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Seed infection and field resistance to pseudomonas syringae pv. phaseolicola in seven bean phaseolus vulgaris l. varieties



Seed infection and field resistance to pseudomonas syringae pv. phaseolicola in seven bean phaseolus vulgaris l. varieties



Plant Varieties and Seeds 4(3): 107-114



Seven varieties were exposed to halo blight epidemics, caused by Pseudomonas syringae pv. phaseolicola. Leaf and pod symptoms were scored visually using a scale from 1 to 9. Seeds from each variety were harvested and indexed for P. syringae pv. phaseolicola using immunofluorescence microscopy (IF) and a dilution-plating assay, followed by additional confirmation tests. Generally, the visual assessments of field resistance were consistent throughout the years. Cell counts (expressed as log cells per ml) in IF and plate counts (expressed as log colony-forming units per ml) correlated inversely with scores of symptoms on leaves or pods. IF generally correlated better with scores of symptoms on leaves and pods than dilution-plating results. This was explained by the interference of saprophytes in dilution plating. It was concluded that there is a direct relationship between resistance of a variety to halo blight and seed contamination by P. syringae pv. phaseolicola. When IF is applied in combination with dilution plating a better indication of resistance can be obtained than when using dilution plating only.

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Accession: 007775443

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