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- Title
Synthesis of the solanapyrone phytotoxins by <em>Ascochyta rabiei</em> in response to metal cations and development of a defined medium for toxin production.
- Authors
Chen, Y. M.; Strange, R. N.
- Abstract
The phytotoxic solanapyrones A, B and C, were produced by Ascochyia rabiei when grown on Czapek Dox nutrients supplemented with an aqueous extract of chickpea seed but not when grown on Czapek Dox nutrients alone. Addition of amino acids, vitamins and inorganic ions to Czapek Dox nutrients allowed the production of the solanapyrones in good yields. By systematic elimination of components of this medium, the constituents essential for toxin production were identified as the divalent metal cations Zn2+, Ca2+, Mn2+ and Cu2+. When these ions were added to Czapek Dox nutrients in the same concentrations as those found in chickpea extract, concentrations of the phslotoxins similar to those found in Czapek Dox nutrients supplemented with chickpea extract were detected. Removal of cations from the chickpea supplement by a cation exchange resin did not affect the growth of the fungus compared with growth on the medium containing the complete supplement, but no toxin was produced. A defined medium and cultural conditions suitable for solanapyrone production by A. rabiei are described.
- Subjects
CHICKPEA diseases &; pests; CHICKPEA ascochyta blight; ASCOCHYTA rabiei; PHYTOTOXINS; PLANT toxins; PLANT diseases
- Publication
Plant Pathology, 1991, Vol 40, Issue 3, p401
- ISSN
0032-0862
- Publication type
Article
- DOI
10.1111/j.1365-3059.1991.tb02397.x