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Treatment of winter rye (Secale cereale L.) seeds with thidiazuron mitigates the toxic response of seedlings to short-term treatment with a herbicide, paraquat

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Abstract

Winter rye (Secale cereale L. cv. Rushnik) seeds were treated with thidiazuron (TDZ; 0.01–10 nmol/L), a plant growth regulator (PGR) with cytokinin-like activity, and grown hydroponically for 7 days. The aim of pretreatment with TDZ was to try and mitigate herbicide-induced stress in winter rye plants. The leaves of 7-days-old seedlings were sprayed with 100 μM of paraquat (PQ), a herbicide, and biochemical and physiological responses were assessed after 4 or 8 h in fully developed leaves. After 8 h, PQ treatment significantly increased H2O2 and lipid peroxidation levels (39% increase for both relative to 0 h) as well as APOX activity (35% increase), but significantly decreased total antioxidant activity (33% decrease) and photosynthetic apparatus activity (up to 38% decrease), as assessed by chlorophyll fluorescence parameters. Pretreatment with TDZ weakened the toxic effects of PQ on rye seedlings, especially 8 h after PQ treatment. This was most evident for low doses (0.01 to 1 nmol/L) of TDZ. An index of efficiency indicated that 0.1 nmol/L TDZ was the most effective concentration to reduce the toxic effect of PQ on winter rye seedlings. This research provides fundamental information about the practical use of TDZ as a means to diminish the toxic effects of a herbicide (PQ) on cultivated winter rye plants.

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Data availability

Data supporting the results of this study are available from the authors, but the availability of these data is subject to restrictions that were used on the recommendation of the Mordovian State University (Saransk, Russia) for this study and therefore are not publicly available. However, the data are available from the authors upon reasonable request and with the permission of the Mordovian State University.

Abbreviations

AOA:

Antioxidative activity

APOX:

Ascorbate peroxidase

CAT:

Catalase

ChlF:

Chlorophyll fluorescence

DPPH:

2,2-Diphenyl-1-picrylhydrazyl

F0 :

Minimum chlorophyll a fluorescence

Fm :

Maximum chlorophyll a fluorescence

Fv/Fm :

Maximum quantum yield of photosystem 2

IE:

Efficiency index of the PGR

LPO:

Lipid peroxidation

MDA:

Malondialdehyde

O2ˉ:

Superoxide

PGR:

Plant growth regulator

POX:

Guaiacol peroxidase

PQ:

Paraquat

PSA:

Photosynthetic apparatus

PSI:

Photosystem 1

PSII:

Photosystem 2

qP:

Coefficient of photochemical quenching of ChlF

ROS:

Reactive oxygen species

TBA:

Thiobarbituric acid

TCA:

Trichloroacetic acid

TDZ:

Thidiazuron

Y(II):

The effective photochemical quantum yield of PSII

Y(NPQ):

The non-photochemical light-induced quenching of ChlF

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Acknowledgements

The authors thank Ms. Anastasija Sokolova for technical assistance during the preparation of this manuscript.

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No funding was received to assist with the preparation of this manuscript.

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Correspondence to Alexander S. Lukatkin.

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Communicated by F. Araniti.

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Lukatkin, A.S., Semenova, A.S. & Teixeira da Silva, J.A. Treatment of winter rye (Secale cereale L.) seeds with thidiazuron mitigates the toxic response of seedlings to short-term treatment with a herbicide, paraquat. Acta Physiol Plant 45, 78 (2023). https://doi.org/10.1007/s11738-023-03565-0

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  • DOI: https://doi.org/10.1007/s11738-023-03565-0

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