Abstract
Morphological changes of the rice plant under and after submersion were studied in relation to the lodging resistance of the rice plant. Results are summarized as follows. 1. Leaf blade and leaf sheath of young plant grown under submersion elongated remarkably and wilted due to strong dehydration after recession of water. 2. Submersion inhibited tillering at basal portion of rice plant and sometimes increased number of nodes in main culm. 3. The internode near the ground elongated abnormally under submersion, and the lodging resistance of rice plant was reduced. 4. Submersion after booting stage stimulated the growth of highernodal tillers and unbalanced growth stratum of rice plant. 5. Submersion at each stage accelerated aging of organs at the lower part and inhibited the development of subterranean part of the rice plant.
