Changes in levels, species and DNA fingerprints of soil microorganisms associated with cotton expressing the Bacillus thuringiensis var. kurstaki endotoxin

Donegan, Katherine; Palm, Curtis J.; Fieland, Valerie J.; Porteous, Lorna; Ganio, Lisa M.; Schaller, D. L.; Bucao, L.Q.; Seidler, Ramon J.

doi:10.1016/0929-1393(94)00043-7

Cited by 232 publications

(176 citation statements)

References 19 publications

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“…Earlier, Sarkar et al (2009) reported a significant correlation between root volume of Bt cotton and soil MBC that supports the findings of Lynch and Panting (1980) that soil MBC increased with root growth and rooting density of the crop. Moreover, significantly higher population of different microbial groups was reported in field plots under transgenic alfalfa (Medicago sativa L.) (Donegan and Seidler 1999), cotton (Donegan et al 1995), papaya (Wei et al 2006), and maize (Griffiths et al 2006). Impact of Bt cotton on soil culturable microbial population and diversity indices.…”

Section: Resultsmentioning

confidence: 99%

Impact of transgenic cottons expressing cry1Ac on soil biological attributes

Velmourougane¹,

Sahu²

2013

PLANT SOIL ENVIRON

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Three transgenic Bt cotton hybrids (RCH-2 Bt, Bunny Bt and NHH 44 Bt) expressing cry1Ac gene were evaluated for their effects on soil biological, microbiological and diversity attributes at 0-15 cm and 15-30 cm soil depth under field conditions. At both soil depths, soil respiration rate and fluorescein diacetate hydrolysis were the highest in the soil under Bt cotton grown followed by non-Bt soil, and by the control bulk soil, indicating no adverse effects of Bt cotton on soil microbial activity. Urease and dehydrogenase activities, reflecting potentially available N and the oxidative metabolism in soil, respectively, also increased in the sequence no-crop variant < non-Bt soil < soil under Bt cotton at both soil depths. A similar trend was found with the soil microbial biomass carbon, microbial population and microbial diversity indices. These results suggest that cultivation of Bt cotton expressing cry1Ac gene may not pose ecological or environmental risk.

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Section: Resultsmentioning

confidence: 99%

Impact of transgenic cottons expressing cry1Ac on soil biological attributes

Velmourougane¹,

Sahu²

2013

PLANT SOIL ENVIRON

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“…However there were no significant differences in the population size of these microorganisms in rhizosphere soil between the transgenic Bt-cotton NC 33B and its near-isogenic comparator DP 5415 (Table 1), with the exception of actinomycetes at budding in 2011 (Figure 3). Most studies proved that transgenic Bt crops had no significant effects on microbial population sizes in soil, or only had the transient effects (Donegan et al 1995, Saxena and Stotzky 2002. Our results were in accordance not only with the above studies that the transgenic trait had no significant or minor effects on microbial population size in rhizosphere soil, but also a recent report that the transgenic cotton NC 33B has no apparent impact on the population size of microorganisms in soil (expressed as the CFUs by the selective cultivation method) (Zhang et al 2015).…”

Section: Resultsmentioning

confidence: 99%

Dynamics of microbial population size in rhizosphere soil of Monsanto's Cry1Ac cotton

Zhang¹,

Xie²,

Peng³

et al. 2016

PLANT SOIL ENVIRON

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“…Cotton tissue/ Laboratory Experiments were carried out with field grown Detectable residues Detection of toxin and insecticidal [173] Cry1Ab and cotton tissue/soil/purified toxins in microcosms (ELISA) a insecticidal activity at termination …”

Section: Bt-toxin Conditionsmentioning

confidence: 99%