Bt technology -the way forward
- Fernando Valicente1
© Valicente; licensee BioMed Central Ltd. 2014
Published: 1 October 2014
Bt genes currently deployed in transgenic crops in Brazil
Cry2Ab,1Ab, 1A.105 (1Ab, 1Ac, 1F),Cry3Bb, 1F, VIP3Aa
Cry2Ab,1Ab,2Ae, Cry1Ac, 1F
Abroad proteins Cry34 and 35 have been used in transgenic crops. Despite the great number of Cry proteins described and more than 600 genes from cry1Aa1 to cry72, not many different proteins have been cloned in crops nowadays. There are many different perspectives in Bt technology in Brazil besides the use in programs of transgenic crops. The demand for the use of Bt based biopesticides has increased in many Brazilian regions. Some important factors have contributed as the introduction of the new pest Helicoverpa armigera that has attacked crops such as maize, cotton, soybean, millet, sorghum, beans, green peppers, tomato, okra etc. Another important factor is because of "safrinha". Due to a favorable climate, crops are planted all over the year, and the farmers plant a second crop of corn or cotton called the safrinha. This new scheme of crop rotation is to first plant a crop of rain-fed such as rice, soybean or maize, and then after these crops are harvested, plant a second crop of soybean, sorghum or even maize. Safrinha can also be defined as a farming strategy whereby the farmer takes advantage of a long tropical growing season to produce two crops in a single growing season, thereby maximizing revenue per acre. So, it is paramount to continue the research on Bt to find new and more efficient genes, and produce Bt based biopesticides feasible and cheap to the market.
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