Analysis of Natural Abundance of Isotopes Emitted from Plants in Relation to Carbon and Nitrogen Utilization

点击翻译按钮获取中文摘要

The carbon isotope composition(d13C) of CO2 respired by excised organs of rice and maize was measured under dark condition. In rice plants a significant difference in d13C signature of CO2 was found ; the d13C was higher in the roots than other organs(the shoot in vegetative stage and the mature leaves and ears in reproductive stage). In contrast maize showed no significant difference in d13C signature among organs in both vegetative and reproductive stages. These suggest that substrate pools utilized for respiration can be different among organs in rice plants as compared with maize.