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Modes of action of fraxinellone against the tobacco budworm, Heliothis virescens
Author(s) -
Liu Zhi Long,
Ho Shuit Hung,
Goh Swee Hock
Publication year - 2009
Publication title -
insect science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 45
eISSN - 1744-7917
pISSN - 1672-9609
DOI - 10.1111/j.1744-7917.2009.00266.x
Subject(s) - heliothis virescens , biology , proteases , midgut , heliothis , amylase , larva , food science , toxicology , botany , biochemistry , enzyme , noctuidae
Fraxinellone significantly reduced the relative growth rate, food consumption rate as well as the efficiency of conversion of ingested food into biomass of Heliothis virescens when incorporated into artificial diets at concentrations of 4.31 × 10 −5 mol/L and above. After being fed with fraxinellone‐treated diets for 24 h, the larval midguts of H. virescens possess significantly lower activities of α‐amylase and non‐specific proteases and higher activities of cytochrome P450s. In vitro , the compound did not inhibit the activities of α‐amylase and non‐specific proteases extracted from the larval midguts. Clear evidence of post‐ingestive toxicity of fraxinellone to midgut cells was observed under an electron microscope. The modes of action of the compound against insects were discussed.