Record Details

Influence of transgenic cottons with Bacillus thuringiensis cry1Ac gene on the natural enemies of Helicoverpa armigera

OAR@ICRISAT

View Archive Info
 
 
Field Value
 
Relation http://oar.icrisat.org/834/
http://dx.doi.org/10.1007/s10526-006-9032-6
 
Title Influence of transgenic cottons with Bacillus thuringiensis cry1Ac gene on the natural enemies of Helicoverpa armigera
 
Creator Sharma, H C
Arora, R
Pampapathy, G
 
Subject Agriculture-Farming, Production, Technology, Economics
 
Description Transgenic cotton has been released for cultivation in several parts of the world to increase crop productivity. However, concerns have been raised regarding the possible undesirable effects of genetically modified crops on non-target organisms in the eco-system. Therefore, we studied the effects of transgenic cottons with cry1Ac gene from Bacillus thuringiensis Berliner (Bt) on the natural enemies of cotton bollworm/legume pod borer, Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) under field and laboratory conditions. There was no apparent effect of transgenic cotton on the relative abundance of predatory spiders (Clubiona sp. and Neoscona sp.), coccinellid (Cheilomenes sexmaculatus Fab.), and the chrysopid (Chrysoperla carnea Stephens). However, the abundance of spiders, coccinellids, and chrysopids was quite low in insecticide protected plots towards end of the cropping season. There was a significant reduction in cocoon formation and adult emergence of the ichneumonid parasitoid, Campoletis chlorideae Uchnida reared on H. armigera larvae fed on the leaves of transgenic cottons before and after parasitization. However, no Bt toxins were detected in H. armigera larvae and the parasitoid cocoons with enzyme linked immunosorbent assay. Reduction in cocoon formation was because of early mortality of the H. armigera larvae due to Bt toxins in the leaves of transgenic cotton. There was a slight reduction in adult weight and fecundity, and prolongation of the larval period when the parasitoid was raised on H. armigera larvae fed on the leaves of transgenic cotton before and after parasitization. Survival and development of C. chlorideae was also poor when H. armigera larvae were fed on the leaves of cotton hybrid Mech 184. The adverse effects of transgenic cotton on survival and development of C. chlorideae were largely due to early mortality, and possibly poor nutritional quality of H. armigera larvae due to toxic effects of the transgene.
 
Date 2007
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/834/1/BioControl_52_469%E2%80%93489_2007.pdf
Sharma, H C and Arora, R and Pampapathy, G (2007) Influence of transgenic cottons with Bacillus thuringiensis cry1Ac gene on the natural enemies of Helicoverpa armigera. BioControl, 52. pp. 469-489.