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Silicon Alleviates Cadmium Toxicity in <i>Triticum aestivum</i> L. Plants by Modulating Antioxidants, Nutrient Uptake, and Gene Expression

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Last updated: 01 Jan 2025

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Abstract

SILICON (Si) is beneficial for plant growth and has the potential to alleviate the deleterious effects of heavy metals in plants grown on contaminated soils. This study aimed to evaluate the adaptive mechanisms induced by Si application (1mM sodium meta-silicate, Na2O3Si.9H2Ox) in Triticum aestivum L. plants subjected to cadmium (Cd) stress (100 and 200μM CdSO4). Under Cd stress, Si application significantly increased plant biomass, relative water content, nutrient uptake, and allocation as well as Si content while it decreased Cd accumulation compared to Cd-stressed plants. Si application also induced lignin content, mainly in roots, in the presence or absence of Cd in comparison to controls. Cd stress significantly increased the accumulation of oxalate, malate and citrate contents in the roots in comparison to control, whereas Si supplementation increased malate, and citrate in shoots. Additionally, Cd-induced oxidative stress designated by the increment of malondialdehyde, H2O2 contents and electrolyte leakage was diminished upon Si application. Concomitantly, Cd-stress markedly enhanced glutathione reductase (GR), glutathione peroxidase (GSHPx), and ascorbate peroxidase (APx) while GSH/GSSG and ASA/DHASA ratios decreased. Si application significantly induced all tested antioxidant enzymes and increased GSH/GSSG and ASA/DHASA ratios. Interestingly, low-affinity Cd transporter (LCT1), ATPase/heavy metal transporter (HMA2), and phytochelatine synthase (PCs) genes expression decreased in the shoots and roots of Si+ Cd-treated plants, while that of Si transporter (Si1) markedly increased, which may contribute to Cd uptake reduction and increased Si content. Taken together, the results highlight the role of Si in alleviating the adverse effect of Cd on wheat plants.

DOI

10.21608/ejbo.2021.59947.1618

Keywords

antioxidants, Cadmium stress, lignin, Metal transporters, organic acids, silicon, <i>Triticum aestivum</i>

Authors

First Name

Nabil E.

Last Name

Saber

MiddleName

-

Affiliation

Botany and Microbiology Department, Faculty of Science, Alexandria University, Alexandria, Egypt

Email

nabilsaber@hotmail.com

City

Alexandria

Orcid

-

First Name

Manal M.

Last Name

Abdel-Rahman

MiddleName

-

Affiliation

Genetics and plant pathology Department, Faculty of Agriculture, Damanhour University, Damanhour, Egypt

Email

mm.rahman@agr.dmu.edu.eg

City

Alexandria

Orcid

-

First Name

Mona E.M.

Last Name

Mabrouk

MiddleName

-

Affiliation

Botany and Microbiology Department, Faculty of Science, Damanhour University, Damanhour, Egypt

Email

mona_mabrouk_eg@hotmail.com

City

-

Orcid

-

First Name

Emanan M.M.

Last Name

Eldebawy

MiddleName

-

Affiliation

Botany and Microbiology Department, Faculty of Science, Damanhour University, Damanhour, Egypt

Email

emy628@yahoo.com

City

Damanhour

Orcid

-

First Name

Ghada S.M.

Last Name

Ismail

MiddleName

-

Affiliation

Botany and Microbiology Department, Faculty of Science, Alexandria University, Alexandria, Egypt

Email

ghada5f@yahoo.com

City

Alexandria

Orcid

-

Volume

62

Article Issue

2

Related Issue

33732

Issue Date

2022-05-01

Receive Date

2021-02-03

Publish Date

2022-05-01

Page Start

319

Page End

336

Print ISSN

0375-9237

Online ISSN

2357-0350

Link

https://ejbo.journals.ekb.eg/article_182058.html

Detail API

https://ejbo.journals.ekb.eg/service?article_code=182058

Order

3

Type

Original Article

Type Code

111

Publication Type

Journal

Publication Title

Egyptian Journal of Botany

Publication Link

https://ejbo.journals.ekb.eg/

MainTitle

Silicon Alleviates Cadmium Toxicity in <i>Triticum aestivum</i> L. Plants by Modulating Antioxidants, Nutrient Uptake, and Gene Expression

Details

Type

Article

Created At

22 Jan 2023