當基因改造(genetically modified, GM)作物與野生近緣種、栽培種與雜草發生雜交，可能會對自然環境與生物多様性造成很大的影響。水稻為世界上重要的作物之一，超過50%的世界人ロ以稻米為主食。目前有許多GM水稻成功被育成，例如耐除草劑、抗病、抗蟲、耐鹽、耐旱、高蛋白質含量、增加產量等特性。儘管水稻為自交作物，其GM基因仍會經由花粉流動而進行基因流動。本報告主要先探討影響水稻花粉式基因流動之因子，進一歩建立模式模擬GM水稻花粉飄散至non-GM水稻之情況，以預測花粉飄散之最大距離作為GM水稻與non-GM水稻共存之依據。

When genetically modified (GM) crops cross with cultivars, wild relatives, and weeds, great impacts on natural environment and biodiversity may arise. Rice is one of the most important crops in the world, providing a staple food for over half of the global population. There are many GM rice have been successfully bred, such as herbicide tolerance, disease resistance, insect resistance, salt tolerance, drought tolerance, high protein content, and high yield. Although rice is a self-pollinated crop, its transgenes can
result in gene flow through the pollen flow. In this review paper, we discuss the factors of pollen-mediated gene flow in rice, and introduce the model to simulate the dispersion of GM rice pollen to the non-GM rice and the maximum distance of pollen flow can be predicted. The information can be the reference for coexistence between GM and non-GM rice.