Cellular and molecular mechanisms underlying single-cell C4 photosynthesis in chenopodiaceae species

藜科单细胞 C4 光合作用的细胞和分子机制

• 批准号: 342747-2007
• 负责人: Chuong, Simon
• 金额: $ 2.77万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=482506
• 关键词: Cellular; molecular; mechanisms; underlying; single

All photosynthetic organisms perform a common biological process referred to as photosynthesis to convert atmospheric CO2 into organic products essential for all other forms of life. In terrestrial plants, three common modes of photosynthesis, C3, C4 and Crassulacean acid metabolism, have been identified with C4 plants being the most efficient under CO2 limiting conditions. It has long been accepted that the operation of C4 photosynthesis requires cooperation of two photosynthetic cell types called Kranz anatomy, which differ in ultrastructure and biochemistry. This paradigm was recently broken with the discovery that three members of the family Chenopodiaceae conduct C4 photosynthesis within individual cells. These species achieve novel solutions for the operation of the C4 photosynthetic mechanism within a single cell through spatial partitioning of organelles and photosynthetic enzymes into two subcellular domains. Therefore, these unique species provide ideal model systems with which to probe regulation of complex structural and functional polarity in a single plant cell.

所有光合生物都会执行一个称为光合作用的常见生物过程，将大气中的二氧化碳转化为所有其他生命形式所必需的有机产品。在陆地植物中，已确定三种常见的光合作用模式：C3、C4 和景天酸代谢，其中 C4 植物在 CO2 限制条件下效率最高。人们长期以来一直认为，C4 光合作用的运行需要两种称为 Kranz 解剖学的光合细胞类型的合作，这两种细胞在超微结构和生物化学方面有所不同。最近发现藜科的三个成员在单个细胞内进行 C4 光合作用，这一范式被打破。这些物种通过将细胞器和光合酶空间划分为两个亚细胞域，为单细胞内 C4 光合作用机制的运行提供了新的解决方案。因此，这些独特的物种提供了理想的模型系统，可用于探测单个植物细胞中复杂结构和功能极性的调节。