Physiological Studies on the Rooting Ability of Rice Seedling Under Low-Temperature

摘要

It has been already made clear by the authors and other investigators that the rooting ability of upland nursery seedlings of rice plants was higher than that of lowland ones, particularly under low-temperature. We obtained the following results by the further study on this aspect. The water content of upland seedlings after transplanting decreased little in comparison with that of lowland ones. Moreover the ratio of protein N/total N, trichloroacetic acid soluble organic P/total P, the Starch content and the activity of ascorbic acid oxidase were higher in upland seedlings than in lowland ones, especially in the base parts of the seedling. It seemed that there is some correlation between the rooting ability and the activity of ascorbic acid oxidase in the base parts of seedling. From these results it was considered that the rooting ability of nursery seedlings seems to be more responsible for the contents in fhe base parts than the upper parts of the seedling and under low-temperature to be more responsible for the activity to transform those contents to energy than the quantity of contents itself.