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Selenium supplementation to lentil (Lens culinaris Medik.) under combined heat and drought stress improves photosynthetic ability, antioxidant systems, reproductive function and yield traits

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Abstract

Purpose

Increasing temperatures are generating heat and drought stress, especially for the cool-season crops such as lentil,; selenium can mitigate the adverse effects of various abiotic stresses but has never been tested in plants facing combined heat and drought stress.

Methods

In this study, contrasting heat-sensitive and heat-tolerant lentil genotypes were grown in the absence (control) or presence of selenium (1, 2.5, 5.0 mg kg–1 dry soil). At the onset of flowering, plants were subjected to combined heat and drought stress by moving in a controlled environment [32/20 °C day/night (12/12 h), 50% soil field capacity, 500 µmol m–2 s–1 light intensity, 65–70% RH] for 20 days, up to completion of maturity stress.

Results

The results revealed that lentil plants exposed to the combined stress + Se significantly increased endogenous leaf Se concentration, pod number (32–36% in sensitive, 19–24% in tolerant genotypes), and seed yield (21–35% in sensitive, 21–25% in tolerant genotypes), compared to the combined stress treatment alone. Se supplementation significantly improved leaf water status and osmolyte accumulation (such as proline, glycine betaine, and reducing sugars), which stabilized membranes and photosynthesis-related traits, enhanced the expression of various enzymatic (superoxide dismutase, catalase, ascorbate peroxidase, glutathione reductase) and non-enzymatic (ascorbate and reduced glutathione) antioxidants and flower function, and improved pollen function, pod set, pod number, and seed number.

Conclusions

Our study showed the potential benefits of using selenium as a supplement in the low-Se soils to protect against combined heat and drought stress in lentil.

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Acknowledgements

K.S., A.S, A.B., and K.B. are thankful to the Council of Scientific and Industrial Research, India. H.N. is thankful to the Department of Science and Technology, Department of Biotechnology, Department of Science and Technology Purse Award from the Ministry of Agriculture, India; Consultative Group of International Agricultural Research, International Center for Agricultural Research in the Dryland Area (ICARDA—Morocco); and The University of Western Australia for funding the research and infrastructural facilities from time to time. Thanks to Dr. Jitendra Kumar (IIPR, Kanpur) for providing the lentil germplasm.

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Authors

Contributions

K.S., A.S, A.B., and K.B performed the experiments; HN, UJ, PV analyzed the data; SS, SK contributed materials; KHMS planned and designed the research; K.S.,HN wrote an initial version of the manuscript that was read and revised by all authors.

Corresponding author

Correspondence to Harsh Nayyar.

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The authors declare no competing interests.

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Responsible Editor: Fangjie Zhao

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Sita, K., Sehgal, A., Bhardwaj, A. et al. Selenium supplementation to lentil (Lens culinaris Medik.) under combined heat and drought stress improves photosynthetic ability, antioxidant systems, reproductive function and yield traits. Plant Soil 486, 7–23 (2023). https://doi.org/10.1007/s11104-022-05310-x

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  • DOI: https://doi.org/10.1007/s11104-022-05310-x

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