【摘要】 低浓度硒促进番茄(Lycopersicon esculentum Mill.)幼苗生长,高浓度硒则抑制生长,浓渡愈高对生长的抑制作用愈强。硒可被根很快地吸收,并运输至植株其它各器官,其吸收、运转的总量随吸收时间的延长而逐渐增加。植株总硒量在各部位的分布顺序为根>叶>茎。而在叶子中的分布则是自下而上递增。开花结实期植株各部位的积累顺序为根>果实>花>茎>叶。植株中的硒仅一部分仍以无机硒状态存在,大部分都转化成有机硒化物,并以蛋白硒为主。尤其是果实中蛋白硒占有机硒的比例比其它器官高,达90.89%。硫饥饿促进番茄根对硒的吸收和运输,增加硒在叶中的分布以及在根、茎和果实中有机硒含量。更多还原

【Abstract】 Low concentration of selenium enhanced, but high concentration inhibited the growth of tomato seedlings,the higher the concentration of selenium, the more the inhibition of the growth was. Selenium was absorbed quickly by roots, and conveyed to the other organs. With prolonged time, the degree of increase in the distribution of total selenium content in the plants was in the orders of roots>leaves>stems. From lower to upper the distribution of selenium in the leaves increased progressively. At the flowering and bearing stage, the orders of selenium distribution were roots>fruits>stems>leaves. Only a part of selenium in the plants existed at the state of inorganic selenium, and most changed into organic selenium,and the majority of it was in the form of selenoproteins. 90.89% of its selenoproteins was found in the fruits which was more than that of the other organs of plants. Sulfur starvation enhenced the absorption and um from roots,accelerated the distribution of selenium in the leaves,and lenium content in the roots, stems and fruits. transportation of seleniincreased the organic se-更多还原