Resistance ofPhaseolusLine WBR 133 toPseudomonas syringae

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Abstract
Phaseolus line WBR 133 has a high degree of resistance to P. syringae, causal agent of bacterial brown spot of bean [Phaseolus vulgaris]. Histologic leaf imprint, diffusive resistance porometric and scanning electron microscopic studies showed no differences between WBR 133 and ''Tenderwhite'', a susceptible cultivar, that would affect penetration of the bacteria into the leaf. In vivo multiplication of the pathogen showed large differences between the 2 hosts. Bacteria multiplied exponentially in the susceptible host to reach a final concentration of about 5 .times. 106 cells/cm2 of leaf, compared with 5 .times. 104 cells in resistant plants. Resistance was decreased by high temperature, high light intensity and short day length.

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