Abscisic Acid in Phytopathogenic Fungi of the Genera Botrytis, Ceratocystis, Fusarium, and Rhizoctonia

Abstract

Strains of the phytopathogenic species Botrytis cinerea, Ceratocystis coerulescens, C.fimbriata, Fusarium oxysporum, and Rhizoctonia solani were cultivated on a de­fined synthetic culture medium. The plant hormone abscisic acid (ABA) was identified by gas chromato- graphy/mass spectrometry and gas chromatography data, and the contents determined in mycelia (15.9-31.9 ng/g mycel) and culture media (1.0-4.6 ng/ml) by scintillation counting.