Abstract
The mode of multiplication of Pseudomonas glumae on/in the rice grains inoculated at booting stage was examined. The total population of P. glumae in the grains at heading time was less than about 107CFU/g fresh weight of grain, but it increased to 108-109CFU/g during 6 days after heading. P. glumae cells densely colonized on the surface of basal part of lodicule and inner surface of lemma were observed under the scanning electron microscope. The bacterial cells invaded into interspaces of host cells of outer epidermis and spongy parenchyma of lemma were also observed in ultra-thin sections of the diseased specimen under the transmission type electron microscope.
