Effects of water management practices on residue decomposition and degradation of Cry1Ac protein from crop-wild Bt rice hybrids and parental lines during winter fallow season

Xiao, Mingzhong; Dong, Shanshan; Li, Zhaolei; Xu, Tao; Chen, Yi; Yang, Shengmao; Wu, Chunyan; Ouyang, Dongxin; Fang, Changming; Song, Zilin

doi:10.1016/j.ecoenv.2015.08.008

Cited by 11 publications

(6 citation statements)

References 47 publications

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“…Under laboratory conditions, degradation of Cry1Ac protein in soil plateaued eventually (despite faster initial degradation), leaving 15.3% of the initial concentration in the leaf–soil mixture after 135 d, whereas none was detectable in water by this point . In contrast, Xiao et al were unable to detect the protein in the soil surrounding the litterbags of plant materials in the field. This lack of consistency is thought to reflect different methodologies in terms of sample preparation .…”

Section: Entry Routes and Exposure Pathways Of Bt Toxins And Plant Mamentioning

confidence: 94%

“…In contrast, Xiao et al were unable to detect the protein in the soil surrounding the litterbags of plant materials in the field. This lack of consistency is thought to reflect different methodologies in terms of sample preparation .…”

Section: Entry Routes and Exposure Pathways Of Bt Toxins And Plant Mamentioning

confidence: 95%

“…Experiments that tracked the decrease in concentration of Cry1Ac protein in Bt rice plant residues in soil compared with an aquatic milieu have been performed under laboratory and field conditions . In both cases, degradation was found to be somewhat slower under aquatic conditions, at least initially.…”

Section: Entry Routes and Exposure Pathways Of Bt Toxins And Plant Mamentioning

confidence: 99%

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Interactions between Bt crops and aquatic ecosystems: A review

Venter

Bøhn

2016

Enviro Toxic and Chemistry

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Abstract:The term Bt crops collectively refers to crops that have been genetically modified to include a gene (or genes) sourced from Bacillus thuringiensis (Bt) bacteria. These genes confer the ability to produce proteins toxic to certain insect pests. The interaction between Bt crops and adjacent aquatic ecosystems has received limited attention in research and risk assessment, despite the fact that some Bt crops have been in commercial use for 20 yr. Reports of effects on aquatic organisms such as Daphnia magna, Elliptio complanata, and Chironomus dilutus suggest that some aquatic species may be negatively affected, whereas other reports suggest that the decreased use of insecticides precipitated by Bt crops may benefit aquatic communities. The present study reviews the literature regarding entry routes and exposure pathways by which aquatic organisms may be exposed to Bt crop material, as well as feeding trials and field surveys that have investigated the effects of Bt-expressing plant material on such organisms. The present review also discusses how Bt crop development has moved past single-gene events, toward multigene stacked varieties that often contain herbicide resistance genes in addition to multiple Bt genes, and how their use (in conjunction with co-technology such as glyphosate/Roundup) may impact and interact with aquatic ecosystems. Lastly, suggestions for further research in this field are provided. Environ Toxicol Chem 2016;35:2891-2902. # 2016 SETAC

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Section: Entry Routes and Exposure Pathways Of Bt Toxins And Plant Mamentioning

confidence: 94%

Section: Entry Routes and Exposure Pathways Of Bt Toxins And Plant Mamentioning

confidence: 95%

Section: Entry Routes and Exposure Pathways Of Bt Toxins And Plant Mamentioning

confidence: 99%

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Interactions between Bt crops and aquatic ecosystems: A review

Venter

Bøhn

2016

Enviro Toxic and Chemistry

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“…On the other hand, an increasing number of studies indicate that the fitness effect of introgressed transgenes is markedly influenced by the genetic background of recipient populations (e.g. Kirk et al ., ; Di et al ., ; Dong et al ., ; Xiao et al ., ). Nevertheless, studies that consider the effects of genetics and environment together, that is the effects of interaction between growing environment and genetic background of recipients on fitness performance of transgenic hybrids, are still lacking.…”

Section: Introductionmentioning

confidence: 97%

Persistence of transgenes in wild rice populations depends on the interaction between genetic background of recipients and environmental conditions

Dong

Xiao

Ouyang

et al. 2017

Annals of Applied Biology

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The persistence of transgenes in wild populations may cause unintended ecological consequences, and the possibility of transgenes' persistence and introgression is dependent on fitness performance of transgenic crop-wild hybrids. To investigate the effects of transgene and genotype × environment on the fitness of crop-wild rice hybrids, a total of 11 cross-combination progenies between insect-resistant transgene (CpTI and Bt/CpTI) rice lines and wild rice (Oryza rufipogon) were evaluated at different sites with contrasting insect treatments. The results showed that fitness performance varied between transgenic hybrids having different wild parents and under different environmental conditions, indicating that fitness effects of transgenes on hybrid progenies depend heavily on the genetic background of recipient plants and growing environment. Significant fitness advantages conferred by transgenes were found only in some hybrids under high insect pressure condition, demonstrating that the level of target insects in the field environment influences the persistence and spread of insect-resistant transgenes in wild rice populations. These findings suggest that evolutionary fate of escaped transgenes is different in wild populations with diverse genetic backgrounds under various environmental conditions.

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“…Song et al [34] estimated the fitness of crop-wild F 1 hybrids (without the involvement of any transgene) in a commongarden field experiment, where the crop-wild F 1 hybrids did not show a consistent trend of fitness changes compared to their wild (O. rufipogon) and cultivated rice parents. Although further fitness studies of crop-wild rice hybrid descendants with insect-resistance transgenes (Bt and CpTI, cowpea trypsin inhibitor) did not show considerable effects of the transgenes on seed germination and dormancy [35], and on litterbag decomposition of hybrid residues [36]. Nevertheless, little is known about the lifecycle fitness change associated with insect-resistance transgenes in wild rice hybrid populations.…”

Section: Introductionmentioning

confidence: 99%