Journal Article 142M471B3J Carbon Dioxide Research Support, Non-U.S. Gov't net CO2 assimilation rate (A) photosynthesis stomatal conductance (gs) stomatal density Bread wheat Gases Kinetics MAGIC Tomatoes Triticum aestivum L Triticum turgidum ssp. dicoccoides Triticum turgidum ssp. dicoccon) bean (Phaseolus vulgaris L.) bread wheat (Triticum aestivum L.) crop productivity grafting natural variation photosynthetic capacity split-chamber cuvette stomata stomatal conductance thermal images water use efficiency wheat wheat relatives (Aegilops tauschii