Study of light-induced changes in the millisecond afterglow of pea chloroplasts

Тип публикации: статья из журнала

Год издания: 1982

Аннотация: The authors have studied the influence of the conditions of coupling and the concentration of MgCl2 in the medium on the amplitude and dark reversibility of the slow phase of the light induced changes in the afterglow (l.i.c.a.) of the chloroplasts. It is shown that the amplitude of the PS phase rises on adding an electron acceptor and is maximum in the absence of exogenous ADP: the creation in the medium of phosphorylating or uncoupling conditions leads to fall in it. It has been established that the level of the afterglow following complete reduction of the acceptor does not correspond to the initial value and is always lower in the absence of ADP; the l.i.c.a. are not completely inverted after dark incubation of the chloroplasts. The reversibility is maximum in a medium with ADP and minimal in one with carbonylcyanide chlorophenylhydrazone. Increase in the concentration of MgCl2 in the medium lowers the amplitude of the PS phase and raises the dark inversion of the l.i.c.a. Change in the amplitude and kinetics of the PS, is not connected with change in the speed of electron transport. It is assumed that the PS fall in l.i.c.a. reflects the fall in the electrical component of the membrane potential of the thylacoid. © 1983.

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Журнал: Biophysics

Выпуск журнала: Vol. 27, Is. 6

Номера страниц: 1016-1021

ISSN журнала: 00063509


  • Grigor'ev Yu.S. (Krasnoyarsk State University, Russian Federation)
  • Morgun V.N. (Krasnoyarsk State University, Russian Federation)
  • Gol'd V.M. (Krasnoyarsk State University, Russian Federation)
  • Gayewskii N.A. (Krasnoyarsk State University, Russian Federation)

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