Billings W D, Godfrey P J
Science. 1967 Oct 6;158(3797):121-3. doi: 10.1126/science.158.3797.121.
The hollow stems of wet-meadow and bog plants often contain relatively large amounts of carbon dioxide. The internal carbon dioxide apparently originates from respiration of root and stem cells. Some of this carbon dioxide is fixed photosynthetically by stem tissues and is thus recycled within the plant. Such internal stem photosynthesis would be advantageous, particularly in the early stages of growth in cold, wet, high-altitude environments.
湿草甸和沼泽植物的中空茎干通常含有相对大量的二氧化碳。内部的二氧化碳显然源自根和茎细胞的呼吸作用。其中一些二氧化碳通过茎组织进行光合固定，从而在植物体内循环利用。这种茎内光合作用会很有好处，尤其是在寒冷、潮湿的高海拔环境中的生长初期。
