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On the participation of chloride in bicarbonate‐induced reversal of anion inhibition of photosystem II electron transport in spinach thylakoids
Author(s) -
Jajoo Anjana,
Bharti Sudhakar
Publication year - 1993
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1993.tb01763.x
Subject(s) - photosystem ii , electron transport chain , chemistry , plastoquinone , formate , thylakoid , bicarbonate , photochemistry , p680 , dcmu , chloride , spinach , nigericin , oxygen evolving complex , ion , inorganic chemistry , photosystem i , chloroplast , photosynthesis , biochemistry , membrane , catalysis , organic chemistry , gene
Inhibition of electron transport through photosystem II (PS II) by formate (HCO − 2 ) or nitrite (NO − 2 ) in the presence or absence of chloride ions was studied. The inhibition induced by HCO − 2 or NO − 2 is overcome by HCO − 3 more in the presence, than in the absence of Cl − . The data on electron transport are supported by chlorophyll a fluorescence measurements. In experiments. In experiments in which water oxidation was blocked. Cl − was found to facilitate electron transport between bound quinone A (Q − A ) and the plastoquinone (PQ) pool. It can thus be concluded that in addition to the well known site of action of Cl − on water oxidation, another site of Cl − action is between Q − A and the PQ pool.