Nitrogen metabolism in roots and leaves of green bean plants exposed to different phosphorus doses

El objetivo de este trabajo fue determinar el efecto de diferentes dosis de fosforo sobre la asimilacion de nitrogeno en raices y hojas de frijol ejotero (Phaseolus vulgaris L. cv. Strike). El fosforo fue aplicado a la solucion nutritiva en la forma de H3PO4; se usaron las siguientes dosis: P1 = 0.40 mM; P2 = 0.80 mM; P3 = 1.60 mM; P4 = 3.20 mM; P5 = 4.80 mM y P6 = 6.40 mM de P. Nuestros resultados indican que tanto los tratamientos de deficiencia y toxicidad de P presentaron respuestas similares en la asimilacion de N. Estos resultados definen la interaccion P-NO3 - que se produce a nivel de absorcion y movilizacion como el principal efecto que ejerce este macronutriente sobre la asimilacion de N. Tanto la deficiencia (P1) como la toxicidad (P6) de P redujeron la absorcion radical de NO3 - en un 15% y 36% respectivamente en relacion a la dosis optima (P3), reduciendo asi la disponibilidad de NO3 - para ser asimilado. Nuestros resultados explicarian las actividades enzimaticas minimas observadas para la asimilacion de NO3 - en P1 y P6. La minima asimilacion de N que se produce en estos tratamientos se traducira eventualmente en una minima sintesis de los principales compuestos nitrogenados organicos implicados en el crecimiento y desarrollo vegetal. Finalmente, esto conducira a una menor produccion de biomasa y productividad en plantas de frijol ejotero

• Publication year

  2009

• Venue

  Unknown venue

• Publication date

  2009-06-01

• Fields of study

  Not labeled

• Identifiers
  DOI 10.32604/PHYTON.2009.78.011
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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