Interaction of acid exudates in chickpea with biological activity of Bacillus thuringiensis towards Helicoverpa armigera

Devi, V S and Rao, P A and Sharma, S P and Sharma, H C (2014) Interaction of acid exudates in chickpea with biological activity of Bacillus thuringiensis towards Helicoverpa armigera. Journal of Applied Entomology, 138 (4). pp. 289-296. ISSN 1439-0418

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The gram pod borer, Helicoverpa armigera, is one of the most important constraints to chickpea production. High acidity of chickpea exudates is associated with resistance to pod borer, H. armigera; however, acidic exudates in chickpea might influence the biological activity of the bacterium, Bacillus thuringiensis (Bt), applied as a foliar spray or deployed in transgenic plants for controlling H. armigera. Therefore, studies were undertaken to evaluate the biological activity of Bt towards H. armigera on chickpea genotypes with different amounts of organic acids. Significantly lower leaf feeding, larval survival and larval weights were observed on ICC 506EB, followed by C 235, and ICCV 10 across Bt concentrations. Leaf feeding by the larvae and larval survival and weights decreased with an increase in Bt concentration. However, rate of decrease in leaf feeding and larval survival and weights with an increase in Bt concentration was greater on L 550 and ICCV 10 than on the resistant check, ICC 506EB, suggesting that factors in the resistant genotypes, particularly the acid exudates, resulted in lower levels of biological activity of Bt possibly because of antifeedant effects of the acid exudates. Antifeedant effects of acid exudates reduced food consumption and hence might reduce the efficacy of Bt sprays on insect-resistant chickpea genotypes or Bt-transgenic chickpeas, although the combined effect of plant resistance based on organic acids, and Bt had a greater effect on survival and development of H. armigera than Bt alone.

Item Type: Article
Divisions: RP-Grain Legumes
CRP: CGIAR Research Program on Grain Legumes
Uncontrolled Keywords: acid exudates; Bacillus thuringiensis ; biological activity; chickpea; Helicoverpa armigera ; host plant resistance
Subjects: Mandate crops > Chickpea
Others > Entomology
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 03 May 2013 08:42
Last Modified: 23 Oct 2017 05:15
Official URL:
Funders: Government of India - Ministry of Agriculture - Department of Agriculture and Cooperation
Acknowledgement: The authors are thankful to the staff of entomology, ICRISAT for their help in these studies. We thank the Department of Agriculture and Cooperation, Ministry of Agriculture, Government of India, for providing financial support for this project through TMOP/ISOPOM.
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