Abstract
Allocation of allomones of transgenic Bacillus thuringiensis Gossypium hirsutum (Bt cotton) (cv. GK-12) and non-Bt-transgenic cotton (cv. Simian-3) grown in elevated CO2 in response to infestation by cotton aphid, Aphis gossypii Glover, was studied in a closed-dynamics CO2 chamber. Significant increases in foliar condensed tannin and carbon/nitrogen ratio for GK-12 and Simian-3 were observed in elevated CO2 relative to ambient CO2, as partially supported by the carbon nutrient balance hypothesis, owing to limiting nitrogen and excess carbon in cotton plants in response to elevated CO2. The CO2 level significantly influenced the foliar nutrients and allomones in the cotton plants. Aphid infestation significantly affected foliar nitrogen and allomone compounds in the cotton plants. Allomone allocation patterns in transgenic Bt cotton infested by A. gossypii may have broader implications across a range of plant and herbivorous insects as CO2 continues to rise.
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Acknowledgements
We thank Professor Marvin Harris from Texas A&M University for reviewing our manuscript draft. This project was supported by “National Basic Research Program of China” (973 Program) (No. 2006CB102002), the Innovation Program of Chinese Academy of Science (KSCX2-YW-N-006) and National Nature Science Fund of China (No. 30571253, 30621003).
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Gang Wu and Fa Jun Chen contributed equally to this work.
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Wu, G., Chen, F.J., Ge, F. et al. Transgenic Bacillus thuringiensis (Bt) cotton (Gossypium hirsutum) allomone response to cotton aphid, Aphis gossypii, in a closed-dynamics CO2 chamber (CDCC). J Plant Res 120, 679–685 (2007). https://doi.org/10.1007/s10265-007-0110-3
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DOI: https://doi.org/10.1007/s10265-007-0110-3