Open Access

ARTICLE

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

by Sánchez E, G Ávila-Quezada, AA Gardea, E Muñoz, JM Ruiz, L Romero

1 Centro de Investigación en Alimentación y Desarrollo, A.C. Av. 4ta. Sur 3820, Fracc. Vencedores del Desierto. Cd. Delicias, Chihuahua. México. 33089. Tel.: +52 (639) 4748400. Fax: +52 (639) 4748704.
Address Correspondence to: Esteban Sánchez-Chávez; e-mail: esteban@ciad.mx
2 Departamento de Fisiología Vegetal, Facultad de Ciencias, Universidad de Granada, 18071-Granada, España.

Phyton-International Journal of Experimental Botany 2009, 78(all), 11-16. https://doi.org/10.32604/phyton.2009.78.011

Abstract

The objective of this work was to determine the effect of different P doses on nitrogen assimilation in roots and leaves of green beans plants (Phaseolus vulgaris L. cv. Strike). Phosphorus was applied in the nutrient solution as H₃PO₄, at the nutrient doses of: P1 = 0.40 mM; P2 = 0.80 mM; P3 = 1.60 mM; P4 = 3.20 mM; P5 = 4.80 mM, and P6 = 6.40 mM P. Our results indicate that both P toxicity and deficiency gave similar responses to N assimilation. Phosphorus and NO3 - interacted on the absorption and translocation processes affecting N assimilation. The deficiency (P1), and toxicity (P6) treatments, diminished root absorption of NO₃^- in 15% and 36%, respectively, respect to the optimum dose (P3), thus reducing nutrient availability for assimilation. This result may explain the minimum enzymatic activities observed in NO₃^- assimilation in P1 and P6. The minimum N assimilation observed in these treatments will eventually translate into a minimum synthesis of major N organic compound involved in plant growth and development. This will lead to a reduced plant biomass production and productivity of green beans plants.

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