Abstract
Changes in abscisic acid (ABA) levels were determined in leaf tissues of French bean ( Phaseolus vulgaris) inoculated with Uromyces appendiculatus var. appendiculatus (pathogenic) and U. vignae (nonpathogenic) using an indirect enzyme-linked immunosorbent assay (ELISA) and HPLC. There was a significant decrease in abscisic acid levels both in leaf tissues and intercellular washing fluids of rust-infected bean leaves at 6 h post inoculation. Similar decreases were induced by both fungi. ABA levels remained low until at least 48 h after inoculation. No evidence was found for production of ABA by differentiated urediospore germlings of either U. appendiculatus or U. vignae. The results suggest that the decrease in ABA levels is a nonspecific result of changes brought about by infection, prior to cell penetration, and that this growth regulator is not a determinant of successful fungal invasion.
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