Photosynthetica, 2003 (vol. 41), issue 2

Photosynthetica 2003, 41(2):267 | DOI: 10.1023/B:PHOT.0000011960.95482.91

Changes of Donor and Acceptor Side in Photosystem 2 Complex Induced by Iron Deficiency in Attached Soybean and Maize Leaves

Chuang-Dao Jiang1,2, Hui-Yuan Gao2, Qi Zou2
1 Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing, P.R. China
2 Department of Plant Science, Shandong Agricultural University, Tai'an, Shandong, P.R. China

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.

Keywords: chlorophyll fluorescence kinetics; Glycine max; photosynthesis; Zea mays

Published: June 1, 2003Show citation

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Jiang, C., Gao, H., & Zou, Q. (2003). Changes of Donor and Acceptor Side in Photosystem 2 Complex Induced by Iron Deficiency in Attached Soybean and Maize Leaves. Photosynthetica, 41(2), 267. doi: 10.1023/B:PHOT.0000011960.95482.91.
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