Inheritance of Photoperiodic Reaction in Rice

Higher Leaf Area Growth Rate Contributes to Greater Vegetative Growth of F1 Rice Hybrids in the Tropics

“…The close correlation between heterosis in leaf area and heterosis in shoot dry weight at the early growth stage indicated that the vigorous growth of the F 1 hybrids compared with their parental lines, was due to their high leaf area growth rate (LAGR) caused by high tillering (Yamauchi and Yoshida, 1985;Yamauchi, 1994). Earlier reports indicated that hybrids had higher tillering ability than their parental lines Qones, 1924;Sen and Mitra, 1958). The larger leaf area index due to increased number of tillers was the main factor for achieving heterosis in crop growth rate (CGR) of japonica/indica hybrid rice at the early vegetative stage under temperate conditions (Kabaki, 1993).…”