摘要 : 近日，国际植物学顶级期刊《plant Physiology》杂志上在线发表了中山大学生命科学学院王宏斌教授团队题为“Optimization of Light Harvesting Pigment Improves Photosynthetic Efficiency”的研究论文
王宏斌教授团队通过大规模筛选，鉴定到一个重要的光效调控基因HIGH PHOTOSYNTHETIC EFFICIENCY 1(HPE1)。研究发现HPE1基因编码一个新的叶绿体RNA剪接因子，其缺失改变了细胞核编码的叶绿素相关基因的表达，从而优化了捕光色素，最终增加了光捕获能力和光合作用量子产量，提高了实际光合作用效率。
optimization of Light Harvesting Pigment Improves Photosynthetic Efficiency
Maximizing light capture by light-harvesting pigment optimization represents an attractive but challenging strategy to improve photosynthetic efficiency. Here, we report that loss of a previously uncharacterized gene, HIGH PHOTOSYNTHETIC EFFICIENCY1 (HPE1), optimizes light-harvesting pigments, leading to improved photosynthetic efficiency and biomass production. Arabidopsis (Arabidopsis thaliana) hpe1 mutants show faster electron transport and increased contents of carbohydrates. HPE1 encodes a chloroplast protein containing an RNA recognition motif that directly associates with and regulates the splicing of target RNAs of plastid genes. HPE1 also interacts with other plastid RNA-splicing factors, including CAF1 and OTP51, which share common targets with HPE1. Deficiency of HPE1 alters the expression of nucleus-encoded chlorophyll-related genes, probably through plastid-to-nucleus signaling, causing decreased total content of chlorophyll (a+b) in a limited range but increased chlorophyll a/b ratio. Interestingly, this adjustment of light-harvesting pigment reduces antenna size, improves light capture, decreases energy loss, mitigates photodamage, and enhances photosynthetic quantum yield during photosynthesis. Our findings suggest a novel strategy to optimize light-harvesting pigments that improves photosynthetic efficiency and biomass production in higher plants.