info:eu-repo/semantics/article
Efficiency of Chemical Ripener Action in Sugarcane. I. Growth and Quality Responses to Polaris Applied at Different Hours of the Day
Título en español.
Registro en:
10.46429/jaupr.v60i4.10490
Institución
Resumen
Immature sugarcane propagated by sand culture was treated with a single concentration of Polaris (N,N-bis [phosphonomethyl] glycine) at different hours of the day. Plants harvested 21 days thereafter showed significant growth and qualitative differences relating to the amount of sunlight received prior to chemical application. Ripening efficiency was progressively improved as the treatment time was delayed from 0630 to 1630 h. Growth repression was decreased as treatment time was delayed from 0630 to 1830 h. These trends were not appreciably altered by darkening the plants throughout the following day. Preillumination effects are tentatively explained in terms of a Polaris-stimulated transport of hormone-like substances diurnally activated or depleted in leaves. Tissue sucrose levels and acid invertase were extremely sensitive to Polaris but not to the hour of its reception. Foliar trehalase was increased by Polaris and further increased by applying it later in the day. Plantas inmaturas de caña de azúcar, sembradas en arena, se sometieron a un tratamiento con Polaris (N,N-bis [fosfonometil] glicina) en distintas horas del día. Las plantas se cosecharon 21 días más tarde. Se obtuvieron variaciones significativas en crecimiento y calidad en relación con la cantidad de luz que las plantas recibieron antes de la recepción de Polaris. La eficiencia madurativa mejoró progresivamente al retrasar el tiempo de aplicación de las 0630 h a las 1630 h. La supresión del crecimiento disminuyó al retrasar la aplicación hasta las 1830 h. Estas tendencias no se alteraron cuando las plantas se mantuvieron a obscuras durante el siguiente día. La sacarosa y la invertasa ácida revelaron una sensibilidad general a Polaris, pero no así a la hora de aplicación.