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C3/C4 中间产物和杂种在panicum 中的补偿点和同位素特征。

Compensation point and isotopic characteristics of c(3)/c(4) intermediates and hybrids in panicum.

机构信息

Department of Earth and Space Sciences and Archeology Program, University of California, Los Angeles, California 90024.

出版信息

Plant Physiol. 1986 Jan;80(1):242-5. doi: 10.1104/pp.80.1.242.

DOI:10.1104/pp.80.1.242

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC1075089/

Abstract

Leaf CO(2) compensation points and stable hydrogen, oxygen and carbon isotope ratios were determined for Panicum species including C(3)/C(4) intermediate photosynthesis plants, hybrids between C(3)/C(4) intermediates and C(3) plants, C(3) and C(4) plants in the Panicum genus as well as several other C(3) and C(4) plants. C(3) plants had the highest compensation points, followed by hybrids, C(3)/C(4) intermediates, and C(4) plants. delta(13)C values of cellulose nitrate and saponifiable lipids from C(4) plants were about 10 per thousand higher than those observed for cellulose nitrate and saponifiable lipids of C(3)/C(4) intermediates, hybrids, and C(3) plants. Oxygen isotope ratios of cellulose as well as those of leaf water were similar for all plants. There was substantial variability in the deltaD values of cellulose nitrate among the plants studied. In contrast, such variability was not observed in deltaD values of water distilled from the leaves, nor in the deltaD values of the saponifiable lipids. Variability in deltaD values of cellulose nitrate from C(3)/C(4) intermediates, hybrids, C(3), and C(4) plants is due to fractionations occurring during biochemical reactions specific to leaf carbohydrate metabolism.

摘要

测定了包括 C3/C4 中间光合作用植物、C3/C4 中间植物与 C3 植物杂交种、Panicum 属的 C3 和 C4 植物以及其他几种 C3 和 C4 植物的叶片 CO2 补偿点和稳定的氢、氧和碳同位素比值。C3 植物的补偿点最高，其次是杂交种、C3/C4 中间植物和 C4 植物。C4 植物的纤维素硝酸盐和可皂化脂质的 δ13C 值比 C3/C4 中间植物、杂交种和 C3 植物的纤维素硝酸盐和可皂化脂质高约 10‰。所有植物的纤维素和叶片水的氧同位素比值相似。在所研究的植物中，纤维素硝酸盐的 δD 值存在很大的可变性。相比之下，从叶片中蒸馏出来的水的 δD 值以及可皂化脂质的 δD 值并没有观察到这种可变性。C3/C4 中间植物、杂交种、C3 和 C4 植物的纤维素硝酸盐的 δD 值的可变性是由于叶片碳水化合物代谢特定的生化反应中发生的分馏作用造成的。