Ultrastructure of Water Pores in Leersia japonica Makino and Oryza sativa L.: its Correlation with the Resistance to Hydathodal Invasion of Xanthomonas campestris pv. oryzae

Abstract

This paper reports the results of transmission and scanning electron microscopical examination of water pore apertures in Leersia japonica and Oryza sativa. Emphasis is placed on the interaction between hydathodal invasion of Xanthomonas campestris pv. oryzae and physical structure of water pore. Electron micrographs revealed that the resistance of L. japonica to the hydathodal invasion was attributed to the morphological feature of outer ledges on the upper side of guard cells. The results suggest that well-developed outer ledges in L. japonica prevent the invasion of the causal bacterium.