Production of Zinniol byAlternaria tageticaand its Phytotoxic Effect onTagetes erecta

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Abstract
A. tagetica, the causal agent of stem, leaf and flower blight of marigold, is capable of producing phytotoxins in vitro. One of the toxins was identified as zinniol by comparing it with synthetic zinniol in bioassays, TLC and gas chromatography, staining properties, UV and mass spectrometry and NMR spectroscopy. The identity of the other toxin(s) was not established. Symptoms similar to those caused by infection developed on detached marigold leaves treated with either of the toxins or synthetic zinniol. The toxins are not host selective and are capable of causing injury to zinnia, cotton, okra, corn, tomato, watermelon and sunflower.

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