Department of Bioscience, M.D. University, Rohtak-124001
A concentration dependent decrease in nitrate reductase (E.C.1.6.6.1.) activity in root and leaf by the supply of 0.1 to 2.0 mM Pb(OAC) was noticed in Vigna radiaia (L) Wilczek cv. P-105 seedlings raised for five days under continuous light of 5 K lux at 25± 2°C. Total organic nitrogen content in root and shood increased due to the metal supply whereas organic N content in the cotyledons decreased during the early growth phase. Data show that the enzyme activity was not directly related with the organic nitrogen content in the organs at this stage which was more dependent on the translocation of reserve food meterial from the germinating seeds.
