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植物修复的促进措施及根际微生物的作用 总被引:5,自引:0,他引:5
目前研究表明,植物修复(Phytoremediation)技术在实际重金属污染土壤的修复中还存在一些不足之处,例如植物生物量较小、生长缓慢、土壤重金属生物有效性较低等。为了使植物修复成为一个可行的环境修复技术,国内外的许多研究表明可以通过一些促进措施来提高植物修复的修复效率;同时发现根际微生物在植物修复过程中发挥着一定的作用。本文着重评述杂交育种(Hybridization)技术、转基因(Transgenic Engineering)技术、螯合剂(Chelator)在植物修复中的应用,以及细菌、菌根真菌根际微生物(Rhizomicrobes)在植物修复过程中的作用。 相似文献
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Himanen SJ Nerg AM Nissinen A Stewart CN Poppy GM Holopainen JK 《Environmental pollution (Barking, Essex : 1987)》2009,157(1):181-185
Sustained cultivation of Bacillus thuringiensis (Bt) transgenic crops requires stable transgene expression under variable abiotic conditions. We studied the interactions of Bt toxin production and chronic ozone exposure in Bt cry1Ac-transgenic oilseed rape and found that the insect resistance trait is robust under ozone elevations. Bt Cry1Ac concentrations were higher in the leaves of Bt oilseed rape grown under elevated ozone compared to control treatment, measured either per leaf fresh weight or per total soluble protein of leaves. The mean relative growth rate of a Bt target herbivore, Plutella xylostella L. larvae was negative on Bt plants in all ozone treatments. On the non-transgenic plants, larval feeding damage was reduced under elevated ozone. Our results indicate the need for monitoring fluctuations in Bt toxin concentrations to reveal the potential of ozone exposure for altering dosing of Bt proteins to target and non-target herbivores in field environments experiencing increasing ozone pollution. 相似文献
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以转小鼠金属硫蛋白-Ⅰ基因(mMT-I)聚球藻7002为对象,研究了其在含Cd2 、Pb2 和Hg2 的培养基中的生长特性及其对重金属的净化性能.结果表明,无论从生长速率还是对重金属的耐受特性来看,转 m MT-Ⅰ聚球藻7002均明显优于野生藻;随着培养进程的延续和细胞浓度逐渐提高,体系中Cd2 、pb2 和Hg2 的浓度逐渐降低,降幅最大的时间约在试验开始后1-3 d左右;经3 d培养,转mMT-Ⅰ聚球藻细胞对Cd2 、pb2 和Hg2 的净化率分别为63.90%、65.99%和96.27%,吸附量分别为10.75、58.89和112.61 mg·g-1,而野生聚球藻的吸附量分别为3.40、27.01和1.12 mg·g-1,前者分别是后者的3.16、2.18和100.45倍;并建立了操作时间和细胞浓度对净化率的单因子模型,以及总括动力学模型方程,模型对实验结果拟合良好. 相似文献
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《Journal of environmental science and health. Part. B》2013,48(3):463-473
Abstract In order to make regulations that safeguard food and the environment, an understanding of the fate of transgenes from genetically modified (GM) plants is of crucial importance. A compost experiment including mature transgenic corn plants and seeds of event Bt 176 (Zea mays L.) was conducted to trace the fate of the transgene cryIA(b) during the period of composting. In bin 1, shredded corn plants including seeds were composted above a layer of cow manure and samples from the corn layer were collected at intervals during a 12-month period. The samples were tested for the transgene persistence and microbial counts and also the compost was monitored for temperature. In bin 2, piles of corn seeds, surrounded by sheep manure and straw, were composted for 12 months. A method combining nested polymerase chain reaction (PCR) and southern hybridization was developed for detection of the transgene in compost. The detection sensitivity was 200 copies of the transgene per gram of dry composted corn material. Composting commenced on day 0, and the transgene was detected in specimens from bin 1 on days 0 and 7 but not on day 14 or thereafter. The transgene in corn seeds was not detectable after 12 months of composting in bin 2. Temperatures in both bins rose to about 50°C within 2 weeks and remained above that temperature for about 3 months, even when the ambient temperature dropped below ?20°C. Extracts from compost were inoculated onto culture plates and then were incubated at 23 to 55°C. Within the first 2 weeks of composting in bin 1, the counts of bacteria incubated at 55°C increased from 3.5 to 7.5 log 10, whereas those incubated at 23°C remained at about 7.5 log 10. The counts of fungi incubated at 45°C increased slightly from 2.5 to 3.1 log10, but those incubated at 23°C decreased from 6.3 to 3.0 log 10. The rapid degradation of the transgene during composting of Bt corn plants suggested that the composting process could be used for safe disposal of transgenic plant wastes. 相似文献
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转基因技术在植物修复重金属污染土壤研究中的新进展 总被引:1,自引:0,他引:1
综述了植物修复的相关机制及其进展和发展方向.随着一些功能基因的鉴定和分离,利用转基因技术提高植物对重金属的积累能力已取得了一些进展,开拓了植物修复的新领域. 相似文献