Studies on the distribution and remobilization of nitrate in vegetable plants are important theoretical bases for decreasing nitrate content in vegetables and increasing nitrate use efficiency by plants.Hydroponic experiments and plant electro-physiological methods were used to determine tissue nitrate content and vacuolar nitrate activity of different organs of two pakchoi cultivars,which were significantly different in nitrate accumulation.Results obtained were as follows:Vacuolar nitrate activities of le...