Effects of N treatments on the yield advantage of Bt-SY63 over SY63 (Oryza sativa) and the concentration of Bt protein

Wang, Fei; Jian, Zaiping; Cui, Kehui; Peng, Shaobing; Lin, Yongjun; Huang, Jikun

doi:10.1016/j.fcr.2012.01.011

Cited by 24 publications

(23 citation statements)

References 31 publications

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“…During the past 20 years, numerous insect resistance genes have been identified, some of which have anti-lepidopteron activity ( cry1Aa, cry1Ab, cry1Ac, cry1Ab/Ac, cry1C, cry2A , and CpT1 ), whereas others exhibit anti-helipterum activity ( Galanthus nivalis agglutinin, gna , and Pinellia ternata agglutinin, pta ). These genes have been introduced into rice to develop insect-resistant transgenic lines (Shu et al, 1998, 2000; Tan et al, 2011; Wang et al, 2012a,b; Jiang et al, 2013b; Jian et al, 2014). Currently, most insect-resistant transgenic rice lines in China are in the field trial stage (Tang et al, 2006; Wang et al, 2012a,b).…”

Section: Introductionmentioning

confidence: 99%

“…These genes have been introduced into rice to develop insect-resistant transgenic lines (Shu et al, 1998, 2000; Tan et al, 2011; Wang et al, 2012a,b; Jiang et al, 2013b; Jian et al, 2014). Currently, most insect-resistant transgenic rice lines in China are in the field trial stage (Tang et al, 2006; Wang et al, 2012a,b). Experimental results have indicated that transgenic rice effectively resists lepidopteron damage in field and reduces environmental and crop contamination by reducing pesticide application rates.…”

Section: Introductionmentioning

confidence: 99%

“…Another potential problem associated with the use of these crops is a possible change in the fitness of Bt transgenic rice under various environmental conditions, as reported by several studies (Wang et al, 2012a,b; Jiang et al, 2013b; Li et al, 2013; Jian et al, 2014). In particular, different insect pressure conditions vary in terms of their fitness effects on vegetative and reproductive growth abilities of transgenic rice.…”

Section: Introductionmentioning

confidence: 99%

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Fitness Cost of Transgenic cry1Ab/c Rice Under Saline-Alkaline Soil Condition

Song

Liu

et al. 2018

Front. Plant Sci.

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The environmental release and biosafety of transgenic Bt crops have attracted global attention. China has a large area of saline-alkali land, which is ideal for large-scale production of Bt transgenic rice. Therefore an understanding of the fitness of Bt transgenic rice in saline-alkaline soils and the ability to predict its long-term environmental effects are important for the future sustainable use of these crops. In the present study, we aimed to evaluate the fitness of cry1Ab/c transgenic rice in both farmland and natural ecosystems. Transgenic cry1Ab/c rice Huahui1, for which a national biosafety certificate was obtained, was grown on normal farmland and saline-alkaline soils in a glass greenhouse. The expression pattern of exogenous Cry1Ab/c protein, and vegetative and reproductive fitness of rice were assessed. The expression of the exogenous Cry1Ab/c protein in the transgenic rice grown on saline-alkaline soil was lower than that in the strain grown on farmland soil. Under both the soil conditions, vegetative growth abilities, as evaluated by tiller number and biomass, and reproductive growth abilities, as measured by filled grain number and filled grain weight per plant, showed a significantly higher fitness cost for Huahui1 than that for the parental rice Minghui63 grown under the same soil conditions. In saline-alkaline soil, the fitness cost of Huahui1was moderately higher than that of Minghui63. Therefore, the ecological risk of cry1Ab/c transgenic rice is not expected to be higher than that of parental rice Minghui63 if the former escapes into natural saline-alkaline soil. The results of the present study provide a scientific basis to improve environmental safety assessment of the insect-resistant transgenic rice strain Huahui1 before commercialization.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fitness Cost of Transgenic cry1Ab/c Rice Under Saline-Alkaline Soil Condition

Song

Liu

et al. 2018

Front. Plant Sci.

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“…Changes in crop traits and the quantity and/or quality of C input into the soil may affect soil carbon cycling 39, 40 . It has been reported that Bt rice had a different tiller number 41 and net photosynthetic rate 42 , leading to differences in crop biomass between Bt and non- Bt crops. Saxena and Stotzky 43 pointed out that lignin concentration of Bt maize was 33–97% higher than those of non- Bt ones, partly due to a greater diameter of vascular bundle and surrounding lignin cell.…”

Section: Discussionmentioning

confidence: 99%

Effects of long-term cultivation of transgenic Bt rice (Kefeng-6) on soil microbial functioning and C cycling

Zhaolei

Jun

et al. 2017

Sci Rep

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Understanding how soil ecosystem responds to transgenic Bacillus thuringiensis (Bt) rice is necessary for environmental risk assessment. While the influences of short-term cultivation of Bt rice on soil properties have been reported previously, little is known about the long-term effects of Bt rice on soil ecosystems. In this study, soil samples were taken from a long-term rice cultivation site in Fujian Province, China, where transgenic Bt rice (Kefeng-6) and its non-Bt parent breed (Minghui-86) had been continuously cultivated for 8 years. Soil Bt protein concentration and a total of 16 variables were analyzed to assess potential risks of soil health under Bt rice cultivation. The results revealed that soil Bt protein is unlikely to accumulate after Bt rice cultivated in the field, and no consistently significant changes were observed in soil enzymatic activities (catalase, dehydrogenase, acid phosphatase, and urease), microbial biomass (microbial carbon and nitrogen), total organic carbon, decomposition (soil respiration, Q 10, and qCO2), soil nitrogen and phosphorus contents. Due to a local tradition that aboveground biomass was removed after harvest, the increased net primary productivity by Bt rice cultivation did not significantly change soil C cycling. Results of this study suggested that on the aspects of soil microbial functioning and C cycling, long-term cultivation of Bt rice is unlikely to result in significant effects on soil health.

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“…Nitrogen deficit caused a larger reduction in both vegetative and reproductive organs, which may be related to Bt protein synthesis in Bt cotton. Therefore, the N deficit affected both lint and Bt protein production in the Bt cotton cultivars (Bruns and Abel, 2003;Wang et al, 2012); application of enough N is important to supply the N nourishment for both reproductive organ development and the insecticidal protein in Bt cotton.…”

Section: Effect Of Nitrogen Application On Vegetative and Reproductivmentioning

confidence: 99%

Changed Growth Characteristics with Bacillus thuringiensis Gene Introduction and Nitrogen Regulation in Bt Cotton

et al. 2017

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Changes in vegetative and reproductive growth have been widely observed in Bacillus thuringiensis (Bt) transgenic cotton (Gossypium hirsutum L.). Th e objectives of this study were to determine the characteristics of vegetative and reproductive growth aft er the Bt gene was introduced into cotton and to study the eff ect of N on vegetative and reproductive growth to determine if N nourishment could provide a potential mechanism for changed growth characteristics in Bt cotton. Th ree Bt cultivars (Sikang1, Ccsi41, and Ccsi45), with their current parents (Simian3, Ccsi23, and Jimian7, respectively), were chosen to compare the characteristics of vegetative and reproductive growth and N distribution, in 2011 to 2012; the same six cultivars with two N fertilizer application rate treatments (0 and 450 kg/ha) were further designed to investigate the N regulation impact on growth in 2013. Th e results indicated that the Bt cotton cultivars had higher growth rates of main stem leaf area, sympodium leaf number, and plant height and a lower growth rate of sympodium leaf area than their parents. Higher numbers and development rates of fruiting nodes, fruiting branches, bolls, and retained boll rates were also observed but lower fruiting branch positions than their parents. Th e N-defi cit and N-rich treatments aff ected both vegetative and reproductive growth of Bt cultivars. Core Ideas• Bt cotton cultivars had higher sympodium leaf number and plant height.• Bt cotton cultivars had higher growth rates of main stem leaf and lower growth rate of sympodium leaf area.• Bt cotton cultivars had higher numbers of fruiting branches, fruiting nodes, bolls, and retained boll rates.• N-defi cit and N-rich treatments aff ected number and rates of vegetative and reproductive organs. CROP ECOLOGY & PHYSIOLOGY

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Effects of N treatments on the yield advantage of Bt-SY63 over SY63 (Oryza sativa) and the concentration of Bt protein

Cited by 24 publications

References 31 publications

Fitness Cost of Transgenic cry1Ab/c Rice Under Saline-Alkaline Soil Condition

Fitness Cost of Transgenic cry1Ab/c Rice Under Saline-Alkaline Soil Condition

Effects of long-term cultivation of transgenic Bt rice (Kefeng-6) on soil microbial functioning and C cycling

Changed Growth Characteristics with Bacillus thuringiensis Gene Introduction and Nitrogen Regulation in Bt Cotton

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