Plant pathogens of numerous plants, particularly grasses. cons. The ascospores are flagelliform or filiform, hyaline in nature and are found in clavate-shaped or cylindrical asci. and Triticum aestivum L., in which dark brown necrotic lesions were observed. These species have inter-specific fertility, however only 1% of attempted crosses between species were fertile (Nelson, 1960b), but gene flow between related species does appear to take place (Turgeon and Berbee, 1998). The hyphae are septate and brown. (2013). The thickened branches correspond to parsimony and maximum likelihood bootstrap support values 60 % and Bayesian posterior probability values 0.7. Species recognition in Bipolaris has been problematic due to a lack of molecular data from ex-type cultures, the use of few gene regions for species resolution and overlapping morphological characters. GPDH has been determined to be the best single phylogenetic marker of Bipolaris species (Manamgoda, Fungal Descriptions and Antifungal Susceptibility, Mould Identification: A Virtual Self Assessment. One of several “graminicolous” species common on plant material, particularly grasses. Curvularia. NOTE Brown spot, caused by Bipolaris oryzae (Breda de Haan) Shoemaker, is a well-known fUngal disease in Brazil (RIBEIRO, … Conidiophores (4.5-6 µm wide) are brown, simple or branched, geniculate and sympodial, bending at the points where each conidium arises from. 14-11 ). The genus Bipolaris contains about 45 species, which are mostly subtropical and tropical plant parasites. Seven new combinations are introduced in the genus Curvularia to accomodate the species of Bipolaris transferred based on the phylogenetic analysis. Microscopic examination helps to differentiate between the fun- gal species Bipolaris, Drechslera, and Exserohilum and identify characteristics of conidial shape, the presence or absence of a protruding hilum, the con - tour of the basal portion of the conidium and hilum, and the point where the germ tube originates from the basal cell.6,7 Therefore, there is a strong need to identify a potential barcode marker which will help in identification of Bipolaris species. This group of Bipolaris species has already gone through a lot of taxonomic refinement for last one decade; still there is confusion in morphological characters. 33:882(1959). Species recognition in the genus has been uncertain due to the lack of molecular data from ex-type cultures as well as overlapping morphological characteristics. However, this procedure may not be useful when comparisons are made with inaccurate sequences or when sequences of authentic strains of the species to which the problem isolate belongs have not been deposited. J. Bot. Excluded and doubtful species are listed with notes on taxonomy and phylogeny. **Conidia are septate from one side wall to other (not distoseptate) The surface of the colony is initially white to grayish brown and becomes olive green to black with a raised grayish periphery as it matures. 261p. Species 2012, 2014). Link/Page Citation. Morphological Identification of Bipolaris Species Associated with Maize Leaf Spot A total of 1186 Bipolaris single-spore isolates were obtained from all the collected maize leaf spot samples (Table 1 and Figure S1). Bipolaris is one of the causative agents of phaeohyphomycosis. A taxonomic key is provided for the morphological identification of species within the genus. Fungi growth resembling Bipolaris or Drechslera spp. Bipolaris spp. 2012). by . 371 Ciência Rural, v.41, n.3, mar, 2011. of B. curvispora are Melinis munitiflora (Beauv), Panicum maximum Jacq., Setaria spp. Bipolaris spp are the pathogens causing number of diseases in graminaceous crops. The correlation between the morphological and molecular identification was 89.7%. species in the genera Alternaria, Bipolaris, Curvularia, Drechslera, Exserohilum, and Fusarium have been investigated for mycotoxins than those in the other fungal genera (Sivanesan 1991). Comments The hyphae may be branched or constricted at points of septations [462]. The clinical spectrum is diverse, including allergic and chronic invasive sinusitis, keratitis, endophthalmitis, endocarditis, endarteritis, osteomyelitis, meningoencephalitis, peritonitis, otitis media (in agricultural field workers),and fungemia as well as cutaneous and pulmonary infections and allergic bronchopulmonary disease. In the past, morphological differentiation of the genera relied upon a combination of characters including conidial shape, the presence or absence of a protruding hilum, the contour of the basal portion of the conidium and its hilum, the point at which the germ tube originates from the basal cell and, to a lesser degree, the sequence and location of the first three conidial septa. Moreover, identification key has been prepared for Bipolaris species with 3–4 distoseptate and phylogenetic relationships of some Bipolaris species based on sequencing of rDNA-ITS region is provided. C. intermedia and C. heteropogonicola were identified on graminicolous species. A healthy 55-year-old man suffered a superficial skin abrasion to the left medial ankle while working at a sewage treatment plant. It is cosmopolitan in nature and is isolated from plant debris and soil. CRICOS Provider Number 00123M, ITS sequencing may be used to identify clinical species (da Cunha, 2012a). The predominant species was Bipolaris spicifera (70 isolates, 67.3%), followed by B. hawaiiensis (19 isolates, 18.2%), B. cynodontis (9 isolates, 8.6%), B. micropus (3 isolates, 2.9%), B. australiensis (2 isolates, 2%), and B. setariae (1 isolate, 1%). A new species of Bipolaris from Heliconia rostrata in India Singh R1 and Kumar S2 1Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi – 221005, Uttar Pradesh, India 2Department of Forest Pathology, Kerala Forest Research Institute, Peechi- 680653, Kerala, India Singh R, Kumar S 2016 − A new species of Bipolaris from Heliconia rostrata in India. Marijuana use has been noted as a possible risk factor. Other reports of B. curvispora distribution 2012a). was isolated and identified at the species level. Brown spot was reported by Petrak for the first time in Iran (Safari Motlagh and Kaviani, 2008b). Dematiaceous fungi Cladosporium species, Bipolaris hawaiiensis, Schizophyllum commune, and members of Scedosporium apiospermum complex are common saprobes in soil, and pathogens of plants and infective propagules can be air transported.S. Phaeoid hyphae (diameter: 2-6 µm) with frequent septations are observed. Skip to search form Skip to main content > Semantic Scholar's Logo. The sesterterpenetype ophiobolins - constitute one of the most remarkable groups of these bioactive metabolites. This property leads to the zigzag appearance of the conidiophore. No special precautions other than general laboratory precautions are required. The genus Curvularia contains about 80 species, which are mostly soil or plant pathogens. Phylogenetic analysis of the isolates. Key Features: Dematiaceous hyphomycete producing sympodial, pseudoseptate, pale brown, straight, fusiform to ellipsoidal conidia, which are rounded at both ends. Carbon source assimilation of the human pathogenic Cochliobolus isolates. were used in the identification of the species. Recent studies have shown that morphological identification does not correlate with molecular identification (Manamgoda et al. Genus: Bipolaris. In addition, species of Aspergillus can produce aflatoxins (Pitt 1991). A worsening course over the following 3 weeks prompted referral to the authors’ facility for further evaluation. 1996; 22 (S2): S179-84. Comment:The genera Drechslera, Bipolaris, Curvularia and Exserohilum are all closely related. They produce various terpenoid compounds, such as sesquiterpenes, diterpenes and sesterterpenes. prasert stavornvisit . Moreover, identification key has been prepared for Bipolaris species with 3-4 distoseptate and phylogenetic relationships of some Bipolaris species based on sequencing of rDNA-ITS region is provided. These data suggest that itraconazole MICs are variable and voriconazole MICs are considerably low [1864]. Species of Bipolaris are cosmopolitan and distributed throughout a broad range of environments.Bipolaris species are pathogens, saprobes or endophytes of a wide range of hosts (Hyde et al. The abrasion progressed to a shallow ulcer with surrounding erythema over the next 4 to 5 days. Amphotericin B and ketoconazole are used in treatment of Bipolaris infections. It is cosmopolitan in nature and is isolated from plant debris and soil. In recent years, many DNA sequences from ex-type or refer- ence cultures of Bipolaris species have been made available in GenBank (Manamgoda et al. associated with rice seeds in Rio Grande do Sul State, Brazil. Abstract. ***Have erect conidiophores. associated with rice seeds in Rio Grande do Sul State, Brazil. 1. References: Ellis (1971, 1976), Luttrell (1978), Domsch et al. (1986b), Sivanesan (1987), Rippon (1988), de Hoog et al. Bipolaris is one of the causative agents of phaeohyphomycosis. Bipolaris sorokiniana (Sacc) Schoem, and another fungus Bipolaris bicolor (Mitra) Shoem that has been also isolated from wheat seeds. 2014). 2014). Bipolaris species associated with rice plant_____ J. Exserohilum: Approx. Identification of Dematiaceous Fungi and Their Role in Human Disease. Chemically, sterigmatocystin resembles the aflatoxins and is thought to be a precursor in the biosynthesis of aflatoxin. (2012, 2014), da Cunha et al. Microscopic morphology shows sympodial development of hyaline to deep olivaceous pigmented, pseudoseptate conidia on a geniculate or zig-zag rachis. species in the genera Alternaria, Bipolaris, Curvularia, Drechslera, Exserohilum, and Fusarium have been investigated for mycotoxins than those in the other fungal genera (Sivanesan 1991). Bipolaris colonies grow rapidly, reaching a diameter of 3 to 9 cm following incubation at 25°C for 7 days on potato dextrose agar. Morphological Description: Colonies are moderately fast growing, effuse, grey to blackish brown, suede-like to floccose with a black reverse. Very limited data are available on susceptibility of Bipolaris. Bipolaris can infect both immunocompetent and immunocompromised host. 2006; 18(1):19-24. In vitro susceptibility testing procedures have not been standardized for dematiaceous fungi yet. The species most closely related to Bipolaris victoriae is Bipolaris carbonum. Cochliobolus carbonum (anamorph: Helminthosporium carbonum) is one of more than 40 species of filamentous ascomycetes belonging to the genus Cochliobolus (anamorph: Bipolaris/Curvularia).This pathogen has a worldwide distribution, with reports from Australia, Brazil, Cambodia, Canada, China, Congo, Denmark, Egypt, India, Kenya, New Zealand, Nigeria, Solomon Islands, and the United States. It is cosmopolitan in nature and is isolated from plant debris and soil. 2012; Yanagihara et al. The microscopic spores they use … The genus Bipolaris contains several species. rDNA sequencing has been used as a main tool to identify fungi and discriminate related species [7,8]. Regional survey and identification of Bipolaris spp. 8 species. With 47 identified species, Bipolaris species are best known as plant pathogens that can be found in plant debris, soil, and a variety of other materials. … Correct species identification in this genus has always proven difficult, mostly relying on morphology and plant host association. Other reports of B. curvispora distribution The preliminary morphological identification of the UM 226 isolate was confirmed by PCR amplification of the ITS, SSU and LSU gene regions, which yielded specific amplicons of ∼540 (ITS), 1,200 (SSU) and 900 bp (LSU), respectively (Supplementary Fig. , suede-like to floccose with a black reverse B and ketoconazole are used in treatment of Bipolaris species and hawaiiensis... 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Following 7 days in medium availability of ex-type cultures 462 ] to study genera with complex taxonomy the Curvularia! Produce leaf spots, leaf blights and root... that assignment was probably a misidentification recent years, biology.
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