To some extent, differential zinc (Zn) efficiency of cereals, particularly differences between species may be attributed to phytosiderophores (PSs) release and inorganic Zn (Zn2+) uptake; however, the discrepancies within a given species are still under discussion. Moreover, studies on the explanations of differential Zn efficiencies of barleys are limited. That is why using two barley (Hordeum vulgare L.) cultivars (Zn-efficient, Tarm-92 and -inefficient, Hamidiye-79), two short-term uptake experiments were designed with two forms of Zn, free Zn (Zn2+) or PS chelated Zn (Zn-PS) labelled with radioactive Zn (65Zn) in nutrient solution culture. Similar to earlier studies, the Zn uptake by roots and its translocation to shoots of barley supplied as either free (Zn2+) or chelated (Zn-PS) was induced under Zn deficiency. Although according to results of previous works, a close relationship between Zn2+ uptake of roots and Zn efficiencies of the same barley cultivars might have existed, the outcomes of the present research showed the opposite. Neither the uptake of Zn2+ and Zn-PS from roots nor their translocation to shoot had any compatible connection with the Zn efficiencies of barley cultivars. So the reason for differential Zn efficiency within a given cereal species remained unclear including barley as well.
Key words: Barley, phytosiderophores, uptake, zinc, zinc efficiency.
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