Dallam R D
Life Sci. 1987 Mar 23;40(12):1147-54. doi: 10.1016/0024-3205(87)90232-3.
Sulfur is the major component of polluted air in industrialized societies. Atmospheric sulfur is converted to sulfuric acid through a series of chemical reactions which can eventually reenter many ecosystems. When edible plants are grown in soils containing varying amounts of sulfate, the roots take up and transport inorganic sulfate to the stems and leaves. The sulfate taken up by the roots and the amount transported to the stem and leaves was found to be a function of the concentration of sulfate in the soil. Inorganic sulfate taken up by a corn plant seedling can be rapidly converted to organic sulfate by the root system. Nine days after one of a pair of pea plants was inoculated with artificial acid rain sulfate (dilute H2 35SO4) it was found that the sulfate was translocated not only in the inoculated plant, but also to the uninoculated pea plant in the same container. Also, when the leaves of a mature potato plant were inoculated with artificial acid rain sulfate it was found that the sulfate was translocated into the edible potatoes. Fractionation of the potatoes showed that most of the sulfate was water soluble of which 30% was inorganic sulfate and 70% was in the form of organic sulfur. One third of the non-water soluble translocated acid rain sulfate was equally divided between lipid and non-lipid organic sulfur of the potato.
在工业化社会中，硫是污染空气的主要成分。大气中的硫通过一系列化学反应转化为硫酸，最终可能重新进入许多生态系统。当可食用植物种植在含有不同量硫酸盐的土壤中时，根系会吸收无机硫酸盐并将其运输到茎和叶中。研究发现，根系吸收的硫酸盐以及运输到茎和叶中的量是土壤中硫酸盐浓度的函数。玉米幼苗吸收的无机硫酸盐可被根系迅速转化为有机硫酸盐。在用人工酸雨硫酸盐（稀H₂³⁵SO₄）接种一对豌豆植株中的一株九天后，发现硫酸盐不仅在接种的植株中发生了转运，而且还转运到了同一容器中未接种的豌豆植株中。此外，当给成熟马铃薯植株的叶片接种人工酸雨硫酸盐时，发现硫酸盐被转运到了可食用的马铃薯中。对马铃薯进行分级分离表明，大部分硫酸盐是水溶性的，其中30%是无机硫酸盐，70%是以有机硫的形式存在。非水溶性转运的酸雨硫酸盐的三分之一在马铃薯的脂质和非脂质有机硫之间平均分配。
