New 6a-hydroxypterocarpan with insect antifeedant and antifungal properties from the roots of Tephrosia hildebrandtii vatke
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Date
2011-09-19
Authors
Hassanali, Ahmed
Lwande, W.
Njoroge, P. W.
Bentley, M. D.
Monache, F. D.
Jondiko, J. I.
Journal Title
Journal ISSN
Volume Title
Publisher
International Journal of Tropical Insect Science
Abstract
A new 6a-hydroxylated pterocarpan, named hildecarpin, has been isolated from the healthy roots of Tephrosia hildebrandtii. It has been assigned the structure (−)-3, 6a-dihydroxy-2-methoxy-8, 9-methylenedioxypterocarpan on the basis of its spectroscopie data, optical rotation and chemical transformations. Hildecarpin has exhibited insect antifeedant activity against the legume pod-borer Maruca testulalis, an important pest of the cowpea (Vigna unguiculata), and antifungal activity against Cladosporium cucumerinum. This finding suggests that the pterocarpan phytoalexins formed as a result of microbial infection of the cowpea plant may constitute a basis for induced resistance in the plant against M. testulalis.
Description
DOI: http://dx.doi.org/10.1017/S1742758400004379
Keywords
Tephrosia hildebrandtii, Leguminosae, pterocarpan, hildecarpin, flavonoid, isoflavonoid, antifeedant, antifungal, Maruca testulalis, cowpea, Vigna unguiculata, Vigna species, roots
Citation
International Journal of Tropical Insect Science / Volume 6 / Issue 04 / August 1985, pp 537-541