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'Paraquat' in keywords Facet   section ZfN Section C  [X]
Facet   Publication Year 1987  [X]
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1Author    P. Camilleri, J. R. Bowyer, P. H. McneilRequires cookie*
 Title    The Effects of Photosystem I Electron Acceptors on Leaf Discs  
 Abstract    A leaf-disc chamber has been used to measure changes in photosynthesis by soybean leaf discs which have been supplied with photosystem I (PS I) electron acceptors via the transpiration stream. The uncharged heteropentalenes induce an inhibitory effect on C O ; fixation which is d e­ pendent on the /7-octanol-water partition coefficient o f these molecules. Paraquat, which carries a di-positive charge, was ineffective under the same conditions and at a concentration o f 10-4 m. Cationic species such as K +, Ca2+ and Mg2+ greatly enhanced the effect of paraquat on C 0 2 fixation while the presence o f these ions did not affect inhibition by the heteropentalenes. Such differences betw een uncharged and charged PS I electron acceptors have been explained in terms of electrostatic interactions encountered by paraquat on its way to the site o f action within the chloroplast, via the transpiration stream. 
  Reference    Z. Naturforsch. 42c, 829 (1987); received D ecem ber 1 1986 
  Published    1987 
  Keywords    Photosynthesis, Photosystem I Electron A cceptors, H eteropentalenes, Paraquat, Leaf Discs 
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 TEI-XML for    default:Reihe_C/42/ZNC-1987-42c-0829.pdf 
 Identifier    ZNC-1987-42c-0829 
 Volume    42