Abscisic acid priming regulates arsenite toxicity in two contrasting rice (Oryza sativa L.) genotypes through differential functioning of sub1A quantitative trait loci. (15th October 2021)

• Record Type: Journal Article
• Authors: Saha, Indraneel; Hasanuzzaman, Mirza; Adak, Malay Kumar
• Is Part Of: Environmental pollution. Volume 287(2021)
• Publication Date: 2021-10-15
• Subjects: Cellular redox -- Chemical priming -- H+/ATPase -- Metalloid toxicity -- Non-protein thiol -- Phosphate metabolism -- Rice; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2021.117586
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Arsenite [As(III)] toxicity causes impeded growth, inadequate productivity of plants and toxicity through the food chain. Using various chemical residues for priming is one of the approaches in conferring arsenic tolerance in crops. We investigated the mechanism of abscisic acid (ABA)-induced As(III) tolerance in rice genotypes (cv. Swarna and Swarna Sub1) pretreated with 10 μM of ABA for 24 h and transferred into 0, 25 and 50 μM arsenic for 10 days. Plants showed a dose-dependent bioaccumulation of As(III), oxidative stress indicators like superoxide, hydrogen peroxide, thiobarbituric acid reactive substances and the activity of lipoxygenase. As(III) had disrupted cellular redox that reflecting growth indices like net assimilation rate, relative growth rate, specific leaf weight, leaf mass ratio, relative water content, proline, delta-1-pyrroline-5-carboxylate synthetase and electrolyte leakage. ABA priming was more protective in cv. Swarna Sub1 than Swarna for retrieval of total glutathione pool, non-protein thiols, cysteine, phytochelatin and glutathione reductase. Phosphate metabolisms were significantly curtailed irrespective of genotypes where ABA had moderated phosphate uptake and its metabolizing enzymes like acid phosphatase, alkaline phosphatase and H + /ATPase. Rice seedlings had regulated antioxidative potential with the varied polymorphic expression of those enzymes markedly with antioxidative enzymes. The results have given the possible cellular and physiological traits those may interact with ABA priming in the establishment of plant tolerance with As(III) over accumulation and, thereby, its amelioration for oxidative damages. Finally, cv. Swarna Sub1 was identified as a rice genotype as a candidate for breeding program for sustainability against As(III) stress with cellular and physiological traits serving better for selection pressure. Graphical abstract: Image 1 Highlights: As(III) toxicity is more aligned to P depletion through plasma membrane. ABA can stimulate H + /ATPase in exchange of P uptake. GSH metabolism is an important cellular trait in As(III) tolerance. ABA can support compatible solute development in sub1A QTL against As(III) stress. Genetic polymorphism is attributed for better tolerance under As(III) accumulation. Abstract : As(III) toxicity causes oxidative stress and decline growth and metabolism of rice plant. However, priming with ABA stimulates H + /ATPase in exchange of phosphate uptake, enhances antioxidant defense and improves plant metabolism.