Decrease of fluorescence intensity after the K step in chlorophyll a fluorescence induction is suppressed by electron acceptors and donors to photosystem 2

Title:

Decrease of fluorescence intensity after the K step in chlorophyll a fluorescence induction is suppressed by electron acceptors and donors to photosystem 2

Creator:

Lazár, D., Pospíšil, P., and Nauš, J.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:86262c24-6631-47bf-a002-d1ba93b64d7b
uuid:86262c24-6631-47bf-a002-d1ba93b64d7b
issn:0300-3604
doi:10.1023/A:1007112222952

Subject:

charge recombination, fluorescence quenching, high temperature stress, and Pisum sativum

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Chlorophyll a fluorescence induction measured by a fluorometer with a high temperature stressed plant material shows a new K step which is a clear peak due to fast fluorescence rise and subsequent decrease of fluorescence intensity. We focused on an explanation of the decrease of fluorescence after the K step using artificial electron acceptors and donors to photosystem 2 (PS2). Addition of the artificial electron acceptors or donors suppressed the decrease of fluorescence after the K step. We suggest that the decrease mainly reflects (by more than 81 %) an energy loss process in the reaction centre of PS2 which is most probably a nonradiative charge recombination between P680+ (oxidised primary electron donor in PS2) and a negative charge stored on either Pheo- or QA- (reduced primary electron acceptor of PS2 and reduced primary quinone electron acceptor of PS2, respectively). We suggest that the energy loss process is only possible when the inhibition of both the donor and the acceptor sides of PS2 occurs. and D. Lazár, P. Pospíšil, J. Nauš.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

255-265

Source:

Photosynthetica | 1999 Volume:37 | Number:2

Harvested from:

CDK

Metadata only:

false