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1.
Bol. micol. (Valparaiso En linea) ; 27(2): 32-38, dic. 2012. ilus, tab
Article in Spanish | LILACS | ID: lil-679653

ABSTRACT

En este estudio se realizaron los primeros aislamientos del estado asexual del patógeno Neonectria fuckeliana asociado a cancros o ®revirado del pino¼ en plantaciones de Pinus radiata. Se caracterizaron morfológicamente las cepas del sinanamorfo semejante a Verticillium (Acremonium), obtenidas en cultivo in vitro a partir de peritecios. El material para los aislamientos consistió en trozos de corteza de P. radiata con presencia de peritecios, colectados en Toltén, región de La Araucanía, lugar donde se realizó el primer reporte de N. fuckeliana en Chile. Se utilizaron diez cepas del semejante a Acremonium para la caracterización morfológica, mediciones de estructuras fúngicas, ritmo de crecimiento in vitro y morfología de las colonias. Las colonias presentaron un micelio flocoso y ralo de bordes blanquecinos e irregulares, destacándose tres tipos de colonias, blancas, naranjo oscura y naranjo claro. Taxonómicamente, las cepas coinciden con las estructuras mencionadas en la literatura, caracterizándose por la presencia de glioconidios. Las fialides midieron entre 7 – 78,4 x 1,4 - 4,9 ìm. Los conidios, de formas ovoides y algunas bicelulares, midieron entre 4,2 - 8,4 x 2,6 - 3,5 ìm. El ritmo de crecimiento in vitro fue lento, completando su desarrollo a los 19 días con un promedio de 71 +/- 0,3 mm de diámetro, a una tasa de crecimiento diario de 3,8 mm. Los resultados obtenidos hacen necesario futuros estudios de carácter molecular para analizar la variabilidad genética poblacional que puede presentarse en Chile.


First Neonectria fuckeliana isolates in Chile. Strains of Acremonium obtained from in vitro peritecia culture were morphologically characterized. The samples were collected in Toltén, La Araucanía region, were Neonectria fuckeliana was first reported in Chile. The material used for the isolation came from pieces of Pinus radiata bark with peritecia. Ten Acremonium-like strains were used for characterization of fungal structures, in vitro growth and strains morphology. The colonies were a floccose mycelium and thin edges whitish and irregular, varying color highlighting three types of strains, white, dark orange and pale orange. Taxonomically, the strains match the structures referred in the literature, characterized by the presence of gliospores. The phialides dimensions ranged from 7 to 7.8 ìm long and 1.4 to 4.9 ìm wide. The conidio of ovoid shapes and some bicelular measured between 4.2 to 8.4 ìm in length and width 2.6 and 3.5 ìm. In vitro growth rates were slow, the complete development take19 days with a daily growth average of 71 +/-3 mm in diameter, at a rate of 3.8 mm. It is necessary future molecular studies to analyze the population genetic variation that may occur in Chile.


Subject(s)
Acremonium/isolation & purification , Acremonium/classification , Acremonium/growth & development , Acremonium/pathogenicity , Fungi/growth & development , Pinus/growth & development , Pinus/microbiology , Chile
2.
Rev. Soc. Bras. Med. Trop ; 42(1): 63-66, Jan.-Feb. 2009. tab
Article in Portuguese | LILACS | ID: lil-507367

ABSTRACT

Enzimas hidrolíticas secretadas por fungos têm um papel importante na patogenicidade das infecções. Objetivando avaliar a atividade enzimática foram testados 31 isolados de Acremonium mantidos na Coleção de Culturas University Recife Mycology. Fragmentos das culturas foram transferidos para caldo glicosado para reativação e posterior crescimento em meio ágar batata dextrose, para verificar viabilidade, pureza e confirmação taxonômica pela observação das características macroscópicas e microscópicas. Para detecção enzimática foram utilizados substratos de caseína do leite e gelatina para protease, amido para amilase e lecitina de soja para fosfolipase. Das 31 culturas, 26 (83,9 por cento) mantiveram-se viáveis e 24 (92,3 por cento) foram confirmadas taxonomicamente. Das 24 culturas, 12 (50 por cento) apresentaram atividade proteásica, duas (16,7 por cento) em caseína do leite, uma (8,3 por cento) em gelatina e nove (75 por cento) em ambos os substratos; 16 (66,7 por cento) degradaram amido. Nenhuma cultura apresentou atividade fosfolipásica. Conclui-se que espécies de Acremonium são capazes de produzir enzimas envolvidas na patogenicidade das infecções fúngicas.


Hydrolytic enzymes secreted by fungi play an important role in the pathogenesis of infection. With the aim of evaluating the enzymatic activity, 31 isolates of Acremonium stored in the University of Recife Mycology (URM) Culture Collection were tested. Culture fragments were transferred to glycoside broth for reactivation and further growth in potato dextrose agar medium in order to investigate viability and purity and to confirm the taxonomy through observing the macroscopic and microscopic characteristics. To detect enzymes, milk casein and gelatin were used as substrates for proteinase, starch for amylase and soy lecithin for phospholipase. Among the 31 cultures, 26 (83.9 percent) remained viable and 24 (92.3 percent) were confirmed taxonomically. Out of these 24 cultures, 12 (50 percent) presented proteinase activity, of which two (16.7 percent) were on milk casein, one (8.3 percent) on gelatin and nine (75 percent) on both substrates; 16 (66.7 percent) degraded starch. None of the cultures presented phospholipase activity. It was concluded that Acremonium species are able to produce enzymes that are involved in the pathogenicity of fungal infections.


Subject(s)
Acremonium/enzymology , Amylases/biosynthesis , Peptide Hydrolases/biosynthesis , Phospholipases/biosynthesis , Acremonium/classification , Acremonium/growth & development , Mineral Oil , Preservation, Biological/methods
3.
Rev. Inst. Med. Trop. Säo Paulo ; 37(3): 267-70, maio-jun. 1995. ilus
Article in English | LILACS | ID: lil-154370

ABSTRACT

Os autores registram caso de hialo-hifomicose subcutanea por Acremonium recifei em paciente branca, imunocompetente, natural da Bahia, com historia de traumatismo no dorso da mao direita. A lesao era indolor, com edema, inflamacao, presenca de fistulas, secrecao seropulenta, e ausencia de graos. O exame histopatologico mostrou hifas septadas hialinas pela hematoxilina-eosina...


Subject(s)
Humans , Female , Aged , Acremonium/classification , Antifungal Agents/therapeutic use , Dermatomycoses/therapy , Dermatomycoses/diagnosis
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