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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

APA Style
RE, B., Aveldaño, M., Fioretti, M., Varillas, M., Baioni, S. et al. (2009). Phosphorus nutrition on nitrogen metabolism of non-nodulated soybean. Phyton-International Journal of Experimental Botany, 78(all), 49-52.
Vancouver Style
RE B, Aveldaño M, Fioretti M, Varillas M, Baioni S, Mirassón H, et al. Phosphorus nutrition on nitrogen metabolism of non-nodulated soybean. Phyton-Int J Exp Bot. 2009;78(all):49-52
IEEE Style
B. RE et al., "Phosphorus nutrition on nitrogen metabolism of non-nodulated soybean," Phyton-Int. J. Exp. Bot., vol. 78, no. all, pp. 49-52. 2009.

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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