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First observation of linkage between genes controlling resistance found in crop pests
January 30, 2002Researchers at Clemson University, USA have found connections between resistance controlling genes in Heliothis virescens F (Tobacco budworm), a serious pest of cotton. `This linkage may contribute to the rapid evolution of resistance observed in this pest` said researcher Thomas M Brown.
New evidence published in the January issue of the SCI journal Pest Management Science shows for the first time that the genes controlling detoxification and sodium channel insensitivity are linked in this crop pest, known to offer high levels of resistance.
Tobacco budworm is one of the key pests targeted by both conventional insecticides, to which it has evolved resistance to all major classes, and transgenic cotton technology, for which potential resistance is a crucial issue.
In Heliothis virescens F, reduced sensitivity of the sodium ion channel, the target of pyrethroids and DDT, has been associated with resistance. The researchers from Clemson University have shown that there is a genetic linkage of the hscp (heliothis sodium channel protein) gene that encodes the sodium channel target and cytochrome P450 (CYP6B10), a gene that encodes important enzymes involved in the detoxification of various pesticides. According to Brown "this paper provides clear proof that genes hscp and CYP6B10 are linked, and this linkage may contribute to the rapid evolution of resistance observed in this pest."
"Linkage of two known resistance factors suggests the possibility of a resistance cassette in this species, which if present, could have serious implications for management of this pest," said Brown. These observations are also likely to apply to other noctuid pests including Helicoverpa zea (corn earworm) and Helicoverpa armigera (a cotton pest throughout Asia).
John Wiley & Sons
In Heliothis virescens F, reduced sensitivity of the sodium ion channel, the target of pyrethroids and DDT, has been associated with resistance. The researchers from Clemson University have shown that there is a genetic linkage of the hscp (heliothis sodium channel protein) gene that encodes the sodium channel target and cytochrome P450 (CYP6B10), a gene that encodes important enzymes involved in the detoxification of various pesticides. According to Brown "this paper provides clear proof that genes hscp and CYP6B10 are linked, and this linkage may contribute to the rapid evolution of resistance observed in this pest."
"Linkage of two known resistance factors suggests the possibility of a resistance cassette in this species, which if present, could have serious implications for management of this pest," said Brown. These observations are also likely to apply to other noctuid pests including Helicoverpa zea (corn earworm) and Helicoverpa armigera (a cotton pest throughout Asia).
John Wiley & Sons
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