Translator Disclaimer
1 August 2000 Plant-Toxin Interactions in Transgenic Bt Cotton and their Effect on Mortality of Helicoverpa armigera (Lepidoptera: Noctuidae)
Author Affiliations +
Abstract

In Australia, transgenic cotton plants expressing the cry1Ac gene from Bacillus thuringiensis Berliner variety kurstaki are less toxic to first-instar Helicoverpa armigera (Hübner) after the plant is producing fruit. We developed two bioassay methods (leaf mush, leaf disk) to test if the physiological state of the plants explained changes in toxicity and a third method (diet incorporation) was developed to quantify the toxicity of Bt leaves when mixed in chickpea diet. Cry1Ac protein was less toxic to H. armigera larvae when the protein was mixed with leaves from fruiting versus presquare conventional cotton. Differences in LC50 varied from 2.4- to 726-fold, depending on the source of toxin and conventional plant material. These results suggest that plant-toxin interactions in fruiting cotton are reducing the toxicity of the Cry1Ac protein. The possible role of tannins in these changes is discussed.

K. M. Olsen and J. C. Daly "Plant-Toxin Interactions in Transgenic Bt Cotton and their Effect on Mortality of Helicoverpa armigera (Lepidoptera: Noctuidae)," Journal of Economic Entomology 93(4), 1293-1299, (1 August 2000). https://doi.org/10.1603/0022-0493-93.4.1293
Received: 24 February 1999; Accepted: 1 January 2000; Published: 1 August 2000
JOURNAL ARTICLE
7 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top