Photochemical properties of photosystem 2 in primary leaves of barley seedlings grown under various blue or red irradiances

Title:

Photochemical properties of photosystem 2 in primary leaves of barley seedlings grown under various blue or red irradiances

Creator:

Egorova, E. A. and Bukhov, N. G.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:08872247-c0af-43db-ad27-58421d6a2c2e
uuid:08872247-c0af-43db-ad27-58421d6a2c2e
issn:0300-3604
doi:10.1023/A:1022662605791

Subject:

blue radiation, chlorophyll fluorescence, photosystem 2, and red radiation

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Photosystem 2 (PS2)-driven electron transfer was studied in primary leaves of barley (Hordeum vulgare L.) seedlings grown under various photon fluxes (0.3-170.0 μmol m-2 s-1) of blue (BR) or red (RR) radiation using modulated chlorophyll fluorescence. The Fv/Fm ratio was 0.78-0.79 in leaves of all radiation variants, except in seedlings grown under BR or RR of 0.3 μmol m-2 s-1. The extent of the photochemical phase of the polyphasic Fv rise induced by very strong "white light" was similar in leaves of all radiation treatments. Neither radiation quality nor photon flux under plant cultivation influenced the amount of non QB-transferring centres of PS2 except in leaves of seedlings grown under BR of 0.3 μmol m-2 s-1, in which the amount of such centres increased threefold. Both BR and RR stimulated the development of photochemically competent PS2 at photon fluxes as low as 3 μmol m-2 s-1. Three exponential components with highly different half times were distinguished in the kinetics of Fv dark decay. This indicates different pathways of electron transfer from QA-, the reduced primary acceptor of PS2, to other acceptors. Relative magnitudes of the individual decay components did not depend on the radiation quality or the photon flux during plant cultivation. Significant differences were found, however, between plants grown under BR or RR in the rate of the middle and fast components of Fv dark decay, which showed 1.5-times faster intersystem linear electron transport in BR-grown leaves. and E. A. Egorova, N. G. Bukhov.

Language:

Multiple languages

Rights:

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

Coverage:

343-347

Source:

Photosynthetica | 2002 Volume:40 | Number:3

Harvested from:

CDK

Metadata only:

false