Effect of different Fe(III) compounds on photosynthetic electron transport in spinach chloroplasts and on iron accumulation in maize plants |
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| Authors: | Katarína Kráľová Elena Masarovičová František Šeršeň Iveta Ondrejkovičová |
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| Institution: | (1) Institute of Chemistry, Faculty of Natural Sciences, Comenius University, SK-842 15 Bratislava, Slovakia;(2) Department of Inorganic Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, SK-812 37 Bratislava, Slovakia |
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| Abstract: | Synthesis and spectral characteristics of Fe(nia)3Cl3] and Fe(nia)3(H2O)2](ClO4)3 are described. The effect of these compounds as well as of FeCl3·6H2O on photosynthetic electron transport in spinach chloroplasts was investigated using EPR spectroscopy. It was found that
due to the interaction of these compounds with tyrosine radicals situated at the 161st position in D1 (TyrZ) and D2 (TyrD) proteins located at the donor side of photosystem (PS) II, electron transport between the photosynthetic centres PS II and
PS I was interrupted. In addition, the treatment with Fe(nia)3(H2O)2](ClO4)3 resulted in a release of Mn(II) from the oxygen evolving complex situated on the donor side of PS II. Moreover, the effect
of the Fe(III) compounds studied on some production characteristics of hydroponically cultivated maize plants and on Fe accumulation
in plant organs was investigated. In general, the production characteristic most inhibited by the presence of Fe(III) compounds
was the leaf dry mass and Fe(nia)3(H2O)2](ClO4)3 was found to be the most effective compound. The highest Fe amount was accumulated in the roots, and the leaves treated with
Fe(III) compounds contained more Fe than the stems. The treatment with FeCl3·6H2O caused the most effective translocation of Fe into the shoots. Comparing the effect of nicotinamide complexes, Fe(nia)3(H2O)2](ClO4)3 was found to facilitate the translocation of Fe into the shoots more effectively than Fe(nia)3Cl3]. This could be connected with the different structure of these complexes. Fe(nia)3(H2O)2](ClO4)3 has ionic structure and, in addition, coordinated H2O molecules can be easily substituted by other ligands.
Dedicated to Professor Milan Melník on the occasion of his 70th birthday. |
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| Keywords: | EPR spectroscopy translocation iron-nicotinamide complexes maize plants bioaccumulation |
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