共查询到19条相似文献,搜索用时 171 毫秒
1.
2.
3.
4.
5.
6.
7.
新一代转基因植物研究进展 总被引:12,自引:0,他引:12
转基因植物具有抗病、抗虫、抗逆、高产、营养成分改善等优良性状,但其安全性引起了人们的关注。新一代植物转基因技术,如叶绿体基因工程、基因约束、多基因共转、去除抗性标记基因、对外源基因进行实时监控、抗性管理策略、最小程度地改变基因等技术的发展,将使未来的转基因植物更好地适应人们的需求,更有利于消费者食用安全和生态环境的可持续发展 。 相似文献
8.
卡那霉素在植物转基因中的应用及其抗性基因的生物安全性评价 总被引:26,自引:0,他引:26
介绍了卡那霉素在转基因植物筛选中的作用机理及其在植物转化过程和转化后代中的应用现状。卡那霉素不仅在植物转化过程中可起到筛选作用,而且在转化后代中可通过其对后代进行遗传分析和测定种子纯度,同时还可用于后代田间成株的筛选。随着卡那霉素的广泛使用,卡那霉素抗性基因的安全性问题日益受到重视。概述了转基因植物的杂草化、卡那霉素抗性基因的水平扩散、抗生素医疗安全性和食用安全性等方面的研究进展 。 相似文献
9.
转基因食品的安全性探讨 总被引:2,自引:0,他引:2
转基因食品近几年成了大众关注的一个热点问题,但普遍存在一些错误观点。从转基因食品常用的基因,如抗生素抗性基因、Bt基因、抗除草剂抗性基因、人或动物基因等,分析其食用安全性, 排除对转基因食品的疑惑。 相似文献
10.
转基因植物中的卡那霉素抗性 总被引:6,自引:0,他引:6
在转基因植物中一个经常使用的标记基因就是卡那霉素抗性基因。对转基因植物的安全性估价将对于现代植物育种的普及和接受十分有利。对于这个标记基因的生物安全性进行估测认为,没有必要对含这个基因的转基因植物进行注册的限制。 相似文献
11.
Biosafety and risk assessment framework for selectable marker genes in transgenic crop plants: a case of the science not supporting the politics 总被引:1,自引:0,他引:1
Ramessar K Peremarti A Gómez-Galera S Naqvi S Moralejo M Muñoz P Capell T Christou P 《Transgenic research》2007,16(3):261-280
Selectable marker gene systems are vital for the development of transgenic crops. Since the creation of the first transgenic plants in the early 1980s and their subsequent commercialization worldwide over almost an entire decade, antibiotic and herbicide resistance selectable marker gene systems have been an integral feature of plant genetic modification. Without them, creating transgenic crops is not feasible on purely economic and practical terms. These systems allow the relatively straightforward identification and selection of plants that have stably incorporated not only the marker genes but also genes of interest, for example herbicide tolerance and pest resistance. Bacterial antibiotic resistance genes are also crucial in molecular biology manipulations in the laboratory. An unprecedented debate has accompanied the development and commercialization of transgenic crops. Divergent policies and their implementation in the European Union on one hand and the rest of the world on the other (industrialized and developing countries alike), have resulted in disputes with serious consequences on agricultural policy, world trade and food security. A lot of research effort has been directed towards the development of marker-free transformation or systems to remove selectable markers. Such research has been in a large part motivated by perceived problems with antibiotic resistance selectable markers; however, it is not justified from a safety point of view. The aim of this review is to discuss in some detail the currently available scientific evidence that overwhelmingly argues for the safety of these marker gene systems. Our conclusion, supported by numerous studies, most of which are commissioned by some of the very parties that have taken a position against the use of antibiotic selectable marker gene systems, is that there is no scientific basis to argue against the use and presence of selectable marker genes as a class in transgenic plants. 相似文献
12.
Overexpression of an Arabidopsis thaliana ABC transporter confers kanamycin resistance to transgenic plants 总被引:1,自引:0,他引:1
Selectable markers of bacterial origin such as the neomycin phosphotransferase type II gene, which can confer kanamycin resistance to transgenic plants, represent an invaluable tool for plant engineering. However, since all currently used antibiotic-resistance genes are of bacterial origin, there have been concerns about horizontal gene transfer from transgenic plants back to bacteria, which may result in antibiotic resistance. Here we characterize a plant gene, Atwbc19, the gene that encodes an Arabidopsis thaliana ATP binding cassette (ABC) transporter and confers antibiotic resistance to transgenic plants. The mechanism of resistance is novel, and the levels of resistance achieved are comparable to those attained through expression of bacterial antibiotic-resistance genes in transgenic tobacco using the CaMV 35S promoter. Because ABC transporters are endogenous to plants, the use of Atwbc19 as a selectable marker in transgenic plants may provide a practical alternative to current bacterial marker genes in terms of the risk for horizontal transfer of resistance genes. 相似文献
13.
无标记(Marker—Free):转基因植物研究的新趋势 总被引:13,自引:0,他引:13
目前 ,几乎所有的植物遗传转化中都要使用选择性标记基因诸如抗生素或除草剂抗性基因等来筛选转化子。为了消除由此而引起的公众的安全性顾虑 ,一种全新的发展策略即获取无选择标记的转基因植物应运而生。无选择标记的转基因植物具有许多独特的优势 ,如消除大众对转基因植物中含有选择标记基因而引起的恐惧及可以反复地向已转化的植物中叠加外源基因等 ,因此 ,这种新策略 (无标记 )有着巨大的应用潜力。本文对获得无标记转基因植物的一些途径做一综述。 相似文献
14.
目前,几乎所有的植物遗传转化中都要使用选择性标记基因诸如抗生素或除草剂抗性基因等来筛选转化子.为了消除由此而引起的公众的安全性顾虑,一种全新的发展策略即获取无选择标记的转基因植物应运而生.无选择标记的转基因植物具有许多独特的优势,如消除大众对转基因植物中含有选择标记基因而引起的恐惧及可以反复地向已转化的植物中叠加外源基因等,因此,这种新策略(无标记)有着巨大的应用潜力.本文对获得无标记转基因植物的一些途径做一综述. 相似文献
15.
Biosafety implications of selectable marker genes that are integrated into the transgenic plants are discussed. In the laboratory, selectable marker genes are used at two stages to distinguish transformed cells out of a large population of nontransformed cells: 1) initial assembly of gene cassettes is generally done in E. coli on easily manipulatable plasmid vectors that contain the selectable marker genes which often code for antibiotic inactivating enzymes, and 2) Then the gene cassettes are inserted into the plant genome by various transformation methods. For selection of transformed plant cells, antibiotic and herbicide resistance genes are widely used. Consequently, transgenic plants can end up with DNA sequences of selectable markers that are functional in E. coli and plants. The potential for horizontal gene transfer of selectable markers from transgenic plants to other organisms both in the environment and in the intestine of humans and animals is evaluated. Mechanisms and consequences of the transfer of marker genes from plants to other organisms is examined. Strategies to avoid marker genes in plants are discussed. It is possible to avoid the use of controversial selectable markers in the construction of transgenic plants. 相似文献
16.
Environmentally friendly approaches to genetic engineering 总被引:4,自引:0,他引:4
Henry Daniell 《In vitro cellular & developmental biology. Plant》1999,35(5):361-368
Summary Several environmental problems related to plant genetic engineering may prohibit advancement of this technology and prevent
realization of its full potential. One such common concern is the demonstrated escape of foreign genes through pollen dispersal
from transgenic crop plants to their weedy relatives, creating super weeds or causing gene pollution among other crops or
toxicity of transgenic pollen to nontarget insects. The high rates of gene flow from crops to wild relatives (as high as 38%
in sunflower and 50% in strawberries) are certainly a serious concern. Maternal inheritance of the herbicide resistance gene
via chloroplast genetic engineering has been shown to be a practical solution to these problems. Another common concern is
the suboptimal production of Bacillus thuringiensis (Bt) insecticidal protein or reliance on a single (or similar) B.t. protein in commercial transgenic crops, resulting in
B.t. resistance among target pests. Clearly, different insecticidal proteins should be produced in lethal quantities to decrease
the development of resistance. Such hyperexpression of a novel B.t. protein in chloroplasts has resulted in 100% mortality
of insects that are up to 40 000-fold resistant to other B.t. proteins. Yet another concern is the presence of antibiotic
resistance genes in transgenic plants that could inactivate oral doses of the antibiotic or be transferred to pathogenic microbes
in the GI tract or in soil, rendering them resistant to treatment with such antibiotics. Cotransformation and elimination
of antibiotic resistant genes from transgenic plants using transposable elements via breeding are promising new approaches.
Genetic engineering efforts have also addressed yet another concern, i.e., the accumulation and persistence of plastics in
our environment by production of biodegradable plastics. Recent approaches and accomplishments in addressing these environmental
concerns via chloroplast genetic engineering are discussed in this review. 相似文献
17.
Hee-Jong Woo Seok-Cheol Suh Yong-Gu Cho 《Biotechnology and Bioprocess Engineering》2011,16(6):1053-1064
The development of marker-free transgenic plants has responded to public concerns over the safety of biotechnology crops.
It seems that continued work in this area will soon remove the question of unwanted marker genes from the debate concerning
the public acceptability of transgenic crop plants. Selectable marker genes are co-introduced with genes of interest to identify
those cells that have integrated the DNA into their genome. Despite the large number of different selection systems, marker
genes that confer resistance to the antibiotics, hygromycin (hpt) and kanamycin (nptII) or herbicide phosphinothricin (bar), have been used in most transgenic research and crop development techniques. The techniques that remove marker gene are
under development and will eventually facilitate more precise and subtle engineering of the plant genome, with widespread
applications in both fundamental research and biotechnology. In addition to allaying public concerns, the absence of resistance
genes in transgenic plants could reduce the costs of developing biotechnology crops and lessen the need for time-consuming
safety evaluations, thereby speeding up the commercial production of biotechnology crops. Many research results and various
techniques have been developed to produce marker-free transgenic plants. This review describes the strategies for eliminating
selectable marker genes to generate marker-free transgenic plants, focusing on the three significant marker-free technologies,
co-transformation, site-specific recombinase-mediated excision, and non-selected transformation. 相似文献
18.
Marker-free transformation: increasing transformation frequency by the use of regeneration-promoting genes 总被引:12,自引:0,他引:12
The generation of transgenic plants free of antibiotic resistance markers is a major challenge to plant biologists and plant breeders. Currently, there are two main strategies to achieve this goal: one approach is to excise or segregate marker genes from the host genome after regeneration of transgenic plants, and the second is based on so-called 'marker-free' transformation. Marker-free transformation has been successfully demonstrated by the use of several plant and non-plant genes that are capable of promoting explant regeneration. This approach appears not only to be effective for the generation of marker-free transgenic plants, but also has great potential to improve the transformation frequency of recalcitrant species. 相似文献
19.
Zhoupeng Xie Jens F. Sundström Yunkai Jin Chunlin Liu Christer Jansson Chuanxin Sun 《The Plant journal : for cell and molecular biology》2014,77(6):954-961
Antisense oligodeoxynucleotide (asODN) inhibition was developed in the 1970s, and since then has been widely used in animal research. However, in plant biology, the method has had limited application because plant cell walls significantly block efficient uptake of asODN to plant cells. Recently, we have found that asODN uptake is enhanced in a sugar solution. The method has promise for many applications, such as a rapid alternative to time‐consuming transgenic studies, and high potential for studying gene functionality in intact plants and multiple plant species, with particular advantages in evaluating the roles of multiple gene family members. Generation of transgenic plants relies on the ability to select transformed cells. This screening process is based on co‐introduction of marker genes into the plant cell together with a gene of interest. Currently, the most common marker genes are those that confer antibiotic or herbicide resistance. The possibility that traits introduced by selectable marker genes in transgenic field crops may be transferred horizontally is of major public concern. Marker genes that increase use of antibiotics and herbicides may increase development of antibiotic‐resistant bacterial strains or contribute to weed resistance. Here, we describe a method for selection of transformed plant cells based on asODN inhibition. The method enables selective and high‐throughput screening for transformed cells without conferring new traits or functions to the transgenic plants. Due to their high binding specificity, asODNs may also find applications as plant‐specific DNA herbicides. 相似文献