Six varieties of rice are treated with heat shock in an experiment which is aimed at measuring both the activity of peroxidase(POD) and the content of malonaldehyde(MDA) in seedling leaves of rice.The relation between POD and rices anti heat ability is studied in this experiment.Results obtained show that,under a high temperature,the activity of POD in seedling leaves of rice rises while the peroxidase isozyme band remains unchanged.The trends of both the increase of the activity of POD and the content of MDA are just opposite to each other.T...