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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Silicon mitigates salinity effects on sorghum-sudangrass (Sorghum bicolor × Sorghum sudanense) by enhancing growth and photosynthetic efficiency

Farah Bounaouara https://orcid.org/0009-0001-8992-0430 A , Rabaa Hidri https://orcid.org/0000-0003-3550-2126 A , Mohammed Falouti https://orcid.org/0009-0006-1340-6562 A , Mokded Rabhi https://orcid.org/0000-0001-6817-585X A B , Chedly Abdelly https://orcid.org/0000-0003-2249-1130 A , Walid Zorrig https://orcid.org/0000-0001-6607-9151 A # * and Inès Slama https://orcid.org/0000-0001-8165-146X A #
+ Author Affiliations
- Author Affiliations

A Laboratory of Extremophile Plants, Centre of Biotechnology of Borj-Cedria, P. O. Box 901, Hammam-Lif 2050, Tunisia.

B Department of Plant Production, College of Agriculture and Food, Qassim University, Buraydah, Saudi Arabia.


Handling Editor: Suleyman Allakhverdiev

Functional Plant Biology 51, FP24029 https://doi.org/10.1071/FP24029
Submitted: 23 January 2024  Accepted: 31 May 2024  Published: 20 June 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

The aim of this study was to investigate whether silicon (Si) supply was able to alleviate the harmful effects caused by salinity stress on sorghum-sudangrass (Sorghum bicolor × Sorghum sudanense), a species of grass raised for forage and grain. Plants were grown in the presence or absence of 150 mM NaCl, supplemented or not with Si (0.5 mM Si). Biomass production, water and mineral status, photosynthetic pigment contents, and gas exchange parameters were investigated. Special focus was accorded to evaluating the PSI and PSII. Salinity stress significantly reduced plant growth and tissue hydration, and led to a significant decrease in all other studied parameters. Si supply enhanced whole plant biomass production by 50%, improved water status, decreased Na+ and Cl accumulation, and even restored chlorophyll a, chlorophyll b, and carotenoid contents. Interestingly, both photosystem activities (PSI and PSII) were enhanced with Si addition. However, a more pronounced enhancement was noted in PSI compared with PSII, with a greater oxidation state upon Si supply. Our findings confirm that Si mitigated the adverse effects of salinity on sorghum-sudangrass throughout adverse approaches. Application of Si in sorghum appears to be an efficient key solution for managing salt-damaging effects on plants.

Keywords: biomass production, osmotic adjustment, photosynthetic behaviour, photosystem I, photosystem II, salinity stress, silicon supply, sorghum-sudangrass.

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