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delayed fluorescence spectroscopy and mechanism of the 730 nm component of chloroplast

Optoelectronics Letters 2006年第2期2卷 158-162页

作者： WANG Cheng-long 1, XING Da2, FAN Duo-wang1, QIAN Long1, and LU Mai1 1. Key laboratory of Optoelectronic Technology and Intelligent Control,Education Ministry of China,Lanzhou Jiaotong Universi- ty,Lanzhou 730070,China 2. Institute of Laser Life Science,South China Normal University,Guangzhou 510631, China Lanzhou Jiaotong Univ Educ Minist China Key Lab Optoelect Technol & Intelligent Control Lanzhou 730070 Gansu Peoples R China South China Normal Univ Inst Laser Life Sci Guangzhou 510631 Guangdong Peoples R China

Charge recombination in reaction center (RC) of photosystem Ⅱ(PS Ⅱ)is regarded as the location of 685 nm delayed fluorescence (DF). The mechanism of 730 nm component appearing in the DF spectrum for chloroplast was studied by various spectral analysis methods. Experimental results of the DF spectrum at different chloroplast concentration show that the intensity of peaks at 685nm and 730 nm ascends with the chloroplast concentration increasing when the concentration is relatively low. When the concentration increases to the level of 7.8 μg/ml, a maximum intensity of the peak at 685 nm appears but the intensity of 730 nm peak still increases. The peak at 730 nm finally reaches a maximum intensity at the chloroplast concentration of 31.2 μg/ml while the intensity of the 685 nm peak has apparently fallen down. The results of absorption spectrum show that the ratios of A685 to A730 keep almost constant with the increasing of chloroplast concentration. Furthermore, the excitation spectrum for 730 nm fluorescence shows that the 685nm light has high excitation *** results indicate that the 730nm component of DF spectrum is the fluorescence of chlorophyll in PS Ⅰ RC excited by 685 nm DF. Meanwhile, this can be further verified by the invariability of DF spectrum at different delay time (1 second～9 seconds).

关键词： nm delayed fluorescence spectroscopy and mechanism of the 730 nm component of chloroplast

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