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EI-Kassabany,, S. (2006). INHIBITION OF SPINACH CHLOROPLAST PHOTOPHOSPHORYLATION AND ELECTRON TRANSPORT BY SELECTED NATURAL PRODUCTS. Journal of Plant Protection and Pathology, 31(1), 411-418. doi: 10.21608/jppp.2006.235147
Shafika A. EI-Kassabany,. "INHIBITION OF SPINACH CHLOROPLAST PHOTOPHOSPHORYLATION AND ELECTRON TRANSPORT BY SELECTED NATURAL PRODUCTS". Journal of Plant Protection and Pathology, 31, 1, 2006, 411-418. doi: 10.21608/jppp.2006.235147
EI-Kassabany,, S. (2006). 'INHIBITION OF SPINACH CHLOROPLAST PHOTOPHOSPHORYLATION AND ELECTRON TRANSPORT BY SELECTED NATURAL PRODUCTS', Journal of Plant Protection and Pathology, 31(1), pp. 411-418. doi: 10.21608/jppp.2006.235147
EI-Kassabany,, S. INHIBITION OF SPINACH CHLOROPLAST PHOTOPHOSPHORYLATION AND ELECTRON TRANSPORT BY SELECTED NATURAL PRODUCTS. Journal of Plant Protection and Pathology, 2006; 31(1): 411-418. doi: 10.21608/jppp.2006.235147

INHIBITION OF SPINACH CHLOROPLAST PHOTOPHOSPHORYLATION AND ELECTRON TRANSPORT BY SELECTED NATURAL PRODUCTS

Article 1, Volume 31, Issue 1, January 2006, Page 411-418  XML PDF (2.59 MB)
Document Type: Original Article
DOI: 10.21608/jppp.2006.235147
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Author
Shafika A. EI-Kassabany,
Pesticide Central Laboratory, Agriculture Research Center, Sabahia, . Alexandria, Egypt.
Abstract
The effects of the biflavonoid crassifolin (1), the flavonoid tephrobotin, the
Annnonaceous acetogenins squamocin (3), and buliatacin (4) were investigated on
different photosynthetic activities in isolated spinach chloroplasts. The results
indicated that compounds 1-4 inhibited both ATP synthesis and uncoupled electron
transport. In addition, s~uamocin (3), and bullatacin (4) enhanced basal electron flow
and light-activated Mg + -ATPase. Therefore, acetogenins 3, and 4 behave as
uncouplers and Hill reaction inhibitors. Compounds 1, and 2 inhibited basal electron
flow and did not affect light-activated Mg2+ -ATPase. All the compounds induced a
concentration-dependent inhibition of photophosphorylation. Natural products 1-4 did
, not affect photosystem I (PSI) activity but they inhibited photosystem II (PSII) electron
flow. The study of the partial PSII reactions from H20 to OCPIPox, H20 to SiMo and
diphenykarbazide OPC to OCPIP established that the site of inhibition was at the
oxygen-evolving complex (OEC).
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