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The floating habit of 10 strains belonging to Oryza sativa, O. perennis or O. glaberrima was studied by sinking them up to 3m deep in water at 6 different rates, namely, 0 (control), 1.5, 3.1, 4.6, 6.2 and 9.3cm per day. Number of days of floating, plant height, leaf length, total internode length, number of internodes and average internode length were observed.From this experiment the following results were obtained.(1) The 10 examined strains can be classified into 3 groups regarding thefloating habit. Strains 1 and 2 of O. sativa and strain 5 of O. perennis were pronouncedly floating, strains 6 and 7 of O. perennis and strain 8 of O. glaberrima were weakly floating, and strains 3 and 4 of O. sativa and strains 9 and 10 of O. glaberrima were non-floating.(2) In the pronounced floaters the increase in plant height under flood conditions is almost entirely dependent upon the increase of the total internode length but little upon length of a floating leaf. Effect of the latter is, however, rather important in the weak floaters.(3) The increase in total internode length is almost equally dependent upon the increase in the number of internodes and their elongation.(4) Internode length of floating rice types collected in their native places was extremely variable, while that of the experimentally raised plants was uniform. Length of almost all internodes of the collected plants falls within the range of the average internode lengths of the experimental plants raised in the control and a high sinking rate-plot.(5) Rate of internode elongation increases, within a limit, proportionally with sinking rates. Floating habit of individual strains can be characterized by 3 factors, a, b and c, which determine a regression of the rate of internode elongation on the sinking rate. Factor a, indicating the rate of internode elongation achieved under normal conditions, can be used as an index of resistance against a sudden flood. Factor b represents the slope of the regression line and indicates the capacity of a strain to elongate the internodes in correspondence to water raise. The third factor c represents the maximum rate of elongation.(6) Analysis of those 3 factors is a useful means to characterize the floating habit of individual strains. Among the 3 pronounced floaters, strain 1 has an extremely large a and the smallest b, being most resistant against a rapid sinking for a short period. Strain 2 is characterized by the smallest a and c and a much larger b than that of strain 1. Strain 5 has the largest b and c and is most resistant to a chronic flood condition. All 3 weak floaters have only small a and c but their b's are almost comparable to those of the pronounced floaters.

Floating Habit of 10 Strains of Wild and Cultivated Rice