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Estudio del antagonismo de algunas especies de Trichoderma sobre Fusarium Oxysporum y Rhizoctonia Solani Antagonism studies of Trichoderma sp.p.. with Fusarium oxysporum and Rhizoctonia solani  [cached]
Elias Ricardo,Arcos Omar,Arbelaez Germán
Agronomía Colombiana , 1989,
Abstract: En este trabajo se estudió el antagonismo de algunos aislamientos del hongo Trichoderma obtenidos de suelos colornbianos en el control de Fusarium oxysporum y Rhizoctonia solani. En los ensayos "in vitre" se observó un marcado antagonismo entre las colonias de los aislamientos de Trichoderma sobre R. sotsni, con una reducción apreciable del tama o de la colonia y un antaqonismo menor sobre F. oxysporum. En los ensayos de parasitismo a nivel microscópico, se observó una gran interacción entre alqunos de los aislamientos de T. harzianum y T. hamatum y el patógéno R. solani rnanifestado por el enrollamiento, penetración, fragmentación y lisis de las hifas del patoqeno. Los aislamientos de Trichoderma causaron un retraso en la aparición de los síntomas, una reducción en la severidad de la enfermedad. y un menor número de plantas enfermas ocasionadas por F. oxysporum f. sp, cucumerinum en pepino cohombro, y su efecto fue superior en todos los casos a la aplicación del fungicida benomil. Los aislamientos del antagonista aumentaron la qerminación de las semillas, la emergencia y el tama o de las plántulas y redujeron la severidad de la enfermedad ocasionada por R. solani en fríjol. Several experiments were conducted to study the antagonism of 17 isolates of Trichoderma from Colombian soils with Fusarium oxysporum and Rhizoctonia solani. In "in vitro" tests, a high antagonism between colonies was found being greater the antagonism of Trichoderma with R. solani. At the microscopic level it was observed a great interaction between T. harzianum and T. hamatum with R. solani in such a way that the hyphae of the pathogen showed coiling, penetration, fragmentation and lysis. The Trichoderma isolates caused reduction in the disease severity, in the incubation period and a lower number of diseased cucumber plants when they were inoeulated with F. oxysporum f. sp, cucumerinum and these effects were better than Benomyl application. The same Trichoderma isolates increased seed germination, emergence and seedling size of bean plants inoculated with R. solani. A reduction of the disease severity was also found.
Sele??o de antagonistas fúngicos a Fusarium solani e Fusarium oxysporum em substrato comercial para mudas
Ethur, Luciana Zago;Blume, Elena;Muniz, Marlove Fátima Bri?o;Flores, Maria Georgina Veiga;
Ciência Rural , 2007, DOI: 10.1590/S0103-84782007000600047
Abstract: tests in vitro are usually used for the initial selection of biocontrol agents against soil fungi, lacking methodologies using soil and/or substrate. the objective of this research was to accomplish the mass selection of fungi isolates antagonistic to f. solani and f. oxysporum in commercial substrate for seedlings. two experiments were conducted, with the pathogens f. solani and f. oxysporum, and 98 possible antagonistic fungi of the genera penicillium claviforme, penicillium, aspergillus and cladosporium. the suspension of the pathogens was inoculated in the substrate, in plastic cups, and the suspension of the other fungi was added five days later. the number of colony-forming unit of f. solani and f. oxysporum/g of substrate was counted after nine days. of the 98 isolates used against f. solani, 43% did not differ from the control, and 57% reduced its development in the substrate, with the three best isolates belonging to the genus penicillium claviforme. the three isolates of penicillium claviforme selected for f. solani were also efficient against f. oxysporum.
Evaluation of chitinase activity in biological control process of rhizoctonia solani y fusarium oxysporum f. sp. lycopersici in tomate, by using seed priming in the presence of trichoderma koningii Evaluación de la actividad quitinasa en procesos de control biológico de rhizoctonia solani y fusarium oxysporum f. sp. lycopersici en tomate, mediante fitoinvigorización de semillas en presencia de trichoderma koningii
Clavijo A.,Cotes A. M.
Revista Colombiana de Biotecnología , 1998,
Abstract: The present work intended to establish in a control model, the possible role of chitinases by using seed priming in the presence of Trichoderma koningii. This method showed to be efficient to control Rhizoctonia solani and Fusarium oxysporum in tomato. The analysis of seed extracts and exudates, and soil extracts from soil seeded with seeds primed in the presence of T. koningii showed high endochitinase activity in the samples. This activity was higher than that exhibited by samples from primed seeds without antagonist and unprimed seeds. In vitro evaluation of the hydrolytic activity of the extracts and exudates were performed using F. oxysporum and R. solani cell walls. The results also showed that the samples from seeds primed in the presence of T. koningii exhibited higher endochitinase activity than the others. These data allowed us to conclude that seed priming in the presence of T. koningii promotes endochinolytic activity in seeds. It was also concluded that this chitinase activity is related with the protection previously observed. El propósito del presente trabajo fue el de establecer el posible papel de las quitinasas en un modelo de control, utilizando pregerminación controlada de semillas en presencia de Trichoderma koningii. Este método mostró ser eficiente para el control de Rhizoctonia solani y de Fusarium oxysporum en tomate. Al analizar los extractos y exudados de semillas y los extractos de suelo sembrado con semillas pregerminadas en presencia de T. koningii, se encontró que éstos presentaron niveles significativamente mayores de actividad endoquitinasa que los provenientes de semillas pregerminadas en ausencia del antagonista y que los provenientes de semillas no pregerminadas. Al evaluar in-vitro la actividad hidrolítica de dichos extractos y exudados, utilizando paredes celulares de R. solani y de Fusarium oxysporum, los provenientes de semillas pregerminadas en presencia de T. koningii también mostraron significativamente mayor actividad endoquitinasa que la presentada en los otros tratamientos. Se pudo concluir que la pregerminación controlada de semillas en presencia de T. koningii estimula la actividad endoquitinolítica de las semillas y que esta actividad quitinasa estuvo relacionada con la protección previamente obtenida.
Fusarium wilt of water melon caused by Fusarium solani in Hungary
Gy. Turóczi, K. Posta, L. Badenszky, R. Bán
Plant Breeding and Seed Science , 2011, DOI: 10.2478/v10129-011-0012-3
Abstract: Water melon growers in Hungary have been recently reported a disease resembling that of Fusarium wilt developed on Fusarium resistant cultivars. Diseased samples from different regions of Hungary were collected in 2008 and 2009. The pathogen has been successfully isolated and identified as Fusarium solani. All of the isolates are host specific, but are very aggressive on water melon cultivars resistant to F. oxysporum f.sp. niveum. Severe infections occurred only in those fields where water melon has been grown continously for several years, but the pathogen is present in the soil of other fields as well.
Control biológico del marchitamiento vascular del clavel ocasionado por Fusarium oxysporum f.sp. dianthi con aislamientos no patogenicos de Fusarium oxysporum  [cached]
Rodríguez Juan Carlos,Rodríguez Lobo Pedro,Rojas Jaime,Sánchez José Luis
Agronomía Colombiana , 1993,
Abstract: Una de las estrategias para el control del marchitamiento vascular del clavel, ocasionado por Fusarium oxysporum f.sp. dianthi, es mediante el uso de algunos métodos biológicos. Para dicho control, se han utilizado diversos organismos como Pseudomonas putida (Scher y Baker, 1982), Seffatia liquefasciens (Sneh et al, 1985), Bacillus subtilis (Filippi et al, 1987), Streptomyces griseovindis (Lahdempera, 1987) y algunas especies de Trichoderma (Elfas et al, 1989). Igualmente, diversos investigadores han encontrado resultados satisfactorios de control de algunas formas especiales de Fusarium oxysporum, con aislamientos no patógenos de Fusariumoxysporum, Fusarium solani y Fusarium spp., tales como F. oxysporum f.sp. gacioli (Magie, 1980), F. oxysporum f.sp. melonis (Alabouvette, 1986; LiyZhang, 1990), F. oxysporum f.sp. cucumerinum (Paulitz et al, 1987), F. oxysparum r.sp. batatas (Ogawa y Komada, 1988) y Fusarium oxysporum f.sp. radicisiycopersici (Louter y Edginton, 1990).
Fusarium solani breast abscess  [cached]
Anandi V,Vishwanathan P,Sasikala S,Rangarajan M
Indian Journal of Medical Microbiology , 2005,
Abstract: An unusual manifestation of breast fusariosis was encountered in a 55-year-old female diabetic patient. Two fine needle aspirates (FNA) from the abscess were done at three days interval and they showed hyaline, septate, branched, fungal hypahe in 10% potassium hydroxide mount. Fungal infection was confirmed by demonstrating the fungal hyphae in the midst of lymphocytes, macrophages and neutrophils in Leishman stained smears. Culture of both FNAs yielded a heavy and pure growth of Fusarium solani . The patient responded to oral ketoconazole 200 mg once daily for 3 weeks. The breast fusariosis reported here is presumably the first case in India.
Hialohyfomikoza podudzia wywo ana przez Fusarium solani
Maria Dynowska
Medical Mycology , 1998,
Abstract: W polskiej literaturze mo na znale jedynie ogólne wzmianki o hialohyfomikozach, czyli zaka eniach wywo anych przez grzyby o strz pkach hialinowych. S to rzadkie zaka enia spowodowane m.in. przez grzyby z rodzaju Fusarium (wa ne patogeny ro lin), których g ównym rezerwuarem jest gleba ró nych stref klimatycznych. Zmienno morfologiczna i fizjologiczna sprawia, e s to grzyby niezwykle plastyczne i ekspansywne, zdolne do rozwoju na ró nych pod o ach organicznych. Nale do polifagicznych, fakultatywnych paso ytów ro lin mog cych atakowa tak e organizm cz owieka i innych zwierz t. Jako czynniki etiologiczne najcz ciej wymienia si F. culmorum, F. oxysporum, F. avenaceum, rzadziej F. solani. Ten ostatni wyizolowano z ropiej cej i nie goj cej si rany podudzia powsta ej w wyniku zak ucia such odyg kopru. F. solani mo e by przyczyn keratomikozy (w klimacie umiarkowanym najcz ciej pojawia si na terenach rolniczych), licznych zmian skórnych, zapalenia wewn trznych struktur oka i stawów. Wykazuje tendencje do zajmowania naczyń krwiono nych, co jest przyczyn zakrzepów i martwicy tkanek. W omawianym przypadku grzybów nie wyhodowano z posiewów krwi.
Diversity of Fusarium species in Cultivated Soils in Penang
Latiffah, Z.,Mohd Zariman, M.,Baharuddin, S.
Malaysian Journal of Microbiology , 2007,
Abstract: Fusarium species were isolated from 12 cultivated soil planted with different crops in Penang. A total of 42 Fusarium isolates were recovered in which four Fusarium species were identified namely, F. solani, F. semitectum, F. equiseti and F. oxysporum. The most prevalent Fusarium species recovered was F. solani (84%), followed by F. semitectum (7%), F. equiseti (7%) and F. oxysporum (2%). The present study showed that Fusarium populations are diverse within cultivated soils and could be potential inoculum to infect certain agriculture crops.
Identification of genetic variability among isolates of Fusarium oxysporum f. sp. vasinfectum of cotton
Bibanco, Kelen R.P;Nunes, Maria Paula;Cia, Edivaldo;Pizzinatto, Maria A;Schuster, Ivan;Mehta, Yeshwant R;
Tropical Plant Pathology , 2010, DOI: 10.1590/S1982-56762010000400006
Abstract: fusarium wilt of cotton caused by fusarium oxysporum f.sp. vasinfectum (fov) causes yield losses, especially in the states of s?o paulo and paraná. the disease can mainly be controlled by the use of resistant cultivars, and knowledge regarding the genetic diversity among isolates of the pathogen has become essential. diversity among 15 isolates collected from different brazilian cotton-producing states was studied along with one isolate of f. solani, using molecular techniques. the results of rapd, pcr-rflp of rdna, eric and rep-pcr were comparable with each other and indicated the existence of genetic variability among some of the fov isolates of different geographic origins. this indicates the necessity of using different fov isolates that represent the genetic diversity of the population, while screening cultivars for genetic resistance against this disease, so that only cultivars that are resistant to isolates from different geographic origins may be used in breeding programs.
Incidência de Fusarium solani em mandioca no estado do Pará
POLTRONIERI, LUIZ S.;TRINDADE, DINALDO R.;ALBUQUERQUE, FERNANDO C.;DUARTE, MARIA L.R.;CARDOSO, SHIRLEY. S.;
Fitopatologia Brasileira , 2002, DOI: 10.1590/S0100-41582002000500019
Abstract: this paper describes for the first time the occurrence of fusarium solani infecting cassava (manihot esculenta) in the state of pará.
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