Karley A J, Leigh R A, Sanders D
Dept of Biology, University of York, PO Box 373, York, UK YO10 5YW.
Trends Plant Sci. 2000 Nov;5(11):465-70. doi: 10.1016/s1360-1385(00)01758-1.
Leaf cells accumulate solutes differently depending on their cell type. The accumulation profiles of inorganic ions have been well documented for the mesophyll and epidermis, particularly in cereals. These cell types accumulate ions such as phosphate and calcium to strikingly different extents. Understanding the processes that control ion accumulation could reveal how plants respond to either a limiting supply of important micro- and macronutrient ions or to potentially toxic loads of salts or heavy metal ions. Research has recently begun to reveal the processes that underlie this remarkable sorting of nutrient ions within the leaf.
叶片细胞根据其细胞类型不同而以不同方式积累溶质。对于叶肉和表皮细胞，尤其是在谷类作物中，无机离子的积累情况已有充分记录。这些细胞类型在积累诸如磷酸盐和钙等离子时，程度差异显著。了解控制离子积累的过程，可能会揭示植物如何应对重要微量和大量营养离子的供应受限情况，或潜在的有毒盐分或重金属离子负荷。最近的研究已开始揭示叶片内营养离子这种显著分类背后的过程。
