Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 46

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  genetic modification
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Genetically modified (GM) sugar beets offer several advantages for growers, food industry, consumers and for the agricultural environment. Transgenic beets tolerant to total herbicides (tHT) are discussed and their advantages, based on field experiments, are presented along with prospects, limits and putative risks.
The potential effect of genetic modification on nutritional properties of potatoes transformed to improve resistance to a necrotic strain of Potato virus Y was determined in a rat experiment. Autoclaved tubers from four transgenic lines were included to a diet in the amount of 40% and compared with the conventional cv. Irga. The experiment lasted 3 weeks and special attention was paid to nutritional properties of diets, caecal metabolism and serum indices. Genetic modification of potato had no negative effect on the chemical composition and nutritional properties of tubers, ecosystem of the caecum, activity of serum enzymes and non-specific defence mechanism of the rats. Obtained results indicate that transgenic potato with improved resistance to PVYN: line R1F (truncated gene coding for PVYN polymerase in sense orientation), R2P (truncated gene coding for PVYN polymerase in antisense orientation), and NTR1.16 (non-translated regions of PVYN genome in sense orientation) are substantial and nutritional equivalence to the non-transgenic cultivar. Tubers of transgenic line NTR2.27 (non-translated regions of PVYN genome in antisense orientation) increased the bulk of caecal digesta and the production of SCFA as compared to tubers of the conventional cultivar and the other transgenic clones. Taking into account some deviations, it seems reasonable to undertake a long-term feeding study to confirm the nutritional properties of tubers of transgenic lines.
Transformation techniques are making it possible to produce novel and unusual plant phenotypes. When considering the environmental impact of these, it is important to do so in the context of what is known about conventional plant breeding and the thousands of varieties that have been produced during this century and earlier. There has now been over ten years of experience of environmental impact assessment with transgenic plants, and research has enabled that assessment process to be better informed scientifically. There are, however, important challenges for the future. Fundamental changes in plant biology, including enhanced tolerance to stressful environments, may create a class of plants that are different from those that have been produced so far, and there may be lessons to be learnt from the experience worldwide of the release of exotic species into different countries. Scale-dependent effects of transgenic plants in agriculture can only effectively be measured by large scale production and monitoring. The monitoring process presents a number of challenges to provide oversight that is meaningful and helpful in assessing environmental impact. The international transboundary movement of transgenic plants is already a reality, and it is important that our environmental impact assessments take this possibility into account. This includes both intentional transboundary movement, through trade of commodity crops, but also unintentional transboundary movement, including the possibility of seeds being moved by animals, by transportation and by humans across the world. There are some major challenges in devising agricultural strategies for the transgenic crops that will become available in the future. The responsibility for developing agricultural strategy rests at a number of levels. To achieve this, it will be necessary to have effective dialogue between the regulatory authorities, the plant breeding and agrochemical industries, and the farming industry. There are already encouraging moves in this direction and hopefully this will continue.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.