College of Life Sciences, Nanjing Normal University, Nanjing, China.
J Exp Bot. 2018 Jun 27;69(15):3531-3540. doi: 10.1093/jxb/ery155.
In C4 plants, the vascularization of the leaf is extended to include a ring of photosynthetic bundle sheath cells, which have essential and specific functions. In contrast to the substantial knowledge of photosynthesis in C4 plants, relatively little is known about photosynthesis in C3 plant veins, which differs substantially from that in C3 mesophyll cells. In this review we highlight the specific photosynthetic machinery present in C3 vascular cells, which likely evolved prior to the divergence between C3 and C4 plants. The associated primary processes of carbon recapture, nitrogen transport, and antioxidant metabolism are discussed. This review of the basal C4 photosynthesis in C3 plants is significant in the context of promoting the potential for biotechnological development of C4-transgenic rice crops.
在 C4 植物中，叶片的脉管系统延伸到包括一个光合束鞘细胞的环，这些细胞具有重要和特定的功能。与 C4 植物光合作用的大量知识相比，相对较少的知识涉及 C3 植物叶脉中的光合作用，它与 C3 叶肉细胞中的光合作用有很大的不同。在这篇综述中，我们强调了存在于 C3 血管细胞中的特定光合作用机制，这些机制可能是在 C3 和 C4 植物分化之前进化而来的。讨论了与之相关的碳回收、氮运输和抗氧化代谢的主要过程。在促进 C4 转基因水稻作物生物技术发展的背景下，对 C3 植物基础 C4 光合作用的综述具有重要意义。
