农业用水约占人类用水总量的70%，是粮食生产中的重要要素。气孔作为植物用来与外界交换气体和水分的重要器官，与作物光合作用和水分利用效率密切相关。气孔保卫细胞与副保卫细胞的跨膜运输调节着大麦气孔开闭，直接影响着作物水分利用效率。然而到目前为止，对于大麦保卫细胞与副保卫细胞离子运输网络是如何影响作物气孔行为和水分利用效率的机制尚不清楚。定量系统的分析方法为探索微观离子运输与宏观气孔生理活动之间的联系提供了一种有效的研究手段。因此，申请人拟在双子叶模型平台基础之上，通过引入保卫细胞与副保卫细胞之间离子交换机制，建立新颖的大麦气孔保卫细胞与副保卫细胞模型。借助模型的分析，本项目将深入研究大麦气孔行为以及其与水分利用效率的之间关系，并探索提高大麦水分利用效率的方法。

Agricultural water usage accounts for some 70% of all human water consumption. It is a key factor in crop production. As an important organ for the gaseous exchange and water loss, stoma is often considered to be related to crop’s photosynthesis and water use efficiency. Stomatal guard cell and subsidiary cell membrane transport is integral to controlling stomatal aperture，which directly affects the water use efficiency in barley. To date, however, it is still not clear how the ion transport network of guard cell and subsidiary cell affects the stomatal behavior and water use efficiency. Quantitative systems analysis offers an effective approach to exploring the link between microscopic ion transport and the macroscopic characteristics of stomatal physiology. Therefore, based on the original guard cell model platform, a novel barley stomatal model will be developed in this project by introducing the ion transport mechanism between guard cell and subsidiary cell. Employing the new model, this project will in-depth study the relationship of stomatal behavior and water use efficiency, and explore the potential ways to enhancing water use efficiency in barley.