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• The development of crop varieties able to sustain or improve yields with less water input is, therefore, a priority for crop research. Almost all water used for plant growth is lost to the atmosphere by transpiration through stomatal pores on the leaf epidermis. By altering stomatal pore apertures, plants are able to optimize their CO2 uptake for p...
• Changes in climate are already negatively affecting the yields of staple crops in agricultural areas around the world
• Agriculture will need to adapt quickly to ensure that water is used more efficiently, while maintaining food security in a world where human population is rapidly growing
• Moreover, the development of crop varieties that have improved water-use efficiency (WUE) under predicted future climates will also be critica
• WUE is the amount of CO2 fixed in photosynthesis (A) relative to the amount of water vapor lost to the atmosphere

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