אסיף מאגר המחקר החקלאי

Triphenyl derivatives of group IV elements as inhibitors of growth and digestive enzymes of Tribolium castaneum larvae

Year:

1977

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Volume :

7

Co-Authors:

Ishaaya, I., Division of Entomology, ARO, The Volcani Center, Bet Dagan, Israel
Holmstead, R.L., Department of Entomological Sciences, University of California, Berkeley, CA 94720, United States
Casida, J.E., Department of Entomological Sciences, University of California, Berkeley, CA 94720, United States

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Abstract:

The potency of triphenyl derivatives of group IV elements in inhibiting the growth of first and fourth instar Tribolium castaneum larvae is much greater for Ph3SnCl and Ph3PbCl than for Ph3GeCl, Ph3SiOH, and Ph3CCl. Pupated larvae emerge normally, showing that the pupal stage is not affected. The larval growth retardation may result from an antifeeding effect involving digestive enzyme inhibition. Ph3SnCl and Ph3PbCl at 500 μmol/kg of diet completely inhibit larval growth (fourth instar larvae) and provide a reduction of 56-59, 29-33, and 2-15% in the in vivo activity of invertase, amylase, and protease, respectively. Under these conditions Ph3GeCl, Ph3SiOH, and Ph3CCl are essentially inactive. High concentrations (5 × 10-4 and 2 × 10-3 M) of Ph3SnCl and Ph3GeCl acting in vitro strongly inhibit invertase, amylase, and protease activities, whereas Ph3PbCl is moderately inhibitory and Ph3SiOH and Ph3CCl are inactive. When both in vivo and in vitro findings are considered, Ph3SnCl is the most potent inhibitor of larval digestive enzymes. © 1977.

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