کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10796121 1052694 2005 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cellular energization protects the photosynthetic machinery against salt-induced inactivation in Synechococcus
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Cellular energization protects the photosynthetic machinery against salt-induced inactivation in Synechococcus
چکیده انگلیسی
The effects of the energization of cells by light and by exogenous glucose on the salt-induced inactivation of the photosynthetic machinery were investigated in the cyanobacterium Synechococcus sp. PCC 7942. The incubation of the cyanobacterial cells in a medium supplemented with 0.5 M NaCl induced a rapid decline with a subsequent slow decline, in the oxygen-evolving activity of Photosystem (PS) II and in the electron-transport activity of PSI. Light and exogenous glucose each protected PSII and PSI against the second phase of the NaCl-induced inactivation. The protective effects of light and glucose were eliminated by an uncoupler of phosphorylation and by lincomycin, an inhibitor of protein synthesis. Light and glucose had similar effects on the NaCl-induced inactivation of Na+/H+ antiporters. After photosynthetic and Na+/H+-antiport activities had been eliminated by the exposure of cells to 0.5 M NaCl in the darkness, both activities were partially restored by light or exogenous glucose. This recovery was prevented by lincomycin. These observations suggest that cellular energization by either photosynthesis or respiration, which is necessary for protein synthesis, is important for the recovery of the photosynthetic machinery and Na+/H+ antiporters from inactivation by a high level of NaCl.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1708, Issue 2, 30 June 2005, Pages 201-208
نویسندگان
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