Photosynthetica 2002, 40(4):581-586 | DOI: 10.1023/A:1024360220925

Effects of High Temperature on Chlorophyll Fluorescence Induction and the Kinetics of Far Red Radiation-Induced relaxation of apparent F0 in maize leaves

Ming-Xian Jin1, De-Yao Li1, Hualing Mi1
1 Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China

Temperature dependence (25-50 °C) of chlorophyll (Chl) fluorescence induction, far-red radiation (FR)-induced relaxation of the post-irradiation transient increase in apparent F0, and the trans-thylakoid proton gradients (ΔpH) was examined in maize leaves. Temperatures above 30 °C caused an elevation of F0 level and an enhancement of F0 quenching during actinic irradiation. Millisecond delayed light emission (ms-DLE), which reflects the magnitude of ΔpH, decreased strikingly above 35 °C, and almost disappeared at 50 °C. It indicates that the heat-enhanced quenching of F0 under actinic irradiation could not be attributed mainly to the mechanism of ΔpH-dependent quenching. The relaxation of the post-irradiation transient increase in apparent F0 upon FR irradiation could be decomposed into two exponential components (τ1 = 0.7-1.8 s, τ2 = 2.0-9.9 s). Decay times of both components increased with temperature increasing from 25 to 40-45 °C. The bi-phasic kinetics of FR-induced relaxation of the post-irradiation transient increase in apparent F0 and its temperature dependence may be related to plastoquinone (PQ) compartmentation in the thylakoid membranes and its re-organisation at elevated temperature.

Additional key words: heat stress; Zea mays L

Published: December 1, 2002  Show citation

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Jin, M., Li, D., & Mi, H. (2002). Effects of High Temperature on Chlorophyll Fluorescence Induction and the Kinetics of Far Red Radiation-Induced relaxation of apparent F0 in maize leaves. Photosynthetica, 40(4), 581-586. doi: 10.1023/A:1024360220925
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