Walters R G, Horton P
Robert Hill Institute, Department of Molecular Biology and Biotechnology, University of Sheffield, UK.
Planta. 1995;197(2):306-12. doi: 10.1007/BF00202652.
Arabidopsis thaliana (L.) Heynh. cv. Landsberg erecta was grown under light regimes of differing spectral qualities, which results in differences in the stoichiometries of the two photosynthetic reaction centres. The acclimative value of these changes was investigated by assessing photosynthetic function in these plants when exposed to two spectrally distinct actinic lights. Plants grown in an environment enriched in far-red light were better able to make efficient use of non-saturating levels of actinic light enriched in long-wavelength red light. Simultaneous measurements of chlorophyll fluorescence and absorption changes at 820 nm indicated that differences between plants grown under alternative light regimes can be ascribed to imbalances in excitation of photosystems I and II (PSI, PSII). Measurements of chlorophyll fluorescence emission and excitation spectra at 77 K provided strong evidence that there was little or no difference in the composition or function of PSI or PSII between the two sets of plants, implying that changes in photosynthetic stoichiometry are primarily responsible for the observed differences in photosynthetic function.
拟南芥（Arabidopsis thaliana (L.) Heynh.）生态型兰茨贝格直立型在不同光谱质量的光照条件下生长，这导致了两个光合反应中心化学计量的差异。通过评估这些植物在暴露于两种光谱不同的光化光时的光合功能，研究了这些变化的适应性价值。在富含远红光的环境中生长的植物能够更好地有效利用富含长波长红光的非饱和水平光化光。同时测量叶绿素荧光和820 nm处的吸收变化表明，在不同光照条件下生长的植物之间的差异可归因于光系统I和II（PSI、PSII）激发的不平衡。在77 K下测量叶绿素荧光发射和激发光谱提供了有力证据，表明两组植物之间PSI或PSII的组成或功能几乎没有差异，这意味着光合化学计量的变化是观察到的光合功能差异的主要原因。
