红移叶绿素将植物光合作用可利用的太阳光谱扩展至远红光区，对缺乏可见光环境中的植物生存至关重要，可望在提高光能利用效率领域有广泛应用。但是红移叶绿素仅被国际同行在少数几株蓝藻中发现，红移叶绿素蓝藻适应远红光的机制也亟待研究。申请人前期在华中地区亚热带常绿阔叶林生态系统中分离了三株红移叶绿素蓝藻，并发现它们具有不同的远红光适应策略。在此基础上，该项目拟进一步分离我国主要森林生态系统中的红移叶绿素蓝藻类群，揭示其在我国不同森林类型中的分布规律；通过吸收光谱分析、荧光光谱分析、色素鉴定和蛋白鉴定，揭示其光合机构吸收和传递远红光的生理生化机制；通过比较基因组和基因表达分析，揭示其光合机构组分相关基因的遗传和进化特征。该项目研究将填补我国红移叶绿素蓝藻资源研究的空白，阐释红移叶绿素蓝藻对远红光的适应机制，为提高大田农作物冠层下部的光合作用效率提供基因资源和改造策略。

The red-shifted chlorophlls can expand the solar spectrum to far-red light region for photosynthesis, which are necessary for plant growth in the areas with deprived visible light, and will be very useful to increase solar energy utilization efficiency in the future. However, the red-shifted chlorophlls were only found in a few cyanobacteria abroad, and the mechanisms of far-red light adaptation remained to be resolved in these special cyanobacteria. In previous work, we unexpectedly found red-shifted chlorophylls producing cyanobacteria with various far-red light adaptation strategies in a Huazhong subtropical evergreen forest. In the proposal, firstly, more red-shifted chlorophlls containing cyanobacteria will be isolated, and their ecological distribution will be then analyzed in the main Chinese forest zones. Secondly, the experiments of adsorption spectra, fluorescence spectra, pigments detection, protein identification and so on are conducted, in order to study the physiological and biochemical mechanisms of far-red light adaption for photosynthetic apparatuses in these special cyanobacteria. Finally, genetic basis of far-red light adaptation for photosynthetic apparatuses are scheduled by study of the genomic comparisons and gene expression in these special cyanobacteria. This project will fill the research gaps on the red-shifted containing cyanobacteria in our country, and help to elucidate the mechanisms of photosynthetic apparatuses to adapt far-red light in cyanobacteria. The knowledge from the research can benefit photosynthetic efficiency in the lower canopy of field crops in the future.