Botrytis cinerea, a phytopathogenic fungus causing serious gray mold disease of many kinds of cultivated plants, produces a plant growth inhibitory substance. The active substance was isolated and identified as abscisic acid (ABA), a wellknown plant hormone. This report described a microbial production of ABA, emphasizing that ABAproduction by this fungus was remarkably enahnced by irradiating the fungus with blue light during the culture.
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Marumo et al. (1982) studied this question.