Langdale J A, Nelson T
Plant Sciences Department, University of Oxford, UK.
Trends Genet. 1991 Jun;7(6):191-6. doi: 10.1016/0168-9525(91)90435-s.
Leaf development in C4 plants requires the morphological and functional differentiation of two photosynthetic cell types (bundle sheath and mesophyll). Photosynthetic reactions are split between bundle sheath and mesophyll cells, with each cell type accumulating a specific complement of photosynthetic enzymes. Current evidence suggests that in order to activate this cell-specific expression of photosynthetic genes, bundle sheath and mesophyll cells must interpret positional information distributed locally around each vein.
C4植物的叶片发育需要两种光合细胞类型（维管束鞘细胞和叶肉细胞）在形态和功能上进行分化。光合反应在维管束鞘细胞和叶肉细胞之间进行分工，每种细胞类型积累特定的光合酶组合。目前的证据表明，为了激活光合基因的这种细胞特异性表达，维管束鞘细胞和叶肉细胞必须解读在每条叶脉周围局部分布的位置信息。
