One of the most discussed risks with the cultivation of transgenic plants is the loss of control over the engineered genes and subsequent hybridisation with closely related species. For hybridisation to take place, pollen need not only be dispersed to recipient plants, but the pollen grains must also sire the ovules. When more pollen is deposited than the number of available ovules, pollen will compete for fertilisation and the pollen that have the highest siring ability will be selected by the recipient plant. Pollen tube growth rate is the most important factor that influences siring ability. In this study we investigate the possibility of hybrid formation between cultivated and
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