Deniro M J, Epstein S
Science. 1979 Apr 6;204(4388):51-3. doi: 10.1126/science.204.4388.51.
The ratios of oxygen-18 to oxygen-16 ( (18)O/(16)O) of cellulose purified from two sets of wheat plants grown under conditions similar in all respects except for a large difference in the (18)O/(16)O ratios of the carbon dioxide supplied to them differ by only a small amount. The difference in the (18)O/(16)O ratios of the cellulose is similar to that observed for the (18)O/(16)O ratios of the water present in the plants. These results indicate that the oxygen derived from carbon dioxide undergoes complete exchange with the oxygen of the water in the plant during the synthesis of cellulose and that the (18)O/(16)O ratio of the water inside the plant is the primary influence on the (18)O/(16)O ratio of cellulose in terrestrial plants.
从两组小麦植株中纯化得到的纤维素，其氧-18与氧-16的比率（(¹⁸)O/(¹⁶)O）相差很小。这两组小麦植株生长条件在各方面都相似，只是供应给它们的二氧化碳的(¹⁸)O/(¹⁶)O比率存在很大差异。纤维素的(¹⁸)O/(¹⁶)O比率差异与植株中水分的(¹⁸)O/(¹⁶)O比率差异相似。这些结果表明，在纤维素合成过程中，来自二氧化碳的氧与植株中的水的氧发生了完全交换，并且植株内水分的(¹⁸)O/(¹⁶)O比率是陆地植物中纤维素(¹⁸)O/(¹⁶)O比率的主要影响因素。
