Journal of General Plant Pathology

, Volume 67, Issue 1, pp 51–57

Growth Complementation of hrpXo Mutants of Xanthomonas oryzae pv. oryzae by Virulent Strains in Rice Cultivars Resistant and Susceptible to the Parental Strain

Authors

  • Seiji TSUGE
    • Faculty of Agriculture, Kyoto Prefectural University, Kyoto 606–8522, Japan
  • Ayako FURUTANI
    • Faculty of Agriculture, Kyoto Prefectural University, Kyoto 606–8522, Japan
  • Rie FUKUNAKA
    • Faculty of Agriculture, Kyoto Prefectural University, Kyoto 606–8522, Japan
  • Yasuyuki KUBO
    • Faculty of Agriculture, Kyoto Prefectural University, Kyoto 606–8522, Japan
  • Osamu HORINO
    • Faculty of Agriculture, Kyoto Prefectural University, Kyoto 606–8522, Japan

DOI: 10.1007/PL00012987

Cite this article as:
TSUGE, S., FURUTANI, A., FUKUNAKA, R. et al. J Gen Plant Pathol (2001) 67: 51. doi:10.1007/PL00012987

Xanthomonas oryzae

pv. oryzae (X. o. pv. oryzae) T7174 is virulent on rice cultivar IR24 and avirulent on IR-BB2. From recent reports, some virulence and avirulence factors of plant pathogenic bacteria are transferred to plant cells through the hrp-dependent type III secretion system. In this study, we investigated the involvement of hrp genes in the compatible and the incompatible interactions between rice and X. o. pv. oryzae after co-inoculation with hrpXo mutants derived from T7174 and virulent strains. Growth of the mutants, named 74ΔHrpXo and 76ΔHrpXo, was repressed in IR24 when the mutants were applied alone. However, growth of the mutants was complemented by co-inoculation with virulent strains. Growth of bioluminescent hrpXo mutant 76ΔHrpXo in IR24 and its growth in IR-BB2 after co-inoculation with T7133, which is virulent on both cultivars, was equally complemented, as detected by bioluminescence from the mutant. On the other hand, only partial complementation of growth of T7174L76, which is a bioluminescent and pathogenic derivative of T7174, by T7133 was observed in IR-BB2. Thus, growth of the hrpXo mutant of X. o. pv. oryzae was complemented by virulent strains in both susceptible and resistant rice leaves with the parental strain.

Key words : Xanthomonas oryzae pv. oryzae, bacterial leaf blight, hrpXo, co-inoculation, bioluminescence.

Copyright information

© The Phytopathological Society of Japan 2001