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Photosynthetic rate at approximately ambient irradiance (A) as a function of intercellular carbon dioxide concentration (C i) in representative leaves of 2- and 5-year-old intermediate wheatgrass plants on 6 April (A; leaf temperature 13 ºC), 15 May (B; leaf temperature 18 ºC), and 20 November (C; leaf temperature 5 ºC). Data were taken from a 2015 study at the Kellogg Biological Station (Hickory Corners, MI).
