The toxic effect of oxygen on the germination and growth of mung bean, caJanand rice seeds during preincubation in oxygen was not relieved or elimnated byCO_2, light or temperature changes. There was a limit to the tolerance of the ger-mination and growth of rice seeds to high oxygen concentration. The growth forrice could recover if they were transferred to normal condition (in air) after thewere treated seeds with oxygen for 1~2 days, but did slowly when treated for 3~4days and eventually lost the ability...