Growth phase dependent resistance to oxidative stress in a phytopathogen Xanthomonas oryzae pv. oryzae

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Abstract
Xanthomonas oryzae pv. oryzae, a rice bacterial pathogen, showed growth phase dependent resistance to oxidative stress killing. Stationary phase cells were much more resistant to killing concentrations of H2O2, organic peroxides, and a superoxide generator (menadione) than cells from early log and mid-log phases. The stationary phase stress resistance phenotype did not require de novo protein synthesis. Also, nutrient starvation or media metabolites were not inducing signals for the phenotype. The stationary phase stress resistance did not apply to all types of stress. For example, X. oryzae pv. oryzae was equally sensitive to heat and pH 5.5 stress at all growth phases tested. This pattern of stationary phase resistance to stress differs from observations in other bacteria and could be important in plant–microbe interactions.Key words: phytopathogen, stationary growth phase, resistance to oxidative stress killing.

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