TY  - EJOU
AU  - Brevedan, 
AU  - Fioretti, MN 
AU  - Varillas, MA 
AU  - Baioni, SS 
AU  - Mirassón, HR 
AU  - Palomo, IR 

TI  - Phosphorus nutrition on nitrogen metabolism of non-nodulated soybean
T2  - Phyton-International Journal of Experimental Botany

PY  - 2009
VL  - 78
IS  - all
SN  - 1851-5657

AB  - 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.
KW  - phosphorus deficiency
KW  -  nitrate reductase
KW  -  nitrate uptake
KW  -  nitrate translocation
KW  -  phosphorus-nitrogen interactions

DO  - 10.32604/phyton.2009.78.049