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vigna racines

International Journal of Tropical Insect Science (1)

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A new 6a-hydroxypterocarpan with insect antifeedant and antifungal properties from the roots of Tephrosia hildebrandtii vatke
W. Lwande, A. Hassanali, P. W. Njoroge, M. D. Bentley, F. Delle Monache, J. I. Jondiko
Journal:

Insect Science and Its Application / Volume 6 / Issue 4 / August 1985

Published online by Cambridge University Press:

19 September 2011, pp. 537-541

Print publication:

August 1985
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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.