Interactions of Elevated Co<sub>2</sub>and Nitrogen Fertilization: Effects on Production of<i>Bacillus thuringiensis</i>Toxins in Transgenic Plants

Coviella, Carlos E.; Morgan, David; Trumble, John T.

doi:10.1603/0046-225x-29.4.781

Cited by 40 publications

(35 citation statements)

References 31 publications

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“…In the current study, there was a general decrease in % C and no defined trend in change of % N and C:N ratio in all treatments. This result is in agreement with Coviella et al (2000) who reported an undefined trend in the change of N content in Bt and non-Bt cotton. On the other hand, Lachnicht (2004) reported a decrease in % C as Bt cotton litter decomposed while % N remained unchanged; this was also observed by Donegan et al (1997).…”

Section: Discussionsupporting

confidence: 93%

Nematode diversity in soil from a field trial with decomposing Bt cotton expressing Cry1Ac and Cry2Ab2 protein

Karuri

Amata

Amugune

et al. 2013

Span. j. agric. res.

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The quality of decomposing plant materials may affect the soil community structure. The aim of the study was to determine the impact of decomposing Bt cotton and its isoline on soil nematode diversity. Bt cotton (06Z604D), isoline (99M03) and HART 89M (local non-Bt cotton cultivar) were planted for two seasons in a completely randomized block design in a confined field trial at Mwea, Kenya. After harvest the plant material was incorporated into soil and the nematode diversity was determined. The presence of Bt protein was evaluated using ELISA and insect bioassays. Abundance of bacteria feeding nematodes was significantly (p < 0.05) high but to a smaller extent in the Bt cotton plots (53.7% and 52% in the first and second season respectively) than in isoline (42.8% and 45% in the first and second season respectively). Insect bioassays detected Bt protein in the Bt cotton plots during the entire decomposition period in both seasons. There were no significant differences in nematode trophic groups composition between isoline and HART 89M. The effect of Cry2Ab2 and Cry1Ac protein in decomposing Bt cotton litter on soil nematodes was minimal. The study provides a basis for future studies on the impact of genetically engineered plants on soil nematodes in Kenyan agroecosystems.

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Section: Discussionsupporting

confidence: 93%

Nematode diversity in soil from a field trial with decomposing Bt cotton expressing Cry1Ac and Cry2Ab2 protein

Karuri

Amata

Amugune

et al. 2013

Span. j. agric. res.

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“…Finally, there was no apparent difference in chemical composition between Bt and non-Bt cotton. Coviella et al (2000) showed no significant differences in N content of Bt cotton from that of non-Bt cotton. Lachnicht et al (2004) found that there was no substantial difference in nutrient content of the materials between Bt cotton and non-Bt cotton.…”

Section: Discussionmentioning

confidence: 77%

Bt cotton planting does not affect the community characteristics of rhizosphere soil nematodes

Yang

Chen

Liu

et al. 2014

Applied Soil Ecology

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“…Elevated CO 2 typically increases plant biomass and net photosynthesis (Poorter et al 1997), whereas O 3 is a stress factor that decreases photosynthesis rates, and leads to the formation of reactive oxygen species in the plant leaf apoplast (Fiscus et al 2005;Kangasjärvi et al 2005). The eVects of future climate change on the metabolism and plant-herbivore interactions of GM crop cultivars are still largely unexplored, but indications for altered Bt toxin concentrations in response to elevated CO 2 have been detected on Bt cotton (Coviella et al 2000(Coviella et al , 2002Chen et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Constitutive and herbivore-inducible glucosinolate concentrations in oilseed rape (Brassica napus) leaves are not affected by Bt Cry1Ac insertion but change under elevated atmospheric CO2 and O3

Himanen

Nissinen

Auriola

et al. 2007

Planta

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Glucosinolates are plant secondary compounds involved in direct chemical defence by cruciferous plants against herbivores. The glucosinolate profile can be affected by abiotic and biotic environmental stimuli. We studied changes in glucosinolate patterns in leaves of non-transgenic oilseed rape (Brassica napus ssp. oleifera) under elevated atmospheric CO2 or ozone (O3) concentrations and compared them with those from transgenic for herbivore-resistance (Bacillus thuringiensis Cry1Ac endotoxin), to assess herbivory dynamics. Both elevated CO2 and O3 levels decreased indolic glucosinolate concentrations in transgenic and non-transgenic lines, whereas O3 specifically increased the concentration of an aromatic glucosinolate, 2-phenylethylglucosinolate. The herbivore-inducible indolic glucosinolate response was reduced in elevated O3 whereas elevated CO2 altered the induction dynamics of indolic and aliphatic glucosinolates. Herbivore-resistant Bt plants experienced minimal leaf damage after target herbivore Plutella xylostella feeding, but exhibited comparatively similar increase in glucosinolate concentrations after herbivory as non-transgenic plants, indicating that the endogenous glucosinolate defence was not severely compromised by transgenic modifications. The observed differences in constitutive and inducible glucosinolate concentrations of oilseed rape under elevated atmospheric CO2 and O3 might have implications for plant-herbivore interactions in Brassica crop-ecosystems in future climate scenarios.

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Interactions of Elevated Co₂and Nitrogen Fertilization: Effects on Production ofBacillus thuringiensisToxins in Transgenic Plants

Cited by 40 publications

References 31 publications

Nematode diversity in soil from a field trial with decomposing Bt cotton expressing Cry1Ac and Cry2Ab2 protein

Nematode diversity in soil from a field trial with decomposing Bt cotton expressing Cry1Ac and Cry2Ab2 protein

Bt cotton planting does not affect the community characteristics of rhizosphere soil nematodes

Constitutive and herbivore-inducible glucosinolate concentrations in oilseed rape (Brassica napus) leaves are not affected by Bt Cry1Ac insertion but change under elevated atmospheric CO2 and O3

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Interactions of Elevated Co2and Nitrogen Fertilization: Effects on Production ofBacillus thuringiensisToxins in Transgenic Plants

Cited by 40 publications

References 31 publications

Nematode diversity in soil from a field trial with decomposing Bt cotton expressing Cry1Ac and Cry2Ab2 protein

Nematode diversity in soil from a field trial with decomposing Bt cotton expressing Cry1Ac and Cry2Ab2 protein

Bt cotton planting does not affect the community characteristics of rhizosphere soil nematodes

Constitutive and herbivore-inducible glucosinolate concentrations in oilseed rape (Brassica napus) leaves are not affected by Bt Cry1Ac insertion but change under elevated atmospheric CO2 and O3

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Interactions of Elevated Co₂and Nitrogen Fertilization: Effects on Production ofBacillus thuringiensisToxins in Transgenic Plants