142M471B3J 1 7440-44-0 1 9004-34-6 1 C4 plants 1 Carbon 1 Carbon Dioxide 1 Carbon Isotopes 1 mehr ... Carbon export Cellulose 1 Journal Article 1 Research Support, Non-U.S. Gov't 1 cellulose 1 photosynthesis 1 post-photosynthetic fractionation 1 respiration 1 sink–source relation 1 water use efficiency 1 weniger ...