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Impacts of elevated CO 2 on expression of plant defensive compounds in Bt‐transgenic cotton in response to infestation by cotton bollworm
Author(s) -
Wu Gang,
Chen Fa Jun,
Ge Feng,
Xiao NengWen
Publication year - 2011
Publication title -
agricultural and forest entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.755
H-Index - 55
eISSN - 1461-9563
pISSN - 1461-9555
DOI - 10.1111/j.1461-9563.2010.00508.x
Subject(s) - bt cotton , condensed tannin , biology , helicoverpa armigera , infestation , tannin , gossypol , genetically modified crops , agronomy , transgene , horticulture , cry1ac , bollworm , botany , proanthocyanidin , larva , gene , biochemistry , polyphenol , antioxidant
1 The allocation of defensive compounds of transgenic Bt (cv. GK‐12) and nontransgenic cotton (cv. Simian‐3) grown in elevated CO 2 in response to infestation by cotton bollworm Helicoverpa armigera (Hübner) was studied in closed‐dynamics CO 2 chambers. 2 A significant reduction in foliar nitrogen content and Bt toxin protein occurred when transgenic Bt cotton grew under elevated CO 2 . A significantly higher carbon/nitrogen ratio as well as condensed tannin and gossypol contents was observed for transgenic Bt (cv. GK‐12) and nontransgenic cotton in elevated CO 2 , in partial support of the carbon nutrient balance hypothesis as a result of limiting nitrogen and excess carbon in cotton plants in response to elevated CO 2 . 3 The CO 2 level and infestation time significantly affected the foliar nitrogen, condensed tannin, gossypol and Bt toxin protein contents of cotton plants after feeding by H. armigera. The interaction between CO 2 levels × cotton variety had a significant effect on foliar nitrogen content after injury by H. armigera .