We review the potential for related soya species to cross-pollinate in field and greenhouse conditions. Several local soybean cultivars were fertilized successfully by pollen from wild soya. However, when the GM soybean cv. Stine 2254 RR (GTS 40-3-2) was used as a pollen 'donor' and plants of Glycine soja were the pollen 'trap', no herbicide-resistant plants were obtained during two growing seasons. Thus, natural cross-pollination between plants of the soybean species would probably be extremely rare, with a frequency below the sensitivity of this experiment. More data are needed to evaluate fully the extent of transfer of herbicide tolerance genes from widespread cultivation of soybeans to wild soya that might occur in this region.
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