Effect of seedling age and submergence on nitrate reductase and a amylase activity in rice

摘要

A study was undertaken to study the response of submergence duration and age of the seedlings on enzyme activity like nitrate reductase and a-amylase. Leaf nitrate reductase activity of submergence tolerant rice genotypes like FR-13 A and TCA-85 was significantly higher than that of susceptible Pankaj and Mahsuri. Nitrate reductase activity declined under submergence in both tolerant and susceptible genotypes. A positive correlation was found between the nitrate reductase activity and survival (r~2=0.74), which may be utilized as criteria ofselecting the submergence tolerant genotypes for improving rainfed lowland rice growing ecosystem. Varieties with higher reductase activity had higher survival rate under submergence while a-amylase activity decreased under submergence. Maximum reduction in a-amylase activity was recorded in treatment with 11 days submergence.