Barton-Willis, P. A., Roberts, P. D., Guo, A., and Leach, J. E. 1989. Growth dynamics of Xanthomonas campestris pv. oryzae in leaves of rice differential cultivars. Phytopathology 79:573-578. Bacterial multiplication and spread were monitored in race-specific inter- Symptoms were not observed in advance of bacteria. Lesion lengths, in actions of Xanthomonas campestris pv. oryzae and rice (Oryza sativa). general, were positively correlated with bacterial numbers. When leaves Bacterial numbers in compatible and incompatible interactions increased were inoculated with bacterial mixtures (1:1 of race I or 6 [compatible] to equally until levels reached 107-108 colony-forming units/leaf. Thereafter, race 2 [incompatible]), the growth rate of race 2 isolates was severely the bacterial growth rates in incompatible interactions slowed in restrictedcomparedwiththatofthecontrol(race2alone). Thesameeffects comparison with those in compatible interactions. Maximum bacterial were observed in a host in which all races were compatible. The apparent numbers per leaf were dependent on host cultivar. In both compatible and interaction between bacterial isolates confounded analysis of the effect of incompatible interactions, bacteria spread from the inoculation point; mixed inoculations on race-specific resistance induction. however, bacteria in compatible interactions spread more rapidly.
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