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<span style="font-size:14.0pt;font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language: EN-US;mso-bidi-language:AR-SA">Shortening of life-time of the pair [P<sub>680 </sub><sup>+</sup>Pheo<sup>-</sup>] contributes to general inhibitory effect of dinoseb on electron transfer in PS-II</span>

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Title Shortening of life-time of the pair [P680 +Pheo-] contributes to general inhibitory effect of dinoseb on electron transfer in PS-II
 
Creator Klimov, Vyacheslav V
Allakhverdiev, Suleyman I
Zharmukhamedov, Serguei K
 
Description 491-497
It is shown that dinoseb, added to subchloroplast photosystem
(PS-II) preparations from pea at a concentration
higher than 5 μM, along with blocking the electron transfer on the
acceptor side of PS-II , induces the following effects revealing its capability
to have redox interaction with the components of PS-II reaction center (RC)-
pheophytin (pheo) and chlorophyll P680 : ( I) acceleration of the
dark relaxation of absorbance ( ΔA
) and chlorophyll fluorescence (ΔF
) changes related to photoreduction of
Pheo as a result of the photoreaction  [P680
Pheo]  [P680 Pheo] that leads to
elimination of the ΔA and
ΔF
at a concentration of the inhibitor
higher than 50 μM; (2) lowering of the
maximum level of fluorescence (F) due to a decrease of ΔF
under the condition when the electron  acceptor, QA  is reduced; (3) loss of the described
effects of dinoseb and appearance of its capability to donate electron to RC of
PS-II in the presence of dithionite which reduces dinoseb in the dark ; (4)
inhibition of ΔA related to photooxidation
of P680; (5)
activation of ΔA
related to photooxidation P700
in

photosystem-I (PS-I) preparations (a
similar effect is observed upon the addition of 0.2 mM
methylviologen ). It is suggested thaat redox interaction with the pair [P680
+Pheo-]  leading
to the  shortening of its life- time
contributes to the general effect of inhibition of electron transfer in PS-II by
dinoseb.
 
Date 2012-12-28T20:15:59Z
2012-12-28T20:15:59Z
2000-12
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://hdl.handle.net/123456789/15394
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJBB Vol.37(6) [December 2000]