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• W1556540220 abstract "Secondary metabolites and more specifically phenylpropanoids, in roots of Musa have been related to nematode resistance based on the differential presence of these compounds in the roots of resistant and susceptible cultivars. However, a strong biochemical basis for resistance has not yet been elucidated. The current study demonstrated biochemical differences in the phenylpropanoid pathway of secondary metabolism between cultivars resistant to the banana nematode Radopholus similis, 'Yangambi km5' and 'Pisang jari buaya', and the susceptible 'Grande naine'. Unlike previously reported results, lignification and preformed phenolic cells were not found to be specific features of the resistant cultivars. Accumulation of sinapic acid in the thickened cell walls of the endodermis and vascular elements was induced by nematode infection in both the resistant and the susceptible cultivars, while flavonoidcontaining cells in the vascular cylinder were only found in resistant cultivars after infection. 'Grande naine' roots contained the highest total phenolic content, which could be related to high amounts of proanthocyanidins. In 'Yangambi km5' roots, the proanthocyanidin and total phenolic content was the lowest, but mean amounts of total phenols increased after infection, unlike in the other cultivars. Resumen Metabolitos secundarios en rakes y sus implicaciones para la resistencia a nematodos en banana (Musa spp.) Metabolitos secundarios y mas espedficamente los fenilpropanoides, en sistemas radicales de Musa, han sido relacionados a la resistencia a nematodos, basados en la presencia diferencial de estos compuestos en las rakes de cultivares resistentes y susceptibles. Sin embargo, todavia no se cuenta con una fuerte base bioquimica que explique esta resistencia. El presente estudio muestra diferencias bioquimicas en la via del metabolismo secundario del fenilpropanoide entre cultivares resistentes al nematodo barrenador del banana Radopholus similis, 'Yangambi km5' y 'Pisang jari buaya', y el susceptible 'Grande naine'. A diferencia de reportes anteriores, no se encontro que la lignificacion y las celulas fenolicas preformadas esten espedficamente relacionadas con los cultivares resistentes. La acumulacion de acido sinapico en el engrosamiento de las paredes celulares de la endodermis y elementos vasculares, fue inducido por la infeccion de nematodos tanto en los cultivares resistentes coma susceptibles, mientras que celulas conteniendo flavonoides en el cilindro vascular fueron encontradas unicamente en cultivares resistentes despues de la infeccion. Las rakes de 'Grande naine' mostraron el mayor contenido de fenoles, la que pudo haber estado relacionado con altos niveles de proantocianidinas. En las rakes de 'Yangambi km5', la proantocianidina y el contenido total fenolico fue el mas bajo, pero los niveles totales promedio fenolicos aumentaron despues de la inoculacion, a diferencia de los otros cultivares." @default.
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• W1556540220 date "2005-01-01" @default.
• W1556540220 modified "2023-09-23" @default.
• W1556540220 title "Secondary metabolites in roots and implications for nematode resistance in banana (Musa spp.)" @default.
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