Grasses have “respiratory pores” (called stomata) that open and close to regulate the uptake of carbon dioxide for photosynthesis on the one hand and water loss through transpiration on the other. Unlike many other plants, stomata in grasses form lateral “helper cells.” Thanks to these cells, the stomata of grasses can open and close more quickly, which optimizes plant-atmosphere gas exchange and thus saves water.
Click here for original story, Polarity proteins shape efficient ‘breathing’ pores in grasses
Source: Phys.org