摘要
植物组织中的13C/12C小于空气中的13C/12C,说明在光合过程中植物对13C和12C的分辨率不同。植物对13C和12C分辨率的差别主要是由于光合作用过程中CO2经气孔扩散分差和酶羧化过程引起的。理论上的分析和实际的研究都表明碳同位素分辨率与植物水分利用效率高度相关因而利用碳同位素分辨率来衡量植物水分利用效率必将有广阔的应用前景。本文概述了稳定碳同位素的基本理论,从植物结构性碳、分布、功能群和抗旱节水育种等几个不同方面对稳定碳同位素在植物水分利用效率研究中的应用进行了简要总结,并就存在的主要问题进行了讨论。
The isotopic ratio of ^13C to ^12C in plant tissue is less than this in the atmosphere, indicating that plants discriminate against ^13C during photosynthesis. Variation in discrimination against ^13C during photosynthesis is due to both stomatal diffusion limitations and enzymatic carboxylase processes. Theoretical and empirical studies have demonstrated that carbon isotope discrimination is highly correlated with plant water use efficiency, and it will have amplitude application prospects in measuring water use efficiency. In this paper were presented the theory of carbon isotope discrimination and its application in water use efficiency from the aspects of plant structural carbon, distribution, functional groups and breeding in drought resistance and water saving. We also discussed the potential problems of the technique in plant water use efficiency.
出处
《西北林学院学报》
CSCD
北大核心
2008年第1期54-58,共5页
Journal of Northwest Forestry University
基金
国家自然科学基金项目(30070637)
北京市科委项目“北京城市园林绿化耐旱、节水园林植物筛选和应用研究”(JD100220535)和森林培育与保护实验室“北京城市绿地水分经济生态的研究”
