INTERNODE ELONGATION UNDER DIFFERENT RISING WATER CONDITIONS IN AFRICAN FLOATING RICE (ORYZA-GLABERRIMA STEUD.)

The African and Asian floating rices were grown under different rising water conditions, and internode elongation ability with increasing wa ter depth was measured. In 5 cm/2 day-submerged lot, all varieties hav ing LEI positions at the 8th and 9th internodes could grow until the e nd of the experiment along with the increase of the water depth in bot h species. In these varieties, differences between species in almost g rowth characters were not observed. Among varieties having LEI positio ns from the 10th to 12th internodes, one African and one Asian variety failed to grow. No varieties having LEI position at the 13th internod e could grow, because its average internode length was considerably sh ort. Among varieties with LEI positions from the 8th to 11th internode s in 10 cm/2 day-submerged lot, 4 African varieties and one Asian vari ety did not grow. All varieties with LEI positions from the 12th to 14 th internodes could not grow. From these results, it was suggested tha t under slow rising water conditions, internode elongation ability of both African and Asian floating rices nas almost the same. Under rapid rising water conditions, however, internode elongation in the former was slightly inferior to that in the latter.