کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2016870 | 1067705 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
An EPR study of the pH dependence of formate effects on Photosystem II
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کلمات کلیدی
OECP680PPBQphenyl-p-benzoquinoneoxygen-evolving centerthe primary electron donor of PS IIEDTA - اتیلن دی آمین تترا استیک اسید ethylenediamine-tetraacetic acid - اتیلندیامین-تتراستیک اسیدElectron paramagnetic resonance - تشدید پارامغناطیس الکترونoxygen evolution - تکامل اکسیژنreaction center - مرکز واکنش
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Effects of formate on rates of O2 evolution and electron paramagnetic resonance (EPR) signals were observed in the oxygen evolving PS II membranes as a function of pH. In formate treated PS II membranes, decrease in pH value resulted in the inhibition of the O2 evolving activity, a decrease in the intensity of S2 state multiline signal but an increase in the intensity of the QA-Fe2+ EPR signal. Time-resolved EPR study of the YZâ decay kinetics showed that the light-induced intensity of YZâ EPR signal was proportional to the formate concentration. The change in the pH affected both the light-induced intensities and the decay rates of YZâ, which was found to be faster at lower pH. At 253Â K, t1/e value of YZâ decay kinetics was found to be 8-10 s at pHÂ 6.0 and 18-21 s at pHÂ 5.0. The results presented here indicate that the extent of inhibition at the donor and the acceptor side of PS II due to formate is pH dependent, being more effective at lower pH.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Physiology and Biochemistry - Volume 44, Issue 4, April 2006, Pages 186-192
Journal: Plant Physiology and Biochemistry - Volume 44, Issue 4, April 2006, Pages 186-192
نویسندگان
Anjana Jajoo, Nobuhiro Katsuta, Asako Kawamori,