Journal of Food, Agriculture and Environment

Comparative influence of root wounds on proliferation of Ralstonia solanacearum and bacterial wilt disease in plant species with varying resistances

Author(s):

Taro Mori ^1*, Tomohiro Fujiyoshi ¹, Hiromi Matsusaki ², Katsumi Ozaki ³, Naotaka Matsuzoe ²

Recieved Date: 2011-01-18, Accepted Date: 2011-03-22

Abstract:

Ralstonia solanacearum is a soilborne pathogen that causes bacterial wilt in numerous plant species worldwide. In this study, the influence of root wounds on proliferation of R. solanacearum and bacterial wilt disease was investigated in four plant species with varying resistances. Host and susceptible eggplant, host and tolerant Solanum toxicarium, non-host and immune maize, and cucumber, which has not been reported as being susceptible to bacterial wilt, were grown in aseptic culture that did not receive the root wounds by biotic factors. These plants were inoculated with R. solanacearum into wounded or unwounded sites. In eggplant and S. toxicarium, though wounded-inoculated seedlings did not suppress bacterial proliferation and showed symptoms, almost unwounded-inoculated seedlings controlled low bacterial density and did not have any symptoms. It was clear that root wounds influenced bacterial proliferation and the progress of plant disease. This result suggests that unwounded plants express induced resistance during the period from the invasion of the intercellular spaces of roots to the infestation of the xylem vessels, thus proliferation of the pathogen is suppressed, and plants do not wilt. By contrast, in maize and cucumber, both wounded and unwounded-inoculated seedlings suppressed bacterial proliferation and did not show any symptoms. It was proved that cucumber has strong resistance to bacterial wilt. Furthermore, it was clear that root wounds did not influence bacterial proliferation and plant disease in maize and cucumber. This result may be due to the high constitutive resistance or early induced resistance before the pathogen reached high densities in xylem vessels.

Keywords:

Ralstonia solanacearum, root wounds, resistance, aseptic culture

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Journal: Journal of Food, Agriculture and Environment
Year: 2011
Volume: 9
Issue: 2
Category: Environment
Pages: 641-645

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