Effects of Tungsten and Molybdenum on Sucrose Content and Hydrolytic Enzymes of Immature Sugarcane

Título en español.

dc.creator
dc.date1965-10-01
dc.date.accessioned2022-11-04T15:35:54Z
dc.date.available2022-11-04T15:35:54Z
dc.identifierhttps://revistas.upr.edu/index.php/jaupr/article/view/13042
dc.identifier10.46429/jaupr.v49i4.13042
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/5125009
dc.descriptionVariable concentrations of tungsten and molybdenum were applied as foliar sprays to 12-week-old sugarcane grown in sand culture. The objectives were to evaluate both elements as in vivo inhibitors of amylase, invertase, and acid phosphatases, and to test further the hypothesis that such inhibition will result in increased sucrose content. Leaf and meristem samples were harvested just prior to initial treatment, and at 3, 9, and 27 days thereafter. Glucose-1-phosphatase and amylase were generally inhibited by both elements, and increased sucrose usually appeared as a consequence. Tungsten at 10 p.p.m. significantly increased sucrose in leaf and meristem at all posttreatment harvests. Molybdenum was a more effective phosphatase inhibitor than tungsten, but was less effective in promoting sucrose production. Molybdenum increased sucrose in meristem only. ß-glycerophosphatase and ATP-ase were stimulated by some of the treatments. This was totally unexpected since both enzymes are known to be inhibited by tungsten and molybdenum in vitro. Certain treatments appeared to reduce the enzymes' capacity to experience major fluctuations. The significance of this property and the stimulation of ATP-ase are discussed at length.en-US
dc.descriptionSe aplicaron tungsteno y molibdeno en concentraciones variables y en forma de aspersión, a caña de azúcar de 12 semanas de edad sembrada en arena. Los objetivos fueron evaluar ambos agentes inhibitorios de la amilasa, la invertasa y las fosfatasas ácidas, y continuar probando la hipótesis de que tal inhibición producirá un aumento en el contenido de la sacarosa. Se tomaron muestras de las hojas y del meristemo inmediatamente antes del tratamiento inicial, y 3, 9 y 27 días después. Por lo general, ambos elementos actuaron como inhibidores de la fosfatasa de glucosa-1 y la amilasa, produciéndose casi siempre, como resultado, un aumento en la sacarosa. El tungsteno, a una concentración de 10 ppm., aumentó significativamente el contenido de sacarosa en la hoja y en el meristemo de todas las cosechas que se hicieron después de terminados los tratamientos. Algunos de los tratamientos estimularon la B-glicerofosfatasa y la ATPasa. Tal reacción no se esperaba, porque se sabe que el tungsteno y el molibdeno actúan como inhibidores de ambas enzimas in vitro. Ciertos tratamientos aparentemente disminuyeron la capacidad de las enzimas para tolerar grandes fluctuaciones. Se discuten detalladamente el significado de esta propiedad y el estímulo de la ATP-asa.es-ES
dc.formatapplication/pdf
dc.languageeng
dc.publisherUniversity of Puerto Rico Mayagüez Campus Agricultural Experiment Stationen-US
dc.relationhttps://revistas.upr.edu/index.php/jaupr/article/view/13042/10773
dc.rightsDerechos de autor 2018 Journal of Agriculture of the University of Puerto Rico. (Etapa III)es-ES
dc.sourceThe Journal of Agriculture of the University of Puerto Rico; Vol. 49 No. 4 (1965): Vol. 49, No. 4, October 1965; 429-442en-US
dc.sourceJournal of Agriculture of the University of Puerto Rico; Vol. 49 Núm. 4 (1965): Vol. 49, No. 4, October 1965; 429-442es-ES
dc.source2308-1759
dc.source0041-994X
dc.source10.46429/jaupr.v49i4
dc.subjectSugarcane--Puerto Ricoen-US
dc.subjectHydrolytic enzymesen-US
dc.subjectHydrolasesen-US
dc.subjectMolybdenum--Puerto Ricoen-US
dc.subjectTungsten--Puerto Ricoen-US
dc.subjectFertilizersen-US
dc.titleEffects of Tungsten and Molybdenum on Sucrose Content and Hydrolytic Enzymes of Immature Sugarcaneen-US
dc.titleTítulo en español.es-ES
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion


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