Studies on structure-activity relationship of sphaeropsidins A-F, phytotoxins produced by Sphaeropsis sapinea f. sp. cupressi |
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Authors: | Sparapano Lorenzo Bruno Giovanni Fierro Olga Evidente Antonio |
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Institution: | Dipartimento di Biologia e Patologia Vegetale, Università di Bari, I-70126, Bari, Italy. sparlor@agr.uniba.it |
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Abstract: | Six forms of sphaeropsidins (SA-SF), three- and tetra-cyclic unrearranged pimarane diterpenes produced by Sphaeropsis sapinea f. sp. cupressi, as well as eight derivatives obtained by chemical modification of SA-SC, were assayed for their bioactivity. The effect of each compound on plants which are host or non-host of the pathogen was investigated. Activity on some plant pathogenic fungi was also tested. Some structure-activity relationships have been identified for both phytotoxic and antifungal activity. It appears that the integrity of the tricyclic pimarane system, the preservation of the double bond C(8)-C(14), the tertiary hydroxyl group at C-9, the vinyl group at C-13, and the carboxylic group at C-10 as well as the integrity of the A-ring provide these molecules with non selective phytotoxic and antimycotic activity. |
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Keywords: | Cypress Cupressaceae Sphaeropsis sapinea f sp cupressi Cypress canker disease Pimarane diterpene Sphaeropsidin derivatives Structure-activity relationship |
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