Home / Journals / PHYTON / Online First / doi:10.32604/phyton.2020.09144

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ARTICLE

Oxidative Stress Tolerance Mechanism in Rice under Salinity

Mahmuda Binte Monsur1, Nasrin Akter Ivy1, M. Moynul Haque2, Mirza Hasanuzzaman3, Ayman EL Sabagh4,5,*, Md. Motiar Rohman6,*
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: aymanelsabagh@gmail.com; Md. Motiar Rohman. Email: motiar_1@yahoo.com
(This article belongs to this Special Issue: Crop Production under Abiotic Stress: Physiological and Molecular Interventions)

Phyton-International Journal of Experimental Botany https://doi.org/10.32604/phyton.2020.09144

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.

Keywords

Reactive oxygen species (ROS); antioxidants; glyoxalase system; salinity; oxidative stress
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