Cellulolytic, amylolytic and pectinolytic enzyme activities of deteriorating cassava roots

Se investigo el patron de cambios en las enzimas que degradan los polisacaridos durante el almacenamiento de raices de yuca, con tuberculos frescos y con tuberculos que habian sido almacenados por hasta 8 dias a 30 grados centigrados. En la mayoria de las 5 var. estudiadas, hubo un incremento inicial (seguido por una disminucion) en la actividad de todas las enzimas estudiadas (celulasa, amilasa, esterasa de pectina, poligalacturonasa); se detectaron actividades max. de degradacion durante los dias 4-6 de almacenamiento. El hecho de que los tuberculos frescos tambien poseen las actividades enzimaticas de degradacion conduce a la posibilidad de que la degradacion de los tejidos durante el almacenamiento de la yuca se deba a la accion combinada de enzimas del hospedante y de enzimas extracelulares. (RA-CIAT) spa

The pattern of changes in polysaccharide-degrading enzymes during storage of cassava roots was investigated in fresh tubers and in tubers stored up to 8 days at 30 degrees Celsius. In most of the 5 var. studied there was an initial increase (followed by a decrease) in the activity of all the enzymes studied (cellulase, amylase, pectin esterase, polygalacturonase); max. degrading enzyme activities were detected during the 4th-6th days of storage. The fact that fresh tubers also possess the degrading enzyme activities leads to the possibility that tissue degradation during storage of cassava is due to the combined action of host as well as extracellular enzymes. (AS) eng