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首页> 美国卫生研究院文献>Plant Physiology >Oxygen-18 Content of Atmospheric Oxygen Does Not Affect the Oxygen Isotope Relationship between Environmental Water and Cellulose in a Submerged Aquatic Plant Egeria densa Planch
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Oxygen-18 Content of Atmospheric Oxygen Does Not Affect the Oxygen Isotope Relationship between Environmental Water and Cellulose in a Submerged Aquatic Plant Egeria densa Planch

机译：淹没的水生植物Egeria densa Planch中大气中氧气的Oxy-18含量不会影响环境水与纤维素之间的氧同位素关系

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We determined that the oxygen isotopic composition of cellulose synthesized by a submerged plant, Egeria densa Planch., is related to the isotopic composition of environmental water by a linear function, δ18O cellulose = 0.48 δ18O water + 24.1%‰. The observation of a slope of less than 1 indicates that a portion of cellulose oxygen is derived from an isotopically constant source other than water. We tested whether this source might be molecular oxygen by growing plants in the presence of high concentrations of 18O in the form of O2 bubbled into the bottom of an aquarium. Cellulose synthesized during this experiment did not have significantly different oxygen isotope ratios than that synthesized by control plants exposed to O2 of normal 18O abundance. We propose that oxygen in organic matter recycled from senescent portions of the plant is incorporated into cellulose. Our findings indicate that paleoclimatic models linking the oxygen isotope composition of environmental water to cellulose from fossil plants will have to be modified to account for contributions of oxygen from this or other sources besides water.
机译：通过线性函数δ 18 O纤维素= 0.48δ 18 O水+ 24.1%‰。小于1的斜率的观察表明，一部分纤维素氧来自水以外的同位素恒定源。我们测试了在高浓度 18 O的存在下（通过以气泡形式冒充到水族馆底部的O2的形式）生长植物来确定这种来源是否为分子氧。在此实验中合成的纤维素与暴露于正常 18 O丰度的O2的对照植物合成的氧同位素比没有显着不同。我们建议将从植物衰老部分回收的有机物中的氧气掺入纤维素中。我们的发现表明，将环境水的氧同位素组成与化石植物的纤维素联系起来的古气候模型必须加以修改，以考虑到除水以外，该来源或其他来源的氧气的贡献。

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