Photosynthetic Capacity and Inheritance of V-type Leaf in Rice (Oryza sativa L.)

Abstract

The rice lines with leaves forming an angle at the midrib toward the adaxial surface (V-type leaves) were selected from the descendants of a cross between Milyang 23 and an off-spring of a cross between a Javanica cultivar, Arborio and a Japonica mutant, Daikoku 1. The photosynthetic rates of the V-type leaves on a projected leaf area basls were significantly higher than those of the ancestor and parent in the irradiance range over 160 Wm-2, but the photosynthetlc rates of the V-type leaves on an unfolcled leaf area basis were almost the same as those of the ancestor and parent at all the irradiance levels. Nitrogen content of the V-type leaves on an unfolded leaf area basis ancl leaf thickness did not differ appreciablly from the corresponding values in the ancestor and parent although there were significant differences in some cases. The V-type leaf character was found to be regulated by a single recessive gene.