Difference in the Degree of Stomatal Aperture in the Leaves of Rice Mutant Lines and Its Inheritance

Abstract

The degree of stomatal aprture is one of the irnportant characters which control the photosynthetic rate. The degree of stomatal aperture was measured for the rice mutant lines induced from a cultivar Kinmaze by the infiltration method at the adult stage. There was a considerable difference among the mutant lines in the degree of the stomatal aperture of the leaf blades. The degree of stomatal aperture at the young panicle differentiation stage was correlated with that at the heading stage (r=0.65***). The degree of stomal aperture was also correlated with the stomatal conductance (r=0.73***), which was reported to be highly correlated with the photosynthetic rate. A mutant line (CM 1787) which showed the highest score for the stomatal aperture was used for a genetic analysis. A single recessive gene was found to control the high score for stomatal aperture.