Abstract
Two phytoalexins accumulated in onion bulb scales in response to inoculation with Botrytis cinerea, a non-pathogen of onions. These compounds, termed tsibulins (1d and 2d) after the Ukrainian word tsibulya for onion, were isolated by gel filtration, TLC and HPLC, and identified by spectroscopic methods as 1,3-dion-5-octyl-cyclopentane (tsibulin 1d) and 1,3-dion-5-hexyl-cyclopentane (tsibulin 2d). The two phytoalexins accumulated in limited lesions (resistant reaction) in plant tissue in response to inoculation with B. cinerea at the same time as the growth of infection hyphae was restricted within the lesions, reaching 300–400 μg g −1 dry wt of tissue. They did not accumulate in spreading lesions in onion bulb scales in response to inoculation (susceptible reaction). This is the first report of such compounds with phytoalexin activity from onion.
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