VIEW ARTICLE

Physiology and Biochemistry

Examination of Rice Hydathode Water Pores Exposed to Xanthomonas campestris pv. oryzae. A. Guo, Department of Plant Pathology, Throckmorton Hall, Kansas State University, Manhattan 66506; J. E. Leach, Department of Plant Pathology, Throckmorton Hall, Kansas State University, Manhattan 66506. Phytopathology 79:433-436. Accepted for publication 31 October 1988. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/Phyto-79-433.

Compatible and incompatible interactions between Xanthomonas campestris pv. oryzae and the hydathode water pores of rice (Oryza sativa) were studied by scanning electron microscopy. Leaves of the rice cultivars Cas 209 and 1R20, spray-inoculated with isolates of two X. c. oryzae races or water, were sampled for examination by scanning electron microscopy at 24 and 48 hr after inoculation. Individual water pores were examined for the presence or absence of plugging exudate. Water pore plugs were present following all treatments, and no significant differences among treatments were observed in the percentages of pores plugged. Water pores with exudate were also observed in untreated Cas 209 leaf samples. Therefore, plugging of water pores is not specifically induced in incompatible interactions between X. c. oryzae and rice.