Open Access

ARTICLE

Phosphorus nutrition on nitrogen metabolism of non-nodulated soybean

Brevedan¹ RE, MI Aveldaño², MN Fioretti¹, MA Varillas², SS Baioni¹, HR Mirassón³, IR Palomo¹

1 Departamento de Agronomía, Universidad Nacional del Sur y CERZOS, CONICET. 8000 Bahía Blanca, Argentina.
2 Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur. 8000 Bahía Blanca, Argentina.
3 Facultad de Agronomía, Universidad Nacional de La Pampa, 6300 Santa Rosa, Argentina.

* Corresponding Author: Address Correspondence to: Dr. Roberto E Brevedan,

Phyton-International Journal of Experimental Botany 2009, 78(all), 49-52. https://doi.org/10.32604/phyton.2009.78.049

Abstract

Two experiments were conducted under greenhouse conditions to study the influence of P deficiency on nitrogen nutrition of non-nodulated soybean. There was a reduction of N and P content in P deficient (P-) plants of almost 50% after 50 days. During this period, dry matter of these plants was reduced by 33%. Nitrate reductase activity and shoot nitrate content were lower in Pthan in P+ plants. Seventy five percent of nitrates in P- plants were in the roots. Nitrate accumulation in roots would be due to the lower nitrate reductase activity in this organ and a reduced water flux to shoots. Root nitrate concentration increases would cause a negative feedback which would reduce plant nitrate uptake.

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Keywords

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