A new strategy that offers a approach for the elimination of those disadvantages caused by the selectable marker gene is developed. 为了消除这些弊端，一种全新的发展策略即获取无选择标记的转基因植物应运而生。
One is the utilization of bio-safe positive selective markers which are genes mainly related to metabolism of auxins and carbohydrates. 一是选用安全的正向选择标记，主要是与糖代谢和激素代谢相关的基因。
