Modeling the Gene Flow of Genetically Modified Crops: A Case Study on Paddy Rice
Date Issued
2010
Date
2010
Author(s)
Wang, I-Chieh
Abstract
Since the first success in 1973, genetic engineering has kept catching people concern no matter in the science or social issues. And because of the success in genetic modified tobacco in 1984, agriculture had steped in the region of genetic modified. Although there’re advantages in genetic engineering, it also has some risks that we cannot ignore such as gene flow. Thus, governments have setted different regular with repect to genetic modified crops planting. The main countries decided to set the isolation distance or/and the GM threshold. However, there’s no sufficient scientific evidence had provided to explain their setting standards. According to this, our study established a model of gene flow analysis on genetically modified rice, in order to provide the government some information on the GMO-about law setting process. To establish the gene flow database of paddy rice, our study first collected field trials data from literatures, then using different models to find out the relationship between gene flow and isolation distances under different variable sets. Base on the results, the double-log type had the best ability in explaning the relation between gene flow and isolation distances. Further, we used the results to discuss the range of gene flow under different coefficients of isolation distances and standard errors. To including the weather factor, such as windspeed, wind direction, and atmospheric stability, etc., we established the pollen dispersion model of paddy rice based on Gaussian Plume Model (GPM) made the gene flow issue extend to the pollen dispersion level. In the simulating process, we found that the assumption used before had a huge mistake. Thus, our study corrected the assumption used before according to the paddy rice’s biological characters. The result proves that the issue of pollen dispersion is important for the issue of gene flow. Further, if we use the iso-density curves from the simulation results, we can make a more effective, land-saving and cost-saving isolation region.
Subjects
genetically modified crops
gene flow, paddy rice
pollen dispersion
Gaussian plume model (GPM)
isolation distances
Type
thesis
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