Localization of phytosiderophore release and of iron uptake along intact barley roots

摘要: Under iron deficiency the release of so-called phytosiderophores by roots barley plants (Hordeum vulgare L. cv. Europa) was greater a factor 10 to 50 compared iron-sufficient plants. This enhanced occurred particularly in apical zones seminal and lateral root zones. deficiency, uptake rates for iron, supplied as FeIII phytosiderophore, increased ca 5 rate also much more pronounced than basal In contrast, with supply synthetic chelate, FelII EDDHA (ferric diaminoethane-N, N-di-o-hydroxyphenyl acetic acid), Fe deficiency-enhanced were only small similar along roots, except The high selectivity translocation is reflected fact that, at same external concentration (2 μM), from between 100 (Fe-sufficient) 1 000 times higher (Fe-deficient plants) EDDHA. relatively zone formation strongly suggest an apoplastic pathway radial transport chelate into stele this zone. The results demonstrate that are main sites both phytosiderophores.