Abstract:
:We present the wavelength dependence of homogeneous holewidths of persistent spectral holes burnt in O2-evolving Photosystem II core complexes isolated from spinach, in the temperature range 2.5-8 K. The data supports the assignment that those chlorophylls which undergo persistent spectral hole-burning are specific CP43 and CP47-trap states that transfer their excitation energy to the reaction center. The lifetime-limited holewidths show that when PS II is in the S1(QA -) (closed) state, the CP43/CP47-trap states have excited-state lifetimes in the range from 70 to 270 ps. These lifetimes correspond to excitation transfer rates to the reaction center, and are far slower than required for models in which the PS II reaction center (P680) acts as a 'shallow-trap' for excitations. For wavelengths at which both traps absorb, the hole shape is clearly a composite of two Lorentzians, corresponding to hole-burning in both states simultaneously. The temperature dependence of the homogeneous holewidth does not follow the usual T1.3 dependence found in many chlorophyll-protein systems. Our data indicates T 2 temperature dependence, typically found in crystalline systems where the chromophore is coupled to localized phonon modes.
journal_name
Photosynth Resjournal_title
Photosynthesis researchauthors
Hughes JL,Krausz E,Smith PJ,Pace RJ,Riesen Hdoi
10.1007/s11120-004-7927-6subject
Has Abstractpub_date
2005-06-01 00:00:00pages
93-8issue
1-3eissn
0166-8595issn
1573-5079journal_volume
84pub_type
杂志文章abstract::Recycling of carbon by the photorespiratory pathway involves enzymatic steps in the chloroplast, mitochondria, and peroxisomes. Most of these reactions are essential for plants growing under ambient CO(2) concentrations. However, some disruptions of photorespiratory metabolism cause subtle phenotypes in plants grown i...
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2016-01-01 00:00:00
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更新日期:2008-04-01 00:00:00
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pub_type: 杂志文章
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