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The effect of light quality on the pro-/antioxidant balance, activity of photosystem II, and expression of light-dependent genes in Eutrema salsugineum callus cells

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Abstract

The antioxidant balance, photochemical activity of photosystem II (PSII), and photosynthetic pigment content, as well as the expression of genes involved in the light signalling of callus lines of Eutrema salsugineum plants (earlier Thellungiella salsuginea) under different spectral light compositions were studied. Growth of callus in red light (RL, maximum 660 nm), in contrast to blue light (BL, maximum 450 nm), resulted in a lower H2O2 content and thiobarbituric acid reactive substances (TBARS). The BL increased the activities of key antioxidant enzymes in comparison with the white light (WL) and RL and demonstrated the minimum level of PSII photochemical activity. The activities of catalase (CAT) and peroxidase (POD) had the highest values in BL, which, along with the increased H2O2 and TBARS content, indicate a higher level of oxidative stress in the cells. The expression levels of the main chloroplast protein genes of PSII (PSBA and PSBD), the NADPH-dependent oxidase gene of the plasma membrane (RbohD), the protochlorophyllide oxidoreductase genes (POR B, C) involved in the biosynthesis of chlorophyll, and the key photoreceptor signalling genes (CIB1, CRY2, PhyB, PhyA, and PIF3) were determined. Possible mechanisms of light quality effects on the physiological parameters of callus cells are discussed.

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Abbreviations

APX:

Ascorbate peroxidase

SOD:

Superoxide dismutase

POD:

Peroxidase

CAT:

Catalase

TBARS:

Thiobarbituric acid reactive substances

BL:

Blue light from light-emitting diodes 450 nm

WL:

White light from light-emitting diodes 450 nm + 660 nm

RL:

Red light from light-emitting diodes 660 nm

WCFL:

Light from white compact fluorescent lamps

CRY:

Cryptochrome

PHY:

Phytochrome

PSII:

Photosystem II

ROS:

Reactive oxygen species

ETC:

Electron transport chain

Chla :

Chlorophyll a

Chlb :

Chlorophyll b

Car:

Carotenoids

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Acknowledgements

This work was supported by the Russian Foundation for Basic Research (RFBR) on 15-04-01199a and by the Program of the Presidium of the Russian Academy of Sciences “Molecular and Cellular Biology” (MCB RAS).

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Correspondence to P. P. Pashkovskiy.

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Pashkovskiy, P.P., Soshinkova, T.N., Korolkova, D.V. et al. The effect of light quality on the pro-/antioxidant balance, activity of photosystem II, and expression of light-dependent genes in Eutrema salsugineum callus cells. Photosynth Res 136, 199–214 (2018). https://doi.org/10.1007/s11120-017-0459-7

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  • DOI: https://doi.org/10.1007/s11120-017-0459-7

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