughout the year using culture bottles but is more susceptible to contamination than other mushrooms. Twenty-two pathogens were isolated from the fruiting bodies and compost of A. aegerita, and seven isolates were isolated from Pleurotus ostreatus to compare with the A. aegerita isolates, collected from Gimje, Iksan, Gunsan of Chonbuk, and Chilgok of Gyeongbuk Province in 2009. These isolates were identified based on morphological and molecular characteristics. Of the 29 isolates, 26 were identified as Trichoderma spp. and the remaining three were Aspergillus spp., Mucor spp., and Penicillium spp. A phylogenetic analysis revealed that the 26 isolates of Trichoderma were divided into four taxa, namely T. harzianum, T. pleuroticola, T. longibrachiatum, and T. atroviride. Among the Trichoderma spp., 16 isolates (55.2%) were identified as T. harzianum, six as T. pleuroticola (20.7%), two as T. longibrachiatum, and the remaining two were T. atroviride.
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Affiliation(s)
- In-Young Choi
- Jeollabuk-do Agricultural Research and Extension Services, Iksan 570-704, Korea
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75
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Cobanoglu F, Aksoy U, Tunalioglu R, Karaman AD. Differences in the economic costs of implementing conventional practices and good practices intended for aflatoxin management in the dried fig supply chain. TOXIN REV 2010. [DOI: 10.3109/15569543.2010.516862] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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76
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Riba A, Bouras N, Mokrane S, Mathieu F, Lebrihi A, Sabaou N. Aspergillus section Flavi and aflatoxins in Algerian wheat and derived products. Food Chem Toxicol 2010; 48:2772-7. [PMID: 20627118 DOI: 10.1016/j.fct.2010.07.005] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2009] [Revised: 06/12/2010] [Accepted: 07/06/2010] [Indexed: 11/17/2022]
Abstract
Wheat and its derivatives are a very important staple food for North African populations. The aim of this study was to analyze populations of Aspergillus section Flavi from local wheat based on aflatoxins (AFs), cyclopiazonic acid (CPA) and sclerotia production, and also to evaluate AFs-contaminated wheat collected from two different climatic regions in Algeria. A total of 108 samples of wheat were collected during the following phases: pre-harvest, storage in silos and after processing. The results revealed that among the Aspergillus species isolated, those belonging to section Flavi were predominant. Of the 150 strains of Aspergillus section Flavi isolated, 144 were identified as Aspergillus flavus and 6 as Aspergillus tamarii. We showed that 72% and 10% of the A. flavus strains produced AFs and CPA, respectively. Among the 150 strains tested, 60 produced amounts of AFB1 ranging from 12.1 to 234.6 microg/g of CYA medium. Also, we showed that most strains produced large sclerotia. AFB1was detected by HPLC in 56.6% of the wheat samples and derived products (flour, semolina and bran) with contamination levels ranging from 0.13 to 37.42 microg/kg.
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Affiliation(s)
- Amar Riba
- Laboratoire de Recherche sur les Produits Bioactifs et la Valorisation de la Biomasse, Ecole Normale Supérieure de Kouba, BP 92, 16050 Kouba, Alger, Algeria
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77
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Advances in molecular detection of Aspergillus: an update. Arch Microbiol 2010; 192:409-25. [DOI: 10.1007/s00203-010-0563-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2009] [Revised: 11/01/2009] [Accepted: 03/10/2010] [Indexed: 10/19/2022]
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78
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Hong SB, Kim DH, Park IC, Samson RA, Shin HD. Isolation and identification of Aspergillus section fumigati strains from arable soil in Korea. MYCOBIOLOGY 2010; 38:1-6. [PMID: 23956617 PMCID: PMC3741588 DOI: 10.4489/myco.2010.38.1.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2010] [Accepted: 02/02/2010] [Indexed: 06/02/2023]
Abstract
63 strains of Aspergillus section Fumigati were isolated from 17 samples of arable soil in a central province of Korea. Based on the results of genotypic and phenotypic analyses, they were identified as Aspergillus fumigatus, A. lentulus, Neosartorya coreana, N. fennelliae, N. fischeri, N. glabra, N. hiratsukae, N. laciniosa, N. pseudofischeri, N. quadricincta, N. spinosa and N. udagawae. Among these, N. fennelliae, N. hiratsukae, N. quadricincta, and N. udagawae had not been previously recorded in Korea. The diversity of Aspergillus section Fumigati species from arable soil in Korea is also addressed.
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Affiliation(s)
- Seung-Beom Hong
- Korean Agricultural Culture Collection, National Agrobiodiversity Center, NAAS, Suwon 441-707, Korea
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79
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Scientific Opinion on the maintenance of the list of QPS microorganisms intentionally added to food or feed (2009 update). EFSA J 2009. [DOI: 10.2903/j.efsa.2009.1431] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
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80
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Bircan C. Comparison of homogenization techniques and incidence of aflatoxin contamination in dried figs for export. FOOD ADDITIVES & CONTAMINANTS PART B-SURVEILLANCE 2009; 2:171-7. [DOI: 10.1080/19440040903280521] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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81
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Gil-Serna J, Vázquez C, Sardiñas N, González-Jaén MT, Patiño B. Discrimination of the main Ochratoxin A-producing species in Aspergillus section Circumdati by specific PCR assays. Int J Food Microbiol 2009; 136:83-7. [DOI: 10.1016/j.ijfoodmicro.2009.09.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Revised: 09/03/2009] [Accepted: 09/17/2009] [Indexed: 10/20/2022]
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82
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Use of a rep-PCR system to predict species in the Aspergillus section Nigri. J Microbiol Methods 2009; 79:1-7. [DOI: 10.1016/j.mimet.2009.07.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Revised: 07/07/2009] [Accepted: 07/07/2009] [Indexed: 11/19/2022]
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83
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Abstract
This review summarizes the health aspects of the medically important fungal genus Aspergillus. The morphology and systematics of the genus are explained as well as its biogeography. Major mycotoxins, the aspergilli that produce them, affected crops, and symptoms of the toxicoses are summarized, as are the major mycoses caused by aspergilli. The current status of the relationship between Aspergillus in the indoor environment and health issues are discussed.
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Affiliation(s)
- Maren A Klich
- USDA, ARS, Southern Regional Research Center, New Orleans, LA 70124, USA.
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84
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Bircan C. Incidence of ochratoxin A in dried fruits and co-occurrence with aflatoxins in dried figs. Food Chem Toxicol 2009; 47:1996-2001. [PMID: 19450651 DOI: 10.1016/j.fct.2009.05.008] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2009] [Revised: 04/21/2009] [Accepted: 05/13/2009] [Indexed: 11/24/2022]
Abstract
Ninety eight dried figs, 53 sultanas and 20 dried apricots destined for export from Turkey to the European Union were tested for ochratoxin A (OTA) contamination utilizing immunoaffinity column clean-up and high-performance liquid chromatography (HPLC). While only 2 (4%) of the sultanas exceeded the 10 ng g(-1) maximum limit set by the EU, 28 (53%) of 53 sultana samples contained detectable levels of OTA, in the range of 0.51-58.04 ng g(-1). Eighteen of 98 (18%) dried figs contained detectable levels of OTA, in the range of 0.87-24.37 ng g(-1). Only one of the 20 dried apricots was contaminated, with 0.97 ng g(-1) OTA. Dried figs analyzed for OTA were also tested for aflatoxin contamination to determine the co-occurrence of both toxins. Seven samples were confirmed aflatoxin positive, in the range of 0.23-4.28 ng g(-1), and only 2 samples contained both toxins, with a maximum concentration of 24.37 ng g(-1)for OTA and 1.02 ng g(-1) for aflatoxin B(1). The average recovery and relative standard deviation (RSD) obtained from dried fruits spiked with OTA ranged from 80.5% to 91.5% and 0.99-5%, respectively. The average recovery and relative standard deviation (RSD) obtained from dried figs spiked with aflatoxin ranged from 88.78% to 93.53% and 2.54-7.25%, respectively.
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Affiliation(s)
- Cavit Bircan
- Adnan Menderes University, Faculty of Agriculture, Department of Food Engineering, 09100 Aydin, Turkey.
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85
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Gil-Serna J, González-Salgado A, González-Jaén MT, Vázquez C, Patiño B. ITS-based detection and quantification of Aspergillus ochraceus and Aspergillus westerdijkiae in grapes and green coffee beans by real-time quantitative PCR. Int J Food Microbiol 2009; 131:162-7. [DOI: 10.1016/j.ijfoodmicro.2009.02.008] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2008] [Revised: 01/12/2009] [Accepted: 02/09/2009] [Indexed: 11/27/2022]
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86
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Montenegro G, Sánchez Puch S, Jewtuchowicz VM, Pinoni MV, Relloso S, Temporitti E, Iovannitti CA, Mujica MT. Phenotypic and genotypic characterization of Aspergillus lentulus and Aspergillus fumigatus isolates in a patient with probable invasive aspergillosis. J Med Microbiol 2009; 58:391-395. [PMID: 19208894 DOI: 10.1099/jmm.0.005942-0] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Characteristic morphological and phylogenetic analyses demonstrated the presence of Aspergillus fumigatus and Aspergillus lentulus as the aetiological agents in a case of probable invasive aspergillosis (IA). This is believed to be the first report of an A. lentulus strain isolated from a patient with probable IA in Argentina.
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Affiliation(s)
- Graciela Montenegro
- Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2150, Piso 11 (1121), Buenos Aires, Argentina
| | - Silvia Sánchez Puch
- Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2150, Piso 11 (1121), Buenos Aires, Argentina
| | - Virginia M Jewtuchowicz
- Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2150, Piso 11 (1121), Buenos Aires, Argentina
| | - Maria V Pinoni
- Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2150, Piso 11 (1121), Buenos Aires, Argentina
| | - Silvia Relloso
- Centro de Educación Médica e Investigaciones Clínicas 'Dr. Norberto Quirno' (CEMIC), Buenos Aires, Argentina
- Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2150, Piso 11 (1121), Buenos Aires, Argentina
| | - Elena Temporitti
- Centro de Educación Médica e Investigaciones Clínicas 'Dr. Norberto Quirno' (CEMIC), Buenos Aires, Argentina
| | - Cristina A Iovannitti
- Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2150, Piso 11 (1121), Buenos Aires, Argentina
| | - Maria T Mujica
- Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2150, Piso 11 (1121), Buenos Aires, Argentina
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87
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Figueroa M, González MDC, Rodríguez-Sotres R, Sosa-Peinado A, González-Andrade M, Cerda-García-Rojas CM, Mata R. Calmodulin inhibitors from the fungus Emericella sp. Bioorg Med Chem 2009; 17:2167-74. [DOI: 10.1016/j.bmc.2008.10.079] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2008] [Revised: 09/02/2008] [Accepted: 10/31/2008] [Indexed: 10/21/2022]
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88
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Combination therapy of advanced invasive pulmonary aspergillosis in transiently neutropenic rats using human pharmacokinetic equivalent doses of voriconazole and anidulafungin. Antimicrob Agents Chemother 2009; 53:2005-13. [PMID: 19237647 DOI: 10.1128/aac.01556-08] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
At present, voriconazole (VOR) is the drug of first choice for treating invasive pulmonary aspergillosis (IPA). However, particularly in advanced stages of disease and in the severely immunocompromised host, the mortality remains substantial. The combination of VOR with an echinocandin may improve the therapeutic outcome. We investigate here whether combining VOR and anidulafungin (ANI) in advanced IPA in transiently neutropenic rats results in a higher therapeutic efficacy. Since VOR is metabolized more rapidly in rodents than in humans, dosage adjustment for VOR is necessary to obtain an area under the plasma concentration-time curve (AUC) in rodents that is equivalent to that of humans. In this study, the pharmacokinetics of VOR and ANI in rats were elucidated, and dosage schedules were applied that produced AUCs similar to those of humans. The developed dose schedules were well tolerated by the rats, without effects on renal and hepatic functions. VOR showed excellent efficacy in early IPA (100% rat survival). In advanced IPA, VOR was less efficacious (50% rat survival), whereas a significant decrease in galactomannan concentrations in lungs and sera was found in surviving rats. ANI administered in advanced IPA resulted in 22% rat survival, and the serum concentrations of fungal galactomannan were slightly but not significantly decreased. The addition of ANI to VOR did not result in significantly increased therapeutic efficacy in advanced IPA, resulting in 67% rat survival and a significant decrease in galactomannan concentration in serum. In conclusion, VOR monotherapy is therapeutically effective in the treatment of advanced-stage IPA and superior to the use of ANI. Combining both agents does not significantly improve the therapeutic outcome.
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89
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Aislamiento de Aspergillus lentulus en España en un paciente crítico con enfermedad pulmonar obstructiva crónica. Rev Iberoam Micol 2008; 25:246-9. [DOI: 10.1016/s1130-1406(08)70058-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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90
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91
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Singaravelan N, Grishkan I, Beharav A, Wakamatsu K, Ito S, Nevo E. Adaptive melanin response of the soil fungus Aspergillus niger to UV radiation stress at "Evolution Canyon", Mount Carmel, Israel. PLoS One 2008; 3:e2993. [PMID: 18714346 PMCID: PMC2500164 DOI: 10.1371/journal.pone.0002993] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2008] [Accepted: 07/13/2008] [Indexed: 11/18/2022] Open
Abstract
Background Adaptation is an evolutionary process in which traits in a population are tailored by natural selection to better meet the challenges presented by the local environment. The major discussion relating to natural selection concerns the portraying of the cause and effect relationship between a presumably adaptive trait and selection agents generating it. Therefore, it is necessary to identify trait(s) that evolve in direct response to selection, enhancing the organism's fitness. “Evolution Canyon” (EC) in Israel mirrors a microcosmic evolutionary system across life and is ideal to study natural selection and local adaptation under sharply, microclimatically divergent environments. The south-facing, tropical, sunny and xeric “African” slope (AS) receives 200%–800% higher solar radiation than the north-facing, temperate, shady and mesic “European” slope (ES), 200 meters apart. Thus, solar ultraviolet radiation (UVR) is a major selection agent in EC influencing the organism-environment interaction. Melanin is a trait postulated to have evolved for UV-screening in microorganisms. Here we investigate the cause and effect relationship between differential UVR on the opposing slopes of EC and the conidial melanin concentration of the filamentous soil fungus Aspergillus niger. We test the working hypothesis that the AS strains exhibit higher melanin content than strains from the ES resulting in higher UV resistance. Methodology/Principal Findings We measured conidial melanin concentration of 80 strains from the EC using a spectrophotometer. The results indicated that mean conidial melanin concentration of AS strains were threefold higher than ES strains and the former resisted UVA irradiation better than the latter. Comparisons of melanin in the conidia of A. niger strains from sunny and shady microniches on the predominantly sunny AS and predominantly shady ES indicated that shady conditions on the AS have no influence on the selection on melanin; in contrast, the sunny strains from the ES displayed higher melanin concentrations. Conclusions/Significance We conclude that melanin in A. niger is an adaptive trait against UVR generated by natural selection.
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Affiliation(s)
| | | | - Alex Beharav
- Institute of Evolution, University of Haifa, Mount Carmel, Israel
| | - Kazumasa Wakamatsu
- Department of Chemistry, Fujita Health University School of Health Sciences, Toyoke Aichi, Japan
| | - Shosuke Ito
- Department of Chemistry, Fujita Health University School of Health Sciences, Toyoke Aichi, Japan
| | - Eviatar Nevo
- Institute of Evolution, University of Haifa, Mount Carmel, Israel
- * E-mail:
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92
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Three new species of Aspergillus from Amazonian forest soil (Ecuador). Curr Microbiol 2008; 57:222-9. [PMID: 18594910 DOI: 10.1007/s00284-008-9178-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2008] [Accepted: 04/20/2008] [Indexed: 10/21/2022]
Abstract
From an undisturbed natural forest soil in Ecuador, three fungal strains of the genus Aspergillus were isolated. Based on molecular and morphological features they are described as three new species, named A. quitensis, A. amazonicus, and A. ecuadorensis.
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93
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Abstract
This case report describes the fungal dermatitis caused by Neosartorya hiratsukae infection in a household hedgehog confirmed by microscopic examination of conidiophores and DNA analyses including the internal transcribed spacer region, partial beta-tubulin, and the calmodulin gene. It is the first report of a natural N. hiratsukae infection in animals.
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94
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Valdivia-Granda W. The next meta-challenge for Bioinformatics. Bioinformation 2008; 2:358-62. [PMID: 18685725 PMCID: PMC2478737 DOI: 10.6026/97320630002358] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2008] [Revised: 05/22/2008] [Accepted: 05/26/2008] [Indexed: 01/30/2023] Open
Abstract
The direct sequencing of uncultivable organisms present in complex biological and environmental samples has opportunities to discover new life forms and metabolic processes. This transformational field, known as metagenomics, is generating massive amounts of molecular information that can overwhelm the performance of conventional analysis and visualization algorithms. Here, I briefly highlight some of the emerging challenges this new discipline presents to the computational biology community and point some of the opportunities to develop applications that can translate metagenomic information into biomedical, agricultural, environmental, and industrial applications.
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95
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Aspergillus section Fumigati: antifungal susceptibility patterns and sequence-based identification. Antimicrob Agents Chemother 2008; 52:1244-51. [PMID: 18212093 DOI: 10.1128/aac.00942-07] [Citation(s) in RCA: 206] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
This study analyzed 28 Aspergillus strains belonging to the section Fumigati that were isolated from clinical samples in Spain. All isolates sporulated slowly and were unable to grow at 48 degrees C. Phylogenetic analysis based on sequencing of partial sequences of the beta-tubulin and rodlet A genes was used to classify the 28 strains into six different clades (Neosartorya hiratsukae, Neosartorya pseudofischeri, Aspergillus viridinutans, Aspergillus lentulus, Aspergillus fumigatiaffinis, and Aspergillus fumisynnematus). Antifungal susceptibility testing showed heterogeneous patterns and grouped the strains together by species. Most A. lentulus and A. fumigatiaffinis isolates showed high MICs of amphotericin B (geometric mean [GM] MICs, >or=4.5 microg/ml), itraconazole (GM MICs, >or=6 microg/ml), voriconazole (GM MICs, >or=3 microg/ml), and ravuconazole (GM MICs, >or=3 microg/ml); N pseudofischeri and A. viridinutans showed high MICs of itraconazole (GM MICs, >or=8 microg/ml), voriconazole (GM MICs, >or=3.33 microg/ml), and ravuconazole (GM MICs, >or=2 microg/ml); and N. hiratsukae and A. fumisynnematus were susceptible to all the antifungals tested. In conclusion, a number of different species whose morphological features resemble those of Aspergillus fumigatus could succeed in producing invasive infections in the susceptible host. In addition, some of them showed high MICs for most of the antifungals available for the treatment of patients infected with these organisms. The epidemiology and clinical relevance of these species should therefore be addressed.
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96
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Introduction of a Qualified Presumption of Safety (QPS) approach for assessment of selected microorganisms referred to EFSA - Opinion of the Scientific Committee. EFSA J 2007. [DOI: 10.2903/j.efsa.2007.587] [Citation(s) in RCA: 243] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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97
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Host–parasitoid interaction as affected by interkingdom competition. Oecologia 2007; 155:161-8. [DOI: 10.1007/s00442-007-0900-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2006] [Accepted: 10/15/2007] [Indexed: 10/22/2022]
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98
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Geiser DM, Klich MA, Frisvad JC, Peterson SW, Varga J, Samson RA. The current status of species recognition and identification in Aspergillus. Stud Mycol 2007; 59:1-10. [PMID: 18490947 PMCID: PMC2275194 DOI: 10.3114/sim.2007.59.01] [Citation(s) in RCA: 199] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
The species recognition and identification of aspergilli and their teleomorphs is discussed. A historical overview of the taxonomic concepts starting with the monograph of Raper & Fennell (1965) is given. A list of taxa described since 2000 is provided. Physiological characters, particularly growth rates and the production of extrolites, often show differences that reflect phylogenetic species boundaries and greater emphasis should be placed on extrolite profiles and growth characteristics in species descriptions. Multilocus sequence-based phylogenetic analyses have emerged as the primary tool for inferring phylogenetic species boundaries and relationships within subgenera and sections. A four locus DNA sequence study covering all major lineages in Aspergillus using genealogical concordance theory resulted in a species recognition system that agrees in part with phenotypic studies and reveals the presence of many undescribed species not resolved by phenotype. The use of as much data from as many sources as possible in making taxonomic decisions is advocated. For species identification, DNA barcoding uses a short genetic marker in an organism"s DNA to quickly and easily identify it to a particular species. Partial cytochrome oxidase subunit 1 sequences, which are used for barcoding animal species, were found to have limited value for species identification among black aspergilli. The various possibilities are discussed and at present partial beta-tubulin or calmodulin are the most promising loci for Aspergillus identification. For characterising Aspergillus species one application would be to produce a multilocus phylogeny, with the goal of having a firm understanding of the evolutionary relationships among species across the entire genus. DNA chip technologies are discussed as possibilities for an accurate multilocus barcoding tool for the genus Aspergillus.
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Affiliation(s)
- D M Geiser
- Department of Plant Pathology, Pennsylvania State University, University Park 16802, U.S.A
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99
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Frisvad JC, Larsen TO, de Vries R, Meijer M, Houbraken J, Cabañes FJ, Ehrlich K, Samson RA. Secondary metabolite profiling, growth profiles and other tools for species recognition and important Aspergillus mycotoxins. Stud Mycol 2007; 59:31-7. [PMID: 18490955 PMCID: PMC2275202 DOI: 10.3114/sim.2007.59.04] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Species in the genus Aspergillus have been classified primarily based on morphological features. Sequencing of house-hold genes has also been used in Aspergillus taxonomy and phylogeny, while extrolites and physiological features have been used less frequently. Three independent ways of classifying and identifying aspergilli appear to be applicable: Morphology combined with physiology and nutritional features, secondary metabolite profiling and DNA sequencing. These three ways of identifying Aspergillus species often point to the same species. This consensus approach can be used initially, but if consensus is achieved it is recommended to combine at least two of these independent ways of characterising aspergilli in a polyphasic taxonomy. The chemical combination of secondary metabolites and DNA sequence features has not been explored in taxonomy yet, however. Examples of these different taxonomic approaches will be given for Aspergillus section Nigri.
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Affiliation(s)
- J C Frisvad
- Center for Microbial Biotechnology, BioCentrum-DTU, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
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100
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Thrane U, Anderson B, Frisvad JC, Smedsgaard J. The exo-metabolome in filamentous fungi. TOPICS IN CURRENT GENETICS 2007. [DOI: 10.1007/4735_2007_0230] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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