title: Rapid activation of catalase followed by citrate efflux effectively improves aluminum tolerance in the roots of chick pea (Cicer arietinum).
abstract: The present study demonstrates the comparative response of two contrasting genotypes (aluminum (Al) tolerant and Al sensitive) of chick pea (Cicer arietinum) against Al stress. The Al-tolerant genotype (RSG 974) showed lesser inhibition of root growth as well as lower oxidative damages, measured in terms of the accumulation of H2O2 and lipid peroxidation compared to the Al-sensitive genotype (RSG 945). The accumulation of Al by roots of both genotypes was almost equal at 96 and 144 h after Al treatment; however, it was higher in Al-tolerant than Al-sensitive genotype at 48 h after Al treatment. Further, the Al-mediated induction of superoxide dismutase (SOD) activity was significantly higher in Al-tolerant than Al-sensitive genotype. Ascorbate peroxidase (APX) activity was almost similar in both genotypes. Al treatment promptly activated catalase activity in Al-tolerant genotype, and it was remarkably higher than that of Al-sensitive genotype. As another important Al detoxification mechanism, citrate efflux was almost equal in both genotypes except at 1000 μM Al treatment for 96 and 144 h. Further, citrate carrier and anion channel inhibitor experiment confirmed the contribution of citrate efflux in conferring Al tolerance in Al-tolerant genotype. Based on the available data, the present study concludes that rapid activation of catalase (also SOD) activity followed by citrate efflux effectively improves Al tolerance in chick pea.
authors.affiliation: Department of Bioscience and Biotechnology, Banasthali University, Banasthali, 304022, Rajasthan, India.
authors.forename: Manorma
authors.initials: M
authors.lastname: Sharma
authors.affiliation: Department of Bioscience and Biotechnology, Banasthali University, Banasthali, 304022, Rajasthan, India.
authors.forename: Vinay
authors.initials: V
authors.lastname: Sharma
authors.affiliation: Department of Bioscience and Biotechnology, Banasthali University, Banasthali, 304022, Rajasthan, India. bhuminathtripathi@hotmail.com.|Department of Botany, Guru Ghasidas University, Bilaspur, 495009, Chhattisgarh, India. bhuminathtripathi@hotmail.com.|Academy of Innovative Research, Bemawal (Ambedkarnagar), 224181, Uttar Pradesh, India. bhuminathtripathi@hotmail.com.
authors.forename: Bhumi Nath
authors.initials: BN
authors.lastname: Tripathi
mesh_terms: D000535:Aluminum / Q000493:pharmacokinetics / Q000633:toxicity*; D060387:Ascorbate Peroxidases / Q000378:metabolism; D002374:Catalase / Q000378:metabolism*; D029863:Cicer / Q000187:drug effects* / Q000235:genetics / Q000502:physiology; D019343:Citric Acid / Q000378:metabolism; D004789:Enzyme Activation / Q000187:drug effects; D005838:Genotype; D006861:Hydrogen Peroxide / Q000378:metabolism; D008658:Inactivation, Metabolic; D015227:Lipid Peroxidation / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects / Q000235:genetics; D018517:Plant Roots / Q000187:drug effects* / Q000235:genetics; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D019343:Citric Acid; D006861:Hydrogen Peroxide; D000535:Aluminum; D060387:Ascorbate Peroxidases; D002374:Catalase; D013482:Superoxide Dismutase
keywords: Aluminum (Al) stress; Antioxidants; Chick pea; Organic acid; Oxidative stress