摘要: The uptake of ions by plant roots involves a series events. First all, the root must intercept ions. This is matter both moving towards and overall process commonly aided fungal associations that increase effective radius roots. Ions then be taken up transported radially inwards one or more number available pathways Finally, those destined for shoots enter tissues have evolved long distance, high speed transport. To do this to cross barrier whose functions are impose selectivity on constituents external solution entering prevent concentrated in transport system from leaking out.