外源基因在转基因植物中的表达与稳定性

外源基因能否在转基因植物中稳定表达对转基因植物的应用前景有重要的影响。影响外源基因稳定表达的因素有多种，其中包括遗传和环境因素。在某些转基因植物中，外源基因表达是受发育调控，本文主要讨论了转基因沉默及发育时期和环境条件对源基因的表达及稳定性的影响，并进一步探讨了对策。

The Stability of the Expression of Foreign Genes in Transgenic Plants

Whether or not the foreign genes can be stably expressed in transgenic plants has a profound effect on the application prospects of the transgenic plants. There are many factors influencing the stability of the expression of the foreign genes including genetic and environmental factors. In some transgenic plants, the expression of foreign genes is developmentally regulated. In this article, the facts that the gene silencing, environmental factors and developmental stages affect the stability of the expression of the foreign genes in transgenic plants are mainly discussed. Furthermore, the strategies for improving the stability of the expression of transgenic plants are put forward.