Relationships between nitrate level, nitrate reductase activity and anaerobic nitrite production inPisum sativum leaf tissue

Abstract
Anaerobic nitrite production (thein vivo NO3-R activity) in an incubation medium lacking exogenous nitrate but containing 0.5%n-propanol and 0.1% Triton X-100 showed higher correlation (y - ax b) with the level of endogenous nitrate inPisum sativum L. leaves than thein vitro nitrate reductase activity. Thein vivo NO3-R activity correlated well with thein vitro activity up to the 50 ppm NO3-N level of endogenous nitrate. The ratioin vivo: in vitro activity slightly decreased with increasing level of endogenous nitrate in leaf tissue.