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Action of bi carbonate and photosystem 2 inhibiting herbicides on electron transport in pea pisum sativum cultivar rondo grana and in thylakoids of a blue green alga synechococcus leopoliensis



Action of bi carbonate and photosystem 2 inhibiting herbicides on electron transport in pea pisum sativum cultivar rondo grana and in thylakoids of a blue green alga synechococcus leopoliensis



Physiologia Plantarum 51(1): 106-110



Bicarbonate (or CO2) is required for electron transport in isolated broken pea chloroplasts. The site of action of the bicarbonate ion is between the primary electron acceptor or Photosystem 2, Q and the plastoquinone pool. After trypsin treatment the Hill reaction with ferricyanide does not require bicarbonate. Photosystem 2 inhibiting herbicides act also at this site. A possible interaction of bicarbonate and these herbicides in their effect on photosynthetic electron transport was studied. The reciprocal of the Hill reaction rate in CO2-depleted chloroplasts was plotted against the reciprocal of added bicarbonate concentration in the absence, and in the presence of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), 2-methoxy-4,6-bis (ethylamino)-1,3,5-triazine (simeton) or 4,6-dinitro-o-cresol (DNOC). From Lineweaver-Burk plots it was concluded that DCMU and simeton inhibit both bicarbonate binding and Vmax. Purely competitive inhibition of bicarbonate binding by DNOC was suggested. DNOC may exert its inhibition of electron transport by removing bicarbonate from its binding site. In isolated thylakoid membranes of S. leopoliensis there was no bicarbonate effect or inhibition by DNOC after Q; in the thylakoids of this blue-green alga the binding site for bicarbonate and DNOC between Q and plastoquinone is absent.

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