Université de Franche-Comté, CNRS, UMR 6249, Chrono-environnement, BP 71427, F-25211 Montbéliard Cedex, France.
Environ Pollut. 2011 Oct;159(10):2759-65. doi: 10.1016/j.envpol.2011.05.015. Epub 2011 Jun 8.
The influence of atmospheric phenanthrene (PHE) exposure (160 μg m(-3)) during one month on carbon allocation in clover was investigated by integrative (plant growth analysis) and instantaneous (13)CO(2) pulse-labelling approaches. PHE exposure diminished plant growth parameters (relative growth rate and net assimilation rate) and disturbed photosynthesis (carbon assimilation rate and chlorophyll content), leading to a 25% decrease in clover biomass. The root-shoot ratio was significantly enhanced (from 0.32 to 0.44). Photosynthates were identically allocated to leaves while less allocated to stems and roots. PHE exposure had a significant overall effect on the (13)C partitioning among clover organs as more carbon was retained in leaves at the expense of roots and stems. The findings indicate that PHE decreases root exudation or transfer to symbionts and in leaves, retains carbon in a non-structural form diverting photosynthates away from growth and respiration (emergence of an additional C loss process).
研究了一个月大气中菲（PHE）暴露（160μg m（-3））对三叶草碳分配的影响，采用综合（植物生长分析）和瞬时（13）CO（2）脉冲标记方法。PHE 暴露降低了植物生长参数（相对生长率和净同化率），扰乱了光合作用（碳同化率和叶绿素含量），导致三叶草生物量减少 25%。根冠比显著提高（从 0.32 提高到 0.44）。光合作用产物相同地分配到叶片，而分配到茎和根的比例减少。PHE 暴露对三叶草器官之间的（13）C 分配有显著的总体影响，因为叶片中保留了更多的碳，而根和茎中的碳减少。研究结果表明，PHE 减少了根分泌物或向共生体的转移，而在叶片中，将碳以非结构性形式保留，将光合作用产物从生长和呼吸中转移（出现额外的碳损失过程）。
