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Pest Resistant CropsVaccines Oral vaccines have been in the works for many years as a possible considerable promise in preliminary studies. 2. Antibiotics Plants are used to produce antibiotics for both human and animal use. Expressing antibiotic proteins in livestock feed, fed directly to animals, is less costly than traditional antibiotic production, but this practice raises many bioethics issues, because the result is widespread, possibly unneccessary use of antibiotics which may promote growth of antibiotic-resistant bacterial strains. Several advantages to using plants to produce antibiotics for humans are reduced costs due to the larger amount of product that can be produced from plants versus a fermentation unit, ease of purification, and reduced risk of contamination compared to that of using mammalian cells and culture media. Biofuels The agricultural industry plays a large role in the biofuels industry, providing the feedstocks for fermentation and refining of bio-oil, bio-diesel and bio-ethanol. Genetic engineering and enzyme optimization techniques are being used to develop better quality feedstocks for more efficient conversion and higher BTU outputs of the resulting fuel products. High-yielding, energy-dense crops can minimize relative costs associated with harvesting and transportation (per unit of energy derived), resulting in higher value fuel products. Plant and Animal Breeding Enhancing plant and animal traits by traditional methods like cross-pollination, grafting, and cross-breeding is time-consuming. Biotech advances allow for specific changes to be made quickly, on a molecular level through over-expression or deletion of genes, or the introduction of foreign genes. The latter is possible using gene expression control mechanisms such as specific gene promoters and transcription factors. Methods like marker-assisted selection improve the efficiency of "directed" animal breeding, without the controversy normally associated with GMOs. Gene cloning methods must also address species differences in the genetic code, the presence or absence of introns and post-translational modifications such as methylation. Pest Resistant Crops For years, the microbe Bacillus thuringiensis, which produces a protein toxic to insects, in particular the European corn borer, was used to dust crops. To eliminate the need for dusting, scientists first developed transgenic corn expressing Bt protein, followed by Bt potato and cotton. Bt protein is not toxic to humans, and transgenic crops make it easier for farmers to avoid costly infestations. In 1999 controversy emerged over Bt corn because of a study that suggested the pollen migrated onto milkweed where it killed monarch larvae that ate it. Subsequent studies demonstrated the risk to the larvae was very small and, in recent years, the controversy over Bt com has switched focus, to the topic of emerging insect resistance. Date: 2016-03-03; view: 1322 |