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Accumulation of Polyphenolic Compounds and Osmolytes under Dehydration Stress and Their Implication in Redox Regulation in Four Indigenous Aromatic Rice Cultivars

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Rice science 2020年第4期27卷 329-344页

作者： Nivedita DEY soumen bhattacharjee Plant Physiology and Biochemistry Research Laboratory/University Grants Commission Centre for Advanced Study Department of BotanyUniversity of BurdwanBurdwan 713104West BengalIndia

Present work was undertaken to screen some drought tolerant indigenous aromatic rice cultivars(IARCs),commonly cultivated in West Bengal,India,based on their capacity to produce osmolytes,redox-sensitive phenolic acids and flavonoids,as contrivances for redox-regulation under drought *** glycol induced post imbibitional dehydration stress mediated changes in redox regulatory properties of the germinating seeds of the four IARCs(Jamainadu,Tulaipanji,Sitabhog,Badshabhog),which were assessed in terms of changes in prooxidant accumulation(in-situ localization of reactive oxygen species(ROS)by confocal microscopy,DCFDA(2′,7′-dichlorofluorescin diacetate)oxidation,O2-and H2O2 accumulation),cumulative antioxidative defense(radical scavenging property and total thiol content),ROS scavenging phenolic acids(gallic acid,protocatechuic acid,gentisic acid,para-hydroxy benzoic acid,chlorogenic acid,caffeic acid,syringic acid,salicylic acid,sinapic acid and p-coumaric acid)and flavonoids(catechin,naringin,rutin,quercetin,kaempferol,myricetin and apigenin).The capability of germinating seeds to accumulate osmolytes(like glycinebetaine,proline,soluble carbohydrates and K+ion)and polyphenolic compounds was also correlated with their corresponding redox status and redox biomarkers(conjugated diene,hydroperoxide,thiobarbituric acid reactive substances and free carbonyl content)produced under the same *** results in general showed that accumulation of osmolytes along with the redox-sensitive phenolics and flavonoids conferred the ability to maintain the redox homeostasis under drought stress for the tolerant IARCs(Badshabhog and Tulaipanji).

关键词： aromatic rice drought polyphenolic compounds osmolytes redox regulation

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Bioactive polyphenolic compounds, water-soluble vitamins, in vitro anti-inflammatory, anti-diabetic and free radical scavenging properties of underutilized alternate crop Amaranthus spinosus L. from Gangetic plain of West Bengal

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Food Bioscience 2022年第6期50卷 799-813页

作者： Agnideepa Kar soumen bhattacharjee Plant Physiology&Biochemistry Research laboratory UGC Centre for Advanced StudyDepartment of BotanyThe University of BurdwanBurdwanWest BengalIndia UGC Centre for Advanced Study Department of BotanyThe University of BurdwanBurdwanWest BengalIndia

Studies associated with validation of folklore and ethnomedicinal claim of utilization of different plant parts of ‘ spiny amaranth’ (Amaranthus spinosus L.) against degenerative diseases with chemical data, particularly the bioactive polyphenolic compounds and associated anti-degenerative properties are scanty and is the purpose of the present investigations. RP-HPLC coupled photodiode assay was employed for the quantification of twenty-one health promoting bioactive polyphenolic antioxidants derived from phenylpropanoid pathway from different plant parts of Amaranthus spinosus L. for validating organoleptic traditional claims as well as current trends in practice of this underutilized medicinal herb. Further, important water-soluble vitamins [vitamin B1, B2, B3, B6, B9] present in different plant parts were extracted and estimated through RP-HPLC for validating the claim of their functional food properties. The antioxidant-based functional food property of different plant parts of Amaranthus spinosus were corroborated from the data of in vitro free radical scavenging, metal-chelating, reducing, superoxide radical scavenging, hydroxyl radical scavenging, anti-protein coagulation, anti-lipid peroxidation and antidiabetic properties. When compared, a positive correlation in accumulation of polyphenolic compounds and water-soluble vitamins tested with antioxidant attributes were noticed for different plant parts, strongly substantiating their phytonutrient properties. Taken as a whole, the present work provides data on organ-specific bioavailability of bioactive polyphenolic antioxidant compounds, water soluble B- vitamins and their functional attributes for validating traditional claims as well as existing trends in consumption of this underutilized medicinal vegetable as low-cost natural antioxidant supplement and functional food, which may encourage their effective exploration and utilization.

关键词： Spiny amaranth Bioactive polyphenolic compounds B-Vitamins Antioxidant and anti-inflammatory properties Ethnomedicinal use Functional food

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ROS-hormone interaction in regulating integrative défense signaling of plant cell

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BIOCELL 2023年第3期47卷 503-521页

作者： DURGA KORA ANANYA DEY BABITA PAL UTHPAL KRISHNA ROY NIVEDITA DEY TREESHA BHATACHARJEE soumen bhattacharjee Plant Physiology and Biochemistry Research Laboratory Department of BotanyUniversity of BurdwanBurdwan713104India Department of Botany University of RajsahiRajsahi6205Bangladesh

The elaborate redox network of the cell,comprising of events like turnover of reactive oxygen species(ROS),redox sensing,signaling,expression of redox-sensitive genes,etc.,often orchestrates with other bonafide hormonal signaling pathways through their synergistic or antagonistic action in the plant *** redox cue generated in plant cells under fluctuating environmental conditions can significantly influence other hormonal biosynthetic or signaling mechanisms,thereby modulating physiology towards stress acclimation and *** is also strong evidence of the recruitment of ROS as a‘second messenger’in different hormonal signaling pathways under ***,the retrograde signaling initiated by ROS also found to strongly influence hormonal homeostasis and *** present review,in this aspect,is an effort towards understanding the regulatory roles of ROS in integrating and orchestrating other hormonal signaling pathways or vice versa so as to unfold the relationship between these two signaling episodes of plant cells under environmental *** also accentuate the significance of understanding the utterly complex interactions,which occur both at metabolic and genetic levels between ROS and phytohormones during stress ***,the significant and decisive role of ROS turnover,particularly the contribution of RBOH(respiratory burst oxidase homologs)in the synergism of redox and hormone signaling during systemic acquired acclimation under stress is also discussed.

关键词： ROS-hormone cross-talking Abiotic stress Integrative signaling Redox cue Stress tolerance

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