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Ultrafast spectroscopic studies on the isolated PSII particles from pseudo ginseng, water hyacinth and spinach leaves
Xu, SC; Ai, XC; Sun, ZY; Feng, J; Zhang, QY; Zhang, XK
2001
Source PublicationACTA CHIMICA SINICA
ISSN0567-7351
Volume59Issue:6Pages:937-944
AbstractWe have studied the spectroscopic characteristics and the fluorescence lifetime for the PS II particles from pseudo ginseng, water hyacinth and spinach plant leaves by absorption spectra, low temperature steady- state fluorescence spectroscopy and single photon counting measurement under the same conditions. The absorption spectra for the PS II particles at room temperature are similar, which suggests that different plants can efficiently absorb light of the same wavelength. The fluorescence decays in PS II measured at the natural QA state for the PS II particles have been fitted by a three - exponential kinetic model. The three fluorescence lifetimes are 14 ps, 272 ps and 1840 ps for the pseudo ginseng PS II particles; 157 ps, 415 ps and 1661 ps for the water hyacinth PS II particles; 198 ps, 677 ps and 1244 ps for the spinach PS II particles, respectively. The slow lifetime fluorescence component is assigned to a collection of associated light harvesting Chi a/b proteins, the fast lifetime component to the reaction center of PS II and the middle lifetime component to the delay fluorescence of recombination of P-680(+) and Pheo(-). The excited energy conversion efficiency (eta) in PS II RC is 41%, 89%, 91% calculated on the 20 ps model for the pseudo ginseng, water hyacinth and spinach PS II particles, respectively. This interesting result is not consistent with what is assumed that the efficiency is 100% in PS II RC. Our result in this paper also presents a support for the 20 ps electron transfer time constant in PS II being more reasonable. However, our results show those plants can perform highly efficient transfer of photo - excitation energy from the light - harvesting pigment system to the reaction center (near 100%). The results in this paper further demonstrate that the characteristics with slow growth for pseudo ginseng plant is discernible in the primary processes of photosynthesis, plant growth is related with its spectroscopic characteristics and the fluorescence lifetime, and the slower a plant grows the less excited energy efficiency used should be anticipated.
KeywordWater Hyacinth Pseudo Ginseng Psii Particle Single Photon Counting Fluorescence Lifetime Excited Energy Convertion Efficiency
Indexed BySCI
Language英语
WOS IDWOS:000169511700023
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/77612
Collection中国科学院化学研究所
Corresponding AuthorXu, SC
Affiliation1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, State Key Lab struct Chem Unstable & Stable Speci, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Inst Bot, Photosynth Res Ctr, Beijing 100093, Peoples R China
Recommended Citation
GB/T 7714
Xu, SC,Ai, XC,Sun, ZY,et al. Ultrafast spectroscopic studies on the isolated PSII particles from pseudo ginseng, water hyacinth and spinach leaves[J]. ACTA CHIMICA SINICA,2001,59(6):937-944.
APA Xu, SC,Ai, XC,Sun, ZY,Feng, J,Zhang, QY,&Zhang, XK.(2001).Ultrafast spectroscopic studies on the isolated PSII particles from pseudo ginseng, water hyacinth and spinach leaves.ACTA CHIMICA SINICA,59(6),937-944.
MLA Xu, SC,et al."Ultrafast spectroscopic studies on the isolated PSII particles from pseudo ginseng, water hyacinth and spinach leaves".ACTA CHIMICA SINICA 59.6(2001):937-944.
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