title: Impact of silicon on Indian mustard (Brassica juncea L.) root traits by regulating growth parameters, cellular antioxidants and stress modulators under arsenic stress.
abstract: Arsenic (As) is an emerging pollutant causing inhibition in growth and development of plants resulting into phytotoxicity. On the other hand, silicon (Si) has been suggested as a modulator in abiotic and biotic stresses that, enhances plant's physiological adaptations in response to several stresses including heavy metal stress. In this study, we used roots of hydroponically grown 14 day old seedlings of Brassica juncea var. Varuna treated with 150 μM As, 1.5 mM Si and both in combination for 96 h duration. Application of Si modulated the effect of As by improving morphological traits of root along with the development of both primary and lateral roots. Changes observed in root traits showed positive correlation with As induced cell death, accumulation of reactive oxygen species (ROS), nitric oxide (NO) and intracellular superoxide radicals (O2(-)). Addition of 1.5 mM Si during As stress increased accumulation of As in roots. Mineral nutrient analysis was done using energy-dispersive X-ray fluorescence (EDXRF) technique and positively correlated with increased cysteine, proline, MDA, H2O2 and activity of antioxidant enzymes (SOD, CAT and APX). The results obtained from the above biochemical approaches support the protective and active role of Si in the regulation of As stress through the changes in root developmental process.
authors.affiliation: Ecotoxicogenomics Lab, Department of Biotechnology, Jamia Millia Islamia, New Delhi, 25, India.
authors.forename: Chandana
authors.initials: C
authors.lastname: Pandey
authors.affiliation: Ecotoxicogenomics Lab, Department of Biotechnology, Jamia Millia Islamia, New Delhi, 25, India.
authors.forename: Ehasanullah
authors.initials: E
authors.lastname: Khan
authors.affiliation: Ecotoxicogenomics Lab, Department of Biotechnology, Jamia Millia Islamia, New Delhi, 25, India.
authors.forename: Medha
authors.initials: M
authors.lastname: Panthri
authors.affiliation: CSIR, National Botanical Research Institute, Rana Pratap Marg, Lucknow, U.P., India.
authors.forename: Rudra Deo
authors.initials: RD
authors.lastname: Tripathi
authors.affiliation: Ecotoxicogenomics Lab, Department of Biotechnology, Jamia Millia Islamia, New Delhi, 25, India. Electronic address: meetu_gpt@yahoo.com.
authors.forename: Meetu
authors.initials: M
authors.lastname: Gupta
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D001151:Arsenic / Q000633:toxicity*; D016923:Cell Death / Q000187:drug effects; D003545:Cysteine / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008903:Minerals / Q000378:metabolism; D009149:Mustard Plant / Q000187:drug effects / Q000502:physiology*; D009569:Nitric Oxide / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects; D010641:Phenotype; D018517:Plant Roots / Q000033:anatomy & histology / Q000187:drug effects / Q000254:growth & development*; D011392:Proline / Q000378:metabolism; D019655:Quantitative Trait, Heritable; D012825:Silicon / Q000494:pharmacology*; D013312:Stress, Physiological / Q000187:drug effects*; D013481:Superoxides / Q000378:metabolism
chemical_list: D000975:Antioxidants; D008903:Minerals; D013481:Superoxides; D009569:Nitric Oxide; D011392:Proline; D006861:Hydrogen Peroxide; D003545:Cysteine; D001151:Arsenic; D012825:Silicon
keywords: Arsenic; Brassica juncea; Nitric oxide; Reactive oxygen species; Silicon