Photosystem 2 reaction centers inactive ín plastoquinone pool reduction: a brief overview

Title:

Photosystem 2 reaction centers inactive ín plastoquinone pool reduction: a brief overview

Creator:

Nedbal, L. and Whitmarsh, J.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:8bd9fa2c-4082-4ac4-ae5b-eafa0f445dea
uuid:8bd9fa2c-4082-4ac4-ae5b-eafa0f445dea
urnnbn:urn:nbn:cz:aba007-000fai

Type:

model:internalpart and TEXT

Format:

print

Description:

Photosystem 2 (PS 2) reaction centers inactive in plastoquinone pool reduction are present in isolated thylakoid membranes, intact chloroplasts, and leaves of dark- adapted plants. Here we describe om recent work investigating the physical and physiological properties that distínguish inactive firom active centers. Inactive PS 2 centers are defíned by their slow rate of Q^’ oxidation. They háve a competent water oxidation systém and constitute about one-third of the total PS 2 present in dark- adapted leaves and thylakoid membranes. Their effective absorption cross section for radiant energy utilization is half that of active PS 2 centers. Irradiation modifies inactive PS 2 centers in leaves and thylakoid membranes. The modification is manifested by a 50 % dechne of their varíable fluorescence and of their contribution to the electrochromic shift. In leaves the light-induced modification is reversible in the dark, whereas it is irreversible in thylakoid membranes.

Language:

Multiple languages

Rights:

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

Coverage:

57-61 and 75-79

Source:

Photosynthetica | 1992 Volume:27 | Number:1-2

Harvested from:

CDK

Metadata only:

false