FINE REGULATION OF IRON UPTAKE BY THE Fe-EFFICIENT PLANT HELIANTHUS ANNUUS

摘要: Summary Differences in susceptibility of plant species to iron chlorosis are well known. Under stress sunflower ( Helianthus annuus L.), as an Fe-efficient species, rapidly increases the reducing capacity on root surface and lowers pH nutrient solution (substrate). Simultaneously rate uptake translocation up 100-fold. Morphological changes roots also occur under deficiency. The growth main is stunted many lateral appear just behind tip. tips swollen result enlarged cortex cells additional cell division rhizodermis cells. Each peripheral layer this tip region has developed a long hair. Results presented which show that exclusively responsible for reactions. Even before symptoms visible, respond insufficient supply, i.e. latent morphology physiology plants periodically expression very effective mechanism fine regulation uptake. It can be assumed plays important role mobilization rhizosphere especially soils with high values.