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A field study was carried out to quantify plant growth and the foliar chemistry of transgenic Bacillus thuringiensis(Bt)cotton(cv.GK-12)exposed to ambient CO_2 and elevated(double-ambient)CO_2 for different lengths of time(1,2 and3 months)in 2004 and 2005.The results indicated that CO_2 levels significantly affected plant height,leaf area per plantand leaf chemistry of transgenic Bt cotton.Significantly,higher plant height and leaf area per plant were observed aftercotton plants that were grown in elevated CO_2 were compared with plants grown in ambient CO_2 for 1,2 and 3 months inthe investigation.Simultaneously,significant interaction between CO_2 level×investigating year was observed in leaf areaper plant.Moreover,foliar total amino acids were increased by 14%,13%,11% and 12%,14%,10% in transgenic Bt cottonafter exposed to elevated CO_2 for 1,2 or 3 months compared with ambient CO_2 in 2004 and 2005,respectively.Condensedtannin occurrence increased by 17%,11%,9% in 2004 and 12%,11%,9% in 2005 in transgenic Bt cotton after being exposedto elevated CO_2 for 1,2 or 3 months compared with ambient CO_2 for the same time.However,Bt toxin decreased by 3.0%,2.9%,3.1% and 2.4%,2.5%,2.9% in transgenic Bt cotton after exposed to elevated CO_2 for 1,2 or 3 months comparedwith ambient CO_2 for same time in 2004 and 2005,respectively.Furthermore,there was prominent interaction on the foliartotal amino acids between the CO_2 level and the time of cotton plant being exposed to elevated CO_2.It is presumed thatelevated CO_2 can alter the plant growth and hence ultimately the phenotype allocation to foliar chemistical components oftransgenic Bt cotton,which may in turn,affect the plant-herbivore interactions.
A field study was carried out to quantify plant growth and the foliar chemistry of transgenic Bacillus thuringiensis (Bt) cotton (cv.GK-12) exposed to ambient CO_2 and elevated (double-ambient) CO_2 for different lengths of time and3 months) in 2004 and 2005.The results indicated that CO_2 levels significantly affected plant height, leaf area per plant and leaf chemistry of transgenic Bt cotton .Significantly, higher plant height and leaf area per plant were observed aftercotton plants that were grown in elevated CO_2 were compared with plants grown in ambient CO_2 for 1, 2 and 3 months inthe investigation. Simultaneously, significant interaction between CO 2 level × investigating year was observed in leaf area plant plant. Moreover, foliar total amino acids were increased by 14%, 13% 11% and 12%, 14%, 10% in transgenic Bt cottonafter exposed to elevated CO_2 for 1, 2 or 3 months compared with ambient CO_2 in 2004 and 2005, respectively. Condensed tannin increased increased by 17%, 11%, 9% in 2004 and 12%, 11% , 9% in 2005 in transgenic Bt cotton after being exposed to elevated CO_2 for 1,2 or 3 months compared with ambient CO_2 for the same time. However, Bt toxin decreased by 3.0%, 2.9%, 3.1% and 2.4%, 2.5% , 2.9% in transgenic Bt cotton after exposed to elevated CO_2 for 1, 2 or 3 months compared with ambient CO_2 for same time in 2004 and 2005, respectively. Still more, there was prominent interaction on the foliartotal amino acids between the CO_2 level and the time of cotton plant being exposed to elevated CO_2.It is presumed thatelevated CO_2 can alter the plant growth and caused ultimately nec the phenotype allocation to foliar chemistical components of transgenic bt cotton, which may in turn, affect the plant-herbivore interactions.