In:
FEBS Letters, Wiley, Vol. 203, No. 2 ( 1986-07-28), p. 215-219
Abstract:
The re‐reduction course of P‐680 + , the photooxidized PS II primary donor, was measured as a function of excitation number in Cl − ‐depleted PS II membranes. After the 1st and 2nd excitations the signal amplitude of P‐680 + is small, indicating a submicrosecond reduction of P‐680 + by Z, the secondary donor of PS II. After the 3rd excitation, however, a larger P‐680 + signal with a 40–50 μs half‐life is observed. The slow decay of this signal is attributed to a back‐reaction with a reduced acceptor in the presence of the Z + S 2 state on the donor side. The state Z + S 2 has a lifetime longer than 300 ms and its formation was found to depend on the presence of the abnormal S 2 state created by the 1st excitation. The P‐680 data and thermoluminescence measurements show that the S‐state advancement beyond S 2 is blocked in the absence of Cl − and that the Cl − ‐free abnormal S 2 state has a lifetime about 10‐times longer than the normal S 2 state.
Type of Medium:
Online Resource
ISSN:
0014-5793
,
1873-3468
DOI:
10.1016/0014-5793(86)80745-1
Language:
English
Publisher:
Wiley
Publication Date:
1986
detail.hit.zdb_id:
1460391-3
SSG:
12
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