Mk. Ghosh et Rc. Srivastava, EFFECT OF MG, ZN AND MO SALTS ON NITRATE REDUCTASE-ACTIVITY AND SOLUBLE-PROTEIN CONTENT IN LEAVES OF QUERCUS-SERRATA, Biologia plantarum, 36(4), 1994, pp. 599-605
Leaves of Quercus serrata seedlings were sprayed with solutions of dif
ferent concentrations of Mg, Zn and Mo-salts and activity of nitrate r
eductase (NRA) and soluble protein contents were determined in fresh l
eaves of different ages. The optimum dose for magnesium sulphate and z
inc sulphate was 2.5 mM while for ammonium molybdate it was 0.01 mM. U
nder optimum doses of these nutrients high levels of NRA and protein c
ontents were maintained upto 28 d of spray. Observations on NRA were f
urther confirmed by leaf direct treatment and excised shoot-dipping ex
periments which showed maximum NRA at comparatively much lower concent
rations of ions than those used for spray.