玉米、小麦细胞磷、锌营养及交互作用的研究

采用溶液培养研究玉米、小麦在不同磷、锌浓度下细胞磷、锌营养及交互作用。结果表明，随着外界磷浓度（０，０．１２，０．６，３．０ｍｍｏｌ／Ｌ）的提高，玉米、小麦根系和叶片细胞壁、细胞质和液泡中磷含量也随之增高，但细胞壁和液泡中磷的含量高于细胞质中的含量。介质中磷浓度的提高使根细胞壁中锌的含量增加，但高磷（３．０ｍｍｏｌ／Ｌ）处理使细胞质、液泡中锌的含量下降。高磷处理抑制了两种作物的锌由根系向地上部的转运，同时叶片中大部分锌被结合在细胞壁中，因而叶细胞中的细胞质和液泡处于相对的低锌状态。与足量锌（２．０ｍｏｌ／Ｌ）供应比较，低锌（０．１ｍｏｌ／Ｌ）处理使玉米、小麦根系和叶细胞壁、细胞质和液泡中磷的浓度增高。低锌和过量磷的供给抑制了植株的生长，最终使干物质的积累下降。

STUDY ON THE CELL NUTRITION OF PHOSPHORUS AND ZINC INTERACTION IN CORN AND WHEAT

The cellular nutrition of phosphorus and zinc and their interaction in corn and wheat under the varied phosphorus and zinc were investigated in solution culture. The results showed that the increased phosphorus content of cell walls, cytoplasm and vacuoles in both leaved and roots of corn and wheat were observed with the increasing phosphorus supply (0, 0.12, 0.6, 3.0 mmol/L) in the medium. However, the content of phosphorus in the cell wall was higher than that in the cytoplasm. The enhanced phosphorus in the culture solution increased the content of zinc in the root cell wall, but the treatment of 3 mmol/L P made the zinc content in cytoplasm and vacuoles decreased. High treatment with phosphorus inhibited the zinc translocation from roots to shoots in both crops. In addition, as most of zinc in leaves was bound to in the cell wall, a relative low zinc contents in the leaf cytoplasm and vacuoles were expected compared to the treatment of rich zinc supply (2.0 mol/L) and decreased application of zinc (0.1 mol/L) increased the content of phosphorus in the leaf and root cell in corn and wheat. As a result, the stunted growth of both crops was attributed to the imbalance of low zinc and high phosphorus concentrations in the plants.