Exploring the Role of Bioactive Polyphenolic Antioxidants in Salinity Tolerance of Two Rice Landraces from Coastal Areas of Bangladesh
Uthpal Krishna Roy1,2, Ananya Dey2 and Soumen Bhattacharjee2*
1Department of Botany, University of Rajshahi, Bangladesh
2Department of Botany, The University of Burdwan, West Bengal, India
*Corresponding Author: Soumen Bhattacharjee, Professor and Coordinator, UGC Centre for Advanced Study, Department of Botany, The University of Burdwan, West Bengal, India.
March 28, 2022; Published: April 29, 2022
The bioactive polyphenolic compounds (BPC), play an important role in the restoration of cellular redox homeostasis but are seldom studied in context of salinity stress tolerance in rice. RP-HPLC based comparative analysis of some important bioactive polyphenolic compounds (gallic acid, protocatechuic acid, para-hydroxy benzoic acid, catechin, chlorogenic acid, vanillic acid, caffeic acid, syringic acid, p-coumaric acid, ferulic acid, sinapic acid, salicylic acid, naringin, rutin, ellagic acid, myricetin, quercetin, naringenin, apigenin and kaempferol) from seedling of two rice landraces (Oryza sativa L. landraces Kutepatnai and Charobalam) subjected to post imbibitional salinity stress (PISS) not only exhibited differential landrace specific accumulation but also exhibited strong correlation with salinity tolerance. The landrace Kutepatnai exhibiting the ability to maintain redox homeostasis under PISS (assessed in terms of biomarkers of oxidative stress like the relative reactive oxygen species accumulation, relative total antioxidant competence and relative oxidative membrane damage) showed significantly greater up-regulation of majority of the polyphenolic compounds derived from chalcone synthase, and cinnamic acid dependent pathway as compared to the salt susceptible landrace Charobalam. The positive correlation between bioaccumulation of BPC (protocatechuic acid, ellagic acid, caffeic acid, syringic acid, rutin, catechin, myricetin, quercetin and apigenin) with redox parameters suggests their role in regulation of redox homeostasis necessary for salt tolerance in experimental land races of coastal areas of Bangladesh.
Keywords: Rice Landraces; Salinity Tolerance; Bioactive Polyphenolic Compounds; Antioxidants; Redox Homeostasis
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