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Drought response in winter wheat: protection from oxidative stress and mutagenesis effect

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Abstract

Radiation mutagenesis could provide new drought-tolerant lines for selection purposes in sustainable agriculture. Drought tolerance and yield stability are closely related to co** with oxidative stress, which occurs at severe/prolonged water deprivation. In this study, the response of a newly generated winter wheat mutant line M181/1338K to severe drought stress at seedling stage (3–4th leaf) was compared to that of two established varieties—Guinness (drought tolerant) and Farmer (drought sensitive). Oxidative damage and antioxidant status analyses were performed on second leaves of control, stressed (45–46% leaf water deficit) and recovered plants. Genotypes exhibited similar pattern of stress response, comprising proline accumulation, rise in hydrogen peroxide content and oxidative damage to membrane lipids, increase in total antioxidant and antiradical activities, in phenolic and flavonoid content, in ascorbate and glutathione pools, mobilization of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POX) enzyme isoforms. Farmer responded to severe water stress with the highest levels of oxidative damage to membranes, proline accumulation, and glutathione content, and slower normalization of the studied parameters upon recovery. Guinness presented a better control of oxidative membrane damage and it the highest accumulation of flavonoids under drought. The new mutant line M181/1338K had similarities with Guinness in its response to severe water stress, such as the same proline and glutathione levels. Unlike Guinness, the mutant genotype had more pronounced oxidative damage to membranes, along with higher POX activities, and tended to accumulate less flavonoids under drought, which could be regarded as secondary effects of the induced mutagenesis.

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Abbreviations

AO:

Total antioxidant activity

AR:

Antiradical activity

ASC:

Ascorbic acid

CAT:

Catalase

DPPH:

2,2-Diphenyl-1-picrylhydrazyl

DW:

Dry weight

FRAP:

Ferric reducing antioxidant power assay

FW:

Fresh weight

GSSG:

Oxidized glutathione

GSH:

Reduced glutathione

MDA:

Malondialdehyde

POX:

Peroxidase

ROS:

Reactive oxygen species

RWC:

Relative water content

SOD:

Superoxide dismutase

TW:

Weight at full turgidity

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Acknowledgements

This work was supported in part by project BUL 5014, IAEA—Vienna, and by project BG05M2OP001-2.002-0001 (D.P.) of the Ministry of Science and Education, Bulgaria. The authors are grateful to their colleague assoc. prof. Irina Vaseva, who helped for substantial improvement of the English expression.

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Correspondence to Elisaveta Kirova.

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Communicated by E. Kuzniak-Gebarowska.

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Kirova, E., Pecheva, D. & Simova-Stoilova, L. Drought response in winter wheat: protection from oxidative stress and mutagenesis effect. Acta Physiol Plant 43, 8 (2021). https://doi.org/10.1007/s11738-020-03182-1

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  • DOI: https://doi.org/10.1007/s11738-020-03182-1

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