کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2067076 1077880 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A pea mutant (costata) expressing higher activity in thylakoid membrane-bound carbonic anhydrase altersPSII downregulation mechanisms
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوفیزیک
پیش نمایش صفحه اول مقاله
A pea mutant (costata) expressing higher activity in thylakoid membrane-bound carbonic anhydrase altersPSII downregulation mechanisms
چکیده انگلیسی
The interaction between photosynthetic electron transport and the activities of the thylakoid associated carbonic anhydrase (tCA), estimated as combined tCA activity in pea plants (Pisum sativum L. Borek cv., WT) and mutant form (costata 2/125) that differ in chlorophyll content have been compared. Chlorophyll a fluorescence changes after the inhibition of tCA by ethoxyzolamide (EZ), estimating possible role of tCA in PSII downregulation were investigated. Costata expresses higher tCA activity and higher O2 evolution in comparison to WT. Inhibition of tCA by EZ decreased effective PSII photochemistry that coincided with an enhancement in thermal dissipation, while maximal PSII quantum yield (Fv/Fm) did not significantly change. Ethoxyzolamide induced changes in fluorescence parameters that were more strongly expressed in costata 2/125. The results show that tCA is involved in the regulation of the proton gradient across thylakoid membranes and thus limits PSII downregulation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cell Biology International - Volume 33, Issue 8, August 2009, Pages 867-873
نویسندگان
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