uses of biotechnology in plant breeding
This was a tomato paste from tomatoes in which the enzyme polygalacturonase had also been down‐regulated so that the paste was claimed to be appreciably thicker and better tasting. amylopectin levels can be reduced to almost zero by expressing an antisense copy of the granule‐bound starch synthase gene in potato tubers (Visser et al., 1992). University of California Davis. The cost of PHAs could be considerably reduced if they were produced on an agricultural scale in transgenic crops. There are several other groups attempting to make PHAs in plants (including one in oil palm), and it will be interesting to see whether these environmentally friendly products can indeed be produced as a viable commercial venture. In the future, the re‐engineering of storage, or other, proteins in seeds will have to take into account the various signaling motifs and folding patterns that enable the endogenous proteins to accumulate to such high levels in seed tissues. Such claims are hotly disputed by anti‐GM groups (e.g. In this case, the herbicide is the fungal toxin, glufosinate, which is marketed under several names including ‘Basta’ and ‘Challenge’. These amino acids are required in the human diet because they cannot be synthesised endogenously. Most applications of modern plant biotechnology can be considered to involve the manipulation of DNA sequences originally isolated from plants or other organisms. Plant‐derived oils are mainly used as commodities for the manufacture of foodstuffs. Nematodes are the major class of animal parasites of crops, causing over $100 billion in annual losses to world agriculture. control of flowering time and floral identity in, Feasible biotechnological and bioremediation strategies for serpentine soils, mine spoils, Resistance to diseases, insects in transgenic plants: progress, applications to agriculture, Bacteria and other biological systems for polyester production, Dietary glucosinolates as blocking agents against carcinogenesis: glucosinalate breakdown products assessed by induction of quinone reductase activity in murine hepa 1c1c7 cells, Enkephalins produced in transgenic plants using modified 2S seed storage proteins, Inhibition of the expression of the gene for granule‐bound starch synthase in potato by antisense constructs, Fatty acid biosynthesis redirected to medium chains in transgenic oilseed plants, Genetic engineering of a quantitative trait: metabolic and genetic parameters influencing the accumulation of laurate in rapeseed, Engineering the provitamin A (β‐carotene) biosynthetic pathway into (carotenoid‐free) rice endosperm, Metabolic engineering of medicinal plants: transgenic, Introduction of a blight‐resistance gene, Xa21, into five Chinese rice varieties through an, Engineering salt‐tolerant Brassica plants: characterization of yield and seed oil quality in transgenic plants with increased vacuolar sodium accumulation, Anticarcinogenic activities of sulforofane and other structurally related synthetic norbornyl isothiocyanates, Improving iron, zinc and vitamin A nutrition through plant biotechnology, http://www.taa.org.uk/WestCountry/corley.html, http://www.nal.usda.gov/pgdic/Probe/v4n3_4/theflp.html, www.gophisb.biotech.vt.edu/news/1995/news95.dec.html#dec9501, http://www.epa.gov/fedrgstr/EPA-IMPACT/2002/February/Day-25/i4385.htm, http://www.blonnet.com/2002/01/12/stories/2002011200151000.htm, http://www.guardian.co.uk/gmdebate/Story/0,2763,865030,00.html, http://www.ejb.org/content/vol2/issue1/full/5/index.html. One possibility is the expression of resistance genes such as the Xa21 bacterial blight‐resistant gene that was recently transferred to five Chinese rice varieties (Zhai et al., 2000). Annual and perennial crops produce a yearly output of >87 million tonnes in traded vegetable oils that is worth about $40–45 billion. Another important technique that is increasingly used in crop breeding programmes is the production of doubled haploids. Transgenic papayas that express the ringspot virus coat protein, which on its own is harmless to the plants, are considerably more resistant to infection with the active virus than are non‐transgenic papayas. This has long been touted as the basis for a new generation of high‐value crops produced for ‘molecular farming’. Although this was depicted in the literature at the time as a serious setback for agbiotech, it actually demonstrated that the quality control safeguards were effective since the problem was recognised at an early stage, and further development of these transgenic seeds was halted forthwith. Whereas most input traits can be usefully expressed constitutively, i.e. These indole alkaloids are synthesised as intermediates in an intricate series of interconnected pathways involving dozens of enzymes. This approach combines traditional breeding techniques with modern biotechnology and dramatically speeds up the breeding process. Another well‐known transgenic sterility trait is that conferred by the unfortunately named ‘terminator’ technology which was being developed by several companies, including the one acquired by Monsanto for commercial release in the late 1990s. The use of plants in ‘molecular farming’ has the potential to provide a cheap and readily accessible source of many high‐value pharmaceutical products, ranging from vaccines and antibodies to therapeutic peptides. Plant biotechnology, in the sense of the application of recombinant DNA techniques to crop improvement, or the production of valuable molecules in plants, is still a relatively new endeavour. Thirdly, biotechnology can contribute to the introduction of new markers and characteristics, which can not easily be crossed in and which have proven to be useful and valuable. Application of biotechnology or molecular biology is also known as molecular breeding . volunteer cereals in rapeseed fields and vice versa. During the past decade, genes encoding the vast majority of the enzymes involved in specifying the chain length and functionality of plant fatty acids have been isolated. methionine, and in changing the protein structure to enhance qualities, such as breadmaking ability. This is selective breeding. Greenpeace Server, http://www.greenpeace.org/~geneng/), and the ‘golden rice’ has yet to prove itself in large‐scale field and nutritional trials in the target developing countries. Two of the rare examples of such proteins are avidin and β‐glucuronidase (GUS), both produced in transgenic maize. Although deleterious to the crop, these climatic conditions actually favoured the development of the cotton bollworm, resulting in severe infestation in nearly 1 Mha of ‘resistant’ cotton crops (Kaiser, 1996). To produce a commercial transgenic variety, the Westar transformant must then be backcrossed to an elite line—a process that can take several years and add significantly to development costs. A key priority should be the development of a method in plants for the facile site‐specific insertion of genes, as already exists for animals. In view of the likelihood of more arid regions arising in the near future, it is surprising that there have been relatively few attempts to produce transgenic drought‐tolerant crops, even by publicly funded organisations. This is an important issue that often seems to escape the attention of environmentalists and government regulators alike. (Virginia Tech. Plant biotechnology, in the sense of the application of recombinant DNA techniques to crop improvement, or the production of valuable molecules in plants, is still a relatively new endeavour. Its main benefit would be to seed companies since farmers would not be able to save seed for replanting in subsequent years (as they have traditionally done in most developing countries), but would instead have to re‐purchase the seed each season from the company. Over 30 years, many GM crops have been produced with resistance to diseases or … ROOTSTOCKS: TRAINING METHODS AND FRUITING PERFORMANCES, 355_20 RESEARCH ON VARIABILITIES IN SOME IMPORTANT CHARACTERS OF GALANTHUS ELWESII HOOK. Since different crops contain different types of seed starch, the useful properties present in the starch form of one crop are often not present in other crops. Hence, the dichotomy between the acceptance of GM crops (in the United States and elsewhere) and their non‐acceptance (in Europe) may be at least partially explained by more effective producer lobbies in the former countries compared with more effective consumer lobbies in Europe. the FLAVR SAVR™ tomato, which was released for human consumption by Calgene, in 1994. Avidin expressed in transgenic tobacco leaves confers resistance to two noctuid pests, Differential expression of a senescence‐enhanced metallothionein gene in, Molecular cloning of a metallothionein‐like gene from, Production of transgenic sunflower with altered fatty acid profiles, Proceedings 1999 Symposium on Biochemistry and Molecular Biology of Plant Fatty Acids and Glycerolipids, Gene transfer with subsequent removal of the selection gene from the host genome, Milestones in chloroplast genetic engineering: an environmentally friendly era in biotechnology, Seed mixtures as a resistance management strategy for European corn borers (Lepidoptera: Crambidae) infesting transgenic corn expressing Cry1Ab protein, The evolution of apical dominance in maize, Potential for increasing the content and bioavailability of Fe, Zn and Ca in plants for human nutrition, Fungal pathogen protection in potato by expression of a plant defensin peptide, The introduction and expression of transgenes in plants, Forensic application of DNA ‘finger prints’, Iron fortification of rice seed by the soybean ferritin gene, Genome synteny in dicots: genome duplication in, various articles from: International Symposium on Transplant They open up the prospect of being able to manipulate some of the most basic features of crop plants. Transgenes in plants insert more or less randomly into the genome, the number of copies inserted can range from one to a dozen or more, and the introduced DNA sequences are frequently modified and/or fragmented in the process. This has stimulated efforts to engineer viral resistance into transgenic crops. Hence, the EU imports huge amounts of maize starch for many types of food manufacture because the starches produced in its home‐grown cereals, such as wheat and barley, do not have the appropriate structure for these applications. century: the challenges ahead, Modification of thiol contents in poplars (, Designs for engineered resistance to root‐parasitic nematodes, Biotechnology Industry Organization Server, Fruit, vegetables and cancer prevention—a review of the epidemiological evidence, Engineering new plant strains for commercial markets. Examples of Biotechnology tools used globally in plant breeding Genetic engineering is used produce transgenic/genetically modified (GM) plants containing unique characteristics. It is the chain length and branching that largely determine the physical properties of extracted starches, e.g. Many of our leading drugs were originally or still are derived from phytochemicals, e.g. The result was the first food crop to be produced by transgenic manipulation, i.e. Use the link below to share a full-text version of this article with your friends and colleagues. To put this figure of $4 billion into context, the estimated entire revenue generated by the US agbiotech sector in 1999 was just $2.3 billion, and this included all the companies supplying inputs to the sector or its employees (Ernst and Young, 2000). Future we could see ‘ golden rice ’ in developed countries are nutritionally beneficial of... 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