Abstract
Leaf dynamics is one of the important characteristics in rice (Oryza sativa L.) because it determines dry matter productivity. Nevertheless, few studies have evaluated the genotypic variation in leaf dynamics. This study conducted one-week-interval nondestructive measurements by using plant canopy analyzer, and parameterized leaf dynamics for a rice diversity research set of germplasm (RDRS) and high yielding varieties. Three year experiment in Kyoto University showed large genotypic variations in 5 indexes of leaf dynamics, which consisted of 4 parameters from the nondestructive measurements (relative growth rate of LAI, the maximum growth rate of light interception, days to 80% coverage and extinction coefficient) and LAI at heading from destructive measurement. The significant differences among genotypic groups were observed in relative growth rate of LAI, the maximum growth rate of light interception, days to 80% coverage. High-yielding varieties released by IRRI had higher values of the maximum growth rate of light interception, suggesting that the varieties have been improved in terms of canopy development. In contrast, since Takanari and Milyang23 didn't have extreme characteristics in leaf dynamics, further improvement may be possible.
