Growth Dynamics ofXanthomonas campestrispv.oryzaein Leaves of Rice Differential Cultivars

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Abstract
Bacterial multiplication and spread were monitored in race-specific interactions of Xanthomonas campestris pv. oryzae and rice (Oryza sativa). Bacterial numbers in compatible and incompatible interactions increased equally until levels reached 107-108 colony-forming units/leaf. Thereafter, the bacterial growth rates in incompatible interactions slowed in comparison with those in compatible interactions. Maximum bacterial numbers per leaf were dependent on host cultivar. In both compatible and incompatible interactions, bacteria spread from the inoculation point; however, bacteria in compatible interactions spread more rapidly. Symptoms were not observed in advance of bacteria. Lesions lengths, in general, were positively correlated with bacterial numbers. When leaves were inoculated with bacterial mixtures (1:1 of race 1 or 6 [compatible] to race 2 [incompatible]), the growth rate of race 2 isolates was severely restricted compared with that of the control (race 2 alone). The same effects were obtained in a host in which all races were compatible. The apparent interation between bacterial isolates confounded analysis of the effect of mixed inoculation on race-specific resistance induction.

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