isolation of ~richoderma sp. and actinomycetes from camation tdianthus caryophyllus) soil and evaluation in vitro of their antagonic activity against fusarium oxysporum. f. sp. dianthi aislamiento de trichoderma sp. y actinomycetes a partir de suelos de clavel (dianthus caryophyllus) y evaluación de su capacidad antagónica in vitro sobre fusarium oxysporum. f. sp. dianthi
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ID: 191295
2002
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Abstract
Uno de los problemas más limitantes en el cultivo de clavel en Colombia es el marchitamiento vascular causado por Fusarium oxysporum f. sp. dianthi (Foxd) el método empleado actualmente para controlar y/o prevenir esta enfermedad es la aplicación de fungicidas, los cuáles no son tan efectivos como se espera y al emplearse en exceso causan daños al medio ambiente. Por lo tanto el uso de poblaciones microbianas nativas para controlar esta enfermedad se perfila corno una alternativa importante en los programas de erradicación de la enfermedad. Algunas especies de Trichoderma y de Actinomycetes, se han estudiado, por la capacidad de producir sustancias inhibitorias del crecimiento y/o la actividad de este fitopatógeno. En este estudio se aislaron diversas cepas de estos microorganismos controladores y se evaluó in vitro su actividad antagónica.<br />Se aislaron seis cepas de Trichoderma y treinta de Actinomycetes a partir de la rizósfera de diferentes<br />cultivos de clavel de la Sabana de Bogotá; la inhibición del crecimiento de Foxd fue evaluada in vitro por medio de la interacción hongo-hongo y actinomycete-hongo al medir el porcentaje de inhibición micelial (%MI)) y la formación de un halo de inhibición alrededor del crecimiento de Foxd. Los aislamientos de Trichoderma sp y Actinomycetes mostraron un %MI mayor al 50%. El aislamiento VI de Trichoderma sp (T-VI) presentó un %MI del 89% mientras que el aislamiento VII de Actinomycetes (A-VII, identificado como Streptomyces<br />sp) alcanzó un %MI del 91%, un halo de inhibición mayor a 1cm. Posteriormente, fue imposible determinar la actividad antagónica en asociación entre los aislamientos T-VI y A-VII debido al efecto inhibitorio de Streptomyces sp sobre Trichoderma sp. <br />
One of the major problems of the carnation crop in<br />Colombia is the vascular wilt disease caused by Fusarium<br />oxysporum f.. sp. dianthi (Foxd). Since the only method currently used to control andlor prevent the disease is the application offungicides, which are not as effective as expected and when used in excess causing asevere environmental damage, the alternative of using native microbiaJ populations for the control is a very interesting perspective. Among these biological agents, Trichoderma sp. and some actinomycetes have been studied due to their ability to produce substances that inhibit the growth andlor activity ofthis phytopathogen. In this study several strains of both kinds of biological agents were isolated and tested for antagonistic activity in vitro. Six Trichoderma sp strains and thirty different actinomycetes were isolated from soils of three carnation crops farms of the Bogota Plateau. Inhibition of Foxd growth was evaluated in vitro by measuring the mycelium inhibition rate (%MI) and the inhibition zone of<br />Foxd growing in contact with the putative antagonists in fungi-fungi and fungi-actinomycete interactions. We found that al! Trichoderma sp and actinomycetes isolates exhibited an %MI greater than 50%. Isolate VI of Trichoderma sp (TVI) reached an %MI as high as 89% while isolate VII of actinomycetes (AVII, later identified as Streptomyces sp) reached an %MI of 91% with an inhibition zone greater than 1 cm. Furthermore, it was impossible to determine the<br />associated antagonistic activity ofTVI and AVII isolates<br />cultured together because the latter inhibited the growth<br />of the former. <br />
One of the major problems of the carnation crop in<br />Colombia is the vascular wilt disease caused by Fusarium<br />oxysporum f.. sp. dianthi (Foxd). Since the only method currently used to control andlor prevent the disease is the application offungicides, which are not as effective as expected and when used in excess causing asevere environmental damage, the alternative of using native microbiaJ populations for the control is a very interesting perspective. Among these biological agents, Trichoderma sp. and some actinomycetes have been studied due to their ability to produce substances that inhibit the growth andlor activity ofthis phytopathogen. In this study several strains of both kinds of biological agents were isolated and tested for antagonistic activity in vitro. Six Trichoderma sp strains and thirty different actinomycetes were isolated from soils of three carnation crops farms of the Bogota Plateau. Inhibition of Foxd growth was evaluated in vitro by measuring the mycelium inhibition rate (%MI) and the inhibition zone of<br />Foxd growing in contact with the putative antagonists in fungi-fungi and fungi-actinomycete interactions. We found that al! Trichoderma sp and actinomycetes isolates exhibited an %MI greater than 50%. Isolate VI of Trichoderma sp (TVI) reached an %MI as high as 89% while isolate VII of actinomycetes (AVII, later identified as Streptomyces sp) reached an %MI of 91% with an inhibition zone greater than 1 cm. Furthermore, it was impossible to determine the<br />associated antagonistic activity ofTVI and AVII isolates<br />cultured together because the latter inhibited the growth<br />of the former. <br />
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| Authors | ;Márquez Marcela;Martínez María Mercedes;Franco Marcela |
| Journal | Indian journal of pediatrics |
| Year | 2002 |
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| Keywords | Keywords not found |
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