Open Access

ARTICLE

Oxidative Stress Tolerance Mechanism in Rice under Salinity

by Mahmuda Binte Monsur, Nasrin Akter Ivy, M. Moynul Haque, Mirza Hasanuzzaman, Ayman EL Sabagh, Md. Motiar Rohman

1 Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
2 Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
3 Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka, 1207, Bangladesh
4 Department of Agronomy, Faculty of Agriculture, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt
5 Department of Field Crops, Faculty of Agriculture, Siirt University, Siirt, 56100, Turkey
6 Molecular Breeding Lab, Plant Breeding Division, Bangladesh Agricultural Research Institute, Gazipur, 1701, Bangladesh

* Corresponding Authors: Ayman EL Sabagh. Email: ; Md. Motiar Rohman. Email:

(This article belongs to the Special Issue: Crop Production under Abiotic Stress: Physiological and Molecular Interventions)

Phyton-International Journal of Experimental Botany 2020, 89(3), 497-517. https://doi.org/10.32604/phyton.2020.09144

Received 14 November 2019; Accepted 06 January 2020; Issue published 22 June 2020

Abstract

The research was conducted to investigate comparative oxidative damage including probable protective roles of antioxidant and glyoxalase systems in rice (Oryza sativa L.) seedlings under salinity stress. Seedlings of two rice genotypes: Pokkali (tolerant) and BRRI dhan28 (sensitive) were subjected to 8 dSm⁻¹ salinity stress for seven days in a hydroponic system. We observed significant variation between Pokkali and BRRI dhan28 in phenotypic, biochemical and molecular level under salinity stress. Carotenoid content, ion homeostasis, antioxidant enzymes, ascorbate and glutathione redox system and proline accumulation may help Pokkali to develop defense system during salinity stress. However, the activity antioxidant enzymes particularly superoxide dismutase (SOD), catalase (CAT) and non-chloroplastic peroxidase (POD) were observed significantly higher in Pokkali compared to salt-sensitive BRRI dhan28. Higher glyoxalase (Gly-I) and glyoxalase (Gly-II) activity might have also accompanied Pokkali genotype to reduce potential cytotoxic MG through non-toxic hydroxy acids conversion. However, the efficient antioxidants and glyoxalase system together increased adaptability in Pokkali during salinity stress.

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