Cyclic electron transport around photosystem I and its relationship to non-photochemical quenching in the unicellular green alga Dunaliella salina under nitrogen deficiency.

Abstract:

:Electron transport in photosystem II (PSII) and photosystem I (PSI) was estimated in terms of chlorophyll fluorescence and changes in P700 redox, respectively, in the unicellular green alga Dunaliella salina in the presence or absence of a nitrogen source in the culture medium. In a nitrogen-containing medium, the quantum yield of PSII (Φ(II)) and that in PSI (Φ(I)) were at the same level in low light, but cyclic electron transport around photosystem I (CET-PSI) was induced under high light as estimated from an increase in Φ(I)/Φ(II). High light might further enhance the rate of electron transport in PSI by inducing the state 2 transition, in which the distribution of light energy is shifted to PSI at the expense of PSII. Nitrogen deficiency resulted in a decrease in Φ(II) and an increase in Φ(I). As a consequence, the rate of CET-PSI was expected to increase. The high CET-PSI under N deficiency was probably associated with a high level of energy quenching (qE) formation in PSII.

journal_name

J Plant Res

authors

Einali A,Shariati M,Sato F,Endo T

doi

10.1007/s10265-012-0512-8

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

179-86

issue

1

eissn

0918-9440

issn

1618-0860

journal_volume

126

pub_type

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