کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1943060 | 1052644 | 2009 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spectral characteristic of fluorescence induction in a model cyanobacterium, Synechococcus sp. (PCC 7942)
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Spectral characteristic of fluorescence induction in a model cyanobacterium, Synechococcus sp. (PCC 7942) Spectral characteristic of fluorescence induction in a model cyanobacterium, Synechococcus sp. (PCC 7942)](/preview/png/1943060.png)
چکیده انگلیسی
We present here three-dimensional time-wavelength-intensity displays of changes in variable fluorescence, during the O(JI)PSMT transient, observed in cyanobacterium at room temperature. We were able to measure contributions of individual chromophores to fluorescence spectra at various times of fluorescence induction (FI). The method was applied to a freshwater cyanobacterium, Synechococcus sp. (PCC 7942). Analysis of our experimental results provides the following new conclusions: (i) the main chlorophyll (Chl) a emission band at â¼Â 685 nm that originates in Photosystem (PS) II exhibits typical fast (OPS) and slow (SMT) FI kinetics with both orange (622 nm) and blue (464 nm) excitation. (ii) Similar kinetics are exhibited for its far-red emission satellite band centered at â¼Â 745 nm, where the PS II contribution predominates. (iii) A significant OPS-SMT-type kinetics of C-phycocyanin emission at â¼Â 650 nm are observed with the blue light excitation, but not with orange light excitation where the signal rose only slightly to a maximum. The induction of F650 was not caused by an admixture of the F685 fluorescence and thus our data show light-inducible and dark-reversible changes of phycobilin fluorescence in vivo. We discuss possible interpretations of this new observation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1787, Issue 10, October 2009, Pages 1170-1178
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1787, Issue 10, October 2009, Pages 1170-1178
نویسندگان
Radek KaÅa, OndÅej PráÅ¡il, OndÅej Komárek, George C. Papageorgiou, Govindjee Govindjee,