Physiological and photosynthetic response of the flag leaf of three wheat genotypes under long-term water deficit combined with high temperature and elevated CO2

Wheat is one of the main staple foods worldwide due to its nutritional value and high consumption by human population. However, its production is expected to decline because of the effect of global climate change. Together with the increase in atmospheric (CO2) and Earth's average surface temperature, there will be stronger and more frequent episodes of drought threating wheat productivity, especially in the Mediterranean zone. In this study, we aim to investigate the effect of water deficit on the physiological and photosynthetic response of the flag leaf of three different genoytypes of two wheat species (Triticum aestivum L. cv Gazul and CIMMYT-HTWSN 41 and Triticum durum L. cv. Regallo) grown under a controlled environment, in which CO2 was kept at 900 ppm and the daily and sesaonal temperature was 4ºC above the current average of Salamanca region