Studies on the Pattern of Organ Development in the Rice Plant. : II. Internode Distribution Pattern in Relation of Number to Elongated Internodes.

In the rice varieties of late maturity, the panicle initiation is preceded by the beginning of internode elongation with varying degrees. The internodes which elongate after the panicle initiation increase in length from the lower internodes to the upper ones in a geometrical progression. On the contrary, the length of internodes which elongate before the panicle initiation does not show this trend or regularity and remains rather constant. The internode distribution pattern of the former is indicated by the regression coefficient of logarithmic internode length to the node order and is related to other agronomic traits.