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Phosphorus nutrition on nitrogen metabolism of non-nodulated soybean

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

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

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

Phyton-International Journal of Experimental Botany 2009, 78(all), 49-52.


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.


Cite This Article

, B., Fioretti, M., Varillas, M., Baioni, S., Mirassón, H. et al. (2009). Phosphorus nutrition on nitrogen metabolism of non-nodulated soybean. Phyton-International Journal of Experimental Botany, 78(all), 49–52.

cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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