Differential blockage of photosynthetic electron flow in young and mature leaves of Arabidopsis thaliana by exogenous proline

Title:

Differential blockage of photosynthetic electron flow in young and mature leaves of Arabidopsis thaliana by exogenous proline

Creator:

Sperdouli, I. and Moustakas, M.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:a4070714-06ee-4735-9762-3219ff7da99b
uuid:a4070714-06ee-4735-9762-3219ff7da99b
issn:0300-3604
doi:10.1007/s11099-015-0116-3

Subject:

fotosyntéza, photosynthesis, chlorophyll fluorescence, electron transport rate, leaf age, reactive oxygen species, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

Responses of the photosynthetic electron transport system of chloroplasts to exogenous proline application were evaluated in young and mature leaves of Arabidopsis thaliana plants under optimal growth conditions. Exogenous proline application (10 mM) during the 4th week of growth increased proline accumulation in young leaves more than in mature leaves, and possibly due to its degradation producing NADPH, decreased significantly the ratio of NADP+/NADPH in both leaf types compared with controls (without proline). However, the ratio of NADP+/NADPH remained significantly higher in the young leaves, suggesting lower proline degradation which resulted in less reduced plastoquinone pool than that in the mature leaves, under both low light [130 μmol(photon) m-2 s-1] and high light [1,200 μmol(photon) m-2 s-1] treatments. The young leaves seemed to adjust nonphotochemical fluorescence quenching in order to maintain a better PSII quantum yield. We concluded that under optimal growth conditions exogenous proline results in overreduction of the plastoquinone pool and blockage of photosynthetic electron flow due to accumulation of NADPH. We suggest that optimum concentrations of proline are required for optimal PSII photochemistry., I. Sperdouli, M. Moustakas., and Obsahuje seznam literatury

Language:

Multiple languages

Rights:

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

Coverage:

471-477

Source:

Photosynthetica | 2015 Volume:53 | Number:3

Harvested from:

CDK

Metadata only:

false