ESTUDIO DE LA ACTIVIDAD DE DERIVADOS PIRIMIDÍNICOS FRENTE A HONGOS FITOPATÓGENOS.
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2020-10-19
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Jaén: Universidad de Jaén
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Las enfermedades ocasionadas por hongos fitopatógenos provocan grandes pérdidas económicas a nivel mundial. Buscando una alternativa viable en el control de estas enfermedades, el presente trabajo tiene como objeto evaluar el efecto de ocho derivados pirimidínicos (7a-d, 11a-b y 12a-b) sobre el crecimiento y esporulación de tres especies de hongos fitopatógenos (Fusarium oxysporum, Rhizopus sp., y Verticillium dahliae 2397), así como sobre la germinación y crecimiento de plántulas de Lactuca sativa. Estos ensayos se realizaron adicionando al medio de crecimiento los derivados a una concentración de 250 μg/ml. Los resultados mostraron que el derivado pirimidínico con mayor capacidad inhibitoria del crecimiento fúngico fue 12a, seguido del cobre comercial; los derivados 7b y 7c mostraron una inhibición del crecimiento fúngico intermedia. El efecto de los derivados pirimidínicos sobre la esporulación fue variable. En cuanto a la germinación de L. sativa, se alcanzó la máxima inhibición en 7b, 7c y 12a, siendo del 100% en el caso de 12a. Con respecto al crecimiento de plántulas de L. sativa, la máxima inhibición se produjo en 7b y 7c. Se evaluaron diferentes parámetros de crecimiento, y se observó que la elongación de la plántula fue el parámetro más sensible, siendo la radicular el órgano que mostró una mayor respuesta, y por tanto, el más recomendable para determinar en los ensayos de fitotoxicidad en L. sativa.
Diseases caused by phytopathogenic fungi cause large economic losses to world level. Looking for a viable alternative in the control of these diseases, the present work aims to evaluate the effect of eight pyrimidine derivatives (7a-d, 11a-b and 12a-b) on the growth and sporulation of three species of phytopathogenic fungi (Fusarium oxysporum , Rhizopus sp., and Verticillium dahliae 2397), as well as on germination and seedling growth of Lactuca sativa. These tests were carried out adding to the growth medium the derivatives at a concentration of 250 μg/ml. The results showed that the pyrimidine derivative with the highest inhibitory capacity for fungal growth was 12a, followed by commercial copper; the derivatives 7b and 7c showed intermediate inhibition of fungal growth. The effect of pyrimidine derivatives on sporulation was variable. Regarding germination of L. sativa, the maximum inhibition was reached in 7b, 7c and 12a, being of 100% in the case of 12a. Regarding the growth of L. sativa seedlings, the maximum inhibition occurred in 7b and 7c. Different growth parameters were evaluated, and it was observed that the elongation of the seedling was the most sensitive parameter, being the root the organ that showed a greater response, and therefore, the most recommended to determine in phytotoxicity tests in L. sativa.
Diseases caused by phytopathogenic fungi cause large economic losses to world level. Looking for a viable alternative in the control of these diseases, the present work aims to evaluate the effect of eight pyrimidine derivatives (7a-d, 11a-b and 12a-b) on the growth and sporulation of three species of phytopathogenic fungi (Fusarium oxysporum , Rhizopus sp., and Verticillium dahliae 2397), as well as on germination and seedling growth of Lactuca sativa. These tests were carried out adding to the growth medium the derivatives at a concentration of 250 μg/ml. The results showed that the pyrimidine derivative with the highest inhibitory capacity for fungal growth was 12a, followed by commercial copper; the derivatives 7b and 7c showed intermediate inhibition of fungal growth. The effect of pyrimidine derivatives on sporulation was variable. Regarding germination of L. sativa, the maximum inhibition was reached in 7b, 7c and 12a, being of 100% in the case of 12a. Regarding the growth of L. sativa seedlings, the maximum inhibition occurred in 7b and 7c. Different growth parameters were evaluated, and it was observed that the elongation of the seedling was the most sensitive parameter, being the root the organ that showed a greater response, and therefore, the most recommended to determine in phytotoxicity tests in L. sativa.