Changes of Donor and Acceptor Side in Photosystem 2 Complex Induced by Iron Deficiency in Attached Soybean and Maize Leaves |
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Authors: | Jiang Chuang-Dao Gao Hui-Yuan Zou Qi |
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Institution: | (1) Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, P.R. China;(2) Department of Plant Science, Shandong Agricultural University, Tai'an, Shandong, 271018, P.R. China |
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Abstract: | Photosynthesis in iron-deficient soybean and maize leaves decreased drastically. The quantum yield of photosystem 2 (PS2)
electron transport (ΦPS2), the efficiency of excitation energy capture by open PS2 reaction centres (Fv′/Fm′), and photochemical quenching coefficient (qP) under high irradiance were lowered significantly by iron deficiency, but non-photochemical quenching (NPQ) increased markedly.
The analysis of the polyphasic rise of fluorescence transient showed that iron depletion induced a pronounced K step both
in soybean and maize leaves. The maximal quantum yield of PS2 photochemistry (Φpo) decreased only slightly, however, the efficiency with which a trapped exciton can move an electron into the electron transport
chain further than QA (Ψ0) and the quantum yield of electron transport beyond QA (ΨEo) in iron deficient leaves decreased more significantly compared with that in control. Thus not only the donor side but also
the acceptor of PS2 was probably damaged in iron deficient soybean and maize leaves.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | chlorophyll fluorescence kinetics Glycine max photosynthesis Zea mays |
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