Iron deficiency stress induced morphological and physiological changes in root tips of sunflower

摘要: Typical morphological and physiological changes were observed in iron deficient sunflower (Helianthus annuus L. cv. Sobrid) roots. These changes, or so-called stress reactions, are exclusively confined to the root tips. included additional cell division rhizodermis layer enhanced formation of hairs, leading an increase diameter (“swollen tips”). correlated with such as increased release protons, accumulation phenols rhizodermis, ability roots reduce iron-III compounds (“reducing capacity”). A marked tips take up translocate occurred simultaneously these changes. There is good evidence that reflections effective regulatory mechanism for mobilization sparingly soluble rhizosphere uptake by plants.