Electric potential transmission (EPT) is proved widely in higher plants.Many investigations are involved recently in exploring the physiological role of EPT.However,a few of researches are related to biochemical bases of long-distance EPT up to now.Since the 1980s,reports concerning mechanism of EPT in higher plants have increased gradually.Ren et al.found that living cells were necessary for EPT. Electric potential transmission (EPT) is found widely in higher plants. Many investigations are involved recently in exploring the physiological role of EPT. However, a few of researches are related to biochemical bases of long-distance EPT up to now. Since the 1980s, reports concerning mechanism of EPT in higher plants have increased gradually. Ren et al. found that living cells were necessary for EPT.