Photosynthetica 2001, 39(2):269-274 | DOI: 10.1023/A:1013701224847

Enhanced Thermal Energy Dissipation Depending on Xanthophyll Cycle and D1 Protein Turnover in Iron-Deficient Maize Leaves Under High Irradiance

Chuang-Dao Jiang1, Hui-Yuan Gao1, Qi Zou1
1 Department of Plant Science, Shandong Agricultural University, Tai'an, Shandong, P.R. China

Pigment contents of chloroplasts and net photosynthetic rate were dramatically reduced in maize leaves suffering from iron deficiency. However, the reduction in photosynthesis was probably not caused by decreased contents of chlorophylls and carotenoids and by photon absorption; the primary limiting factor for photosynthesis may rather be the decrease of electron transport activity in photosystem 1. Iron-deficient leaves suffered serious acceptor-side photoinhibition, and more than 60 % of absorbed photons were dissipated, while less than 40 % was used in photochemical reaction. Thermal energy dissipation depending on xanthophyll cycle and D1 protein turnover was enhanced when acceptor-side photoinhibition occurred in iron-deficient maize leaves.

Additional key words: carboxylation efficiency; carotenoids; chlorophyll; CO2 concentration; fluorescence kinetics; energy dissipation; net photosynthetic rate; photosystems; Zea mays

Published: June 1, 2001  Show citation

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Jiang, C., Gao, H., & Zou, Q. (2001). Enhanced Thermal Energy Dissipation Depending on Xanthophyll Cycle and D1 Protein Turnover in Iron-Deficient Maize Leaves Under High Irradiance. Photosynthetica, 39(2), 269-274. doi: 10.1023/A:1013701224847
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