title: Reduced arsenic accumulation in rice (Oryza sativa L.) shoot involves sulfur mediated improved thiol metabolism, antioxidant system and altered arsenic transporters.
abstract: Arsenic (As) contamination in rice is at alarming level as majority of rice growing regions are As contaminated such as South East Asia. Restricting the As in aerial parts of rice plant may be an effective strategy to reduce As contamination in food chain. Sulfur (S), an essential element for plant growth and development, plays a crucial role in diminishing heavy metal toxicity. Current study is designed to investigate the role of S to mitigate As toxicity in rice under different S regimes. High S (5 mM) treatment resulted in enhanced root As accumulation as well as prevented its entry in to shoot. Results of thiol metabolism indicate that As was complexed in plant roots through enhanced synthesis of phytochelatins. High S treatment also reduced the expression of OsLsi1 and OsLsi2, the potent transporters of As in rice. High S treatment enhanced the activities of antioxidant enzymes and mitigated the As induced oxidative stress. Thus from present study it is evident that proper supply of S nutrition may be helpful in prevention of As accumulation in aerial parts of plant as well as As induced toxicity.
authors.affiliation: CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow 226001, Uttar Pradesh, India.
authors.forename: Garima
authors.initials: G
authors.lastname: Dixit
authors.affiliation: CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow 226001, Uttar Pradesh, India.
authors.forename: Amit Pal
authors.initials: AP
authors.lastname: Singh
authors.affiliation: Department of Botany, University of Lucknow, Lucknow, India.
authors.forename: Amit
authors.initials: A
authors.lastname: Kumar
authors.affiliation: CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow 226001, Uttar Pradesh, India.
authors.forename: Seema
authors.initials: S
authors.lastname: Mishra
authors.affiliation: CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow 226001, Uttar Pradesh, India.
authors.forename: Sanjay
authors.initials: S
authors.lastname: Dwivedi
authors.affiliation: CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow 226001, Uttar Pradesh, India.
authors.forename: Smita
authors.initials: S
authors.lastname: Kumar
authors.affiliation: CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow 226001, Uttar Pradesh, India.
authors.forename: Prabodh Kumar
authors.initials: PK
authors.lastname: Trivedi
authors.affiliation: CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow 226001, Uttar Pradesh, India.
authors.forename: Vivek
authors.initials: V
authors.lastname: Pandey
authors.affiliation: CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow 226001, Uttar Pradesh, India. Electronic address: tripathird@gmail.com.
authors.forename: Rudra Deo
authors.initials: RD
authors.lastname: Tripathi
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D001151:Arsenic / Q000378:metabolism*; D026901:Membrane Transport Proteins / Q000378:metabolism*; D012275:Oryza / Q000378:metabolism*; D018520:Plant Shoots / Q000378:metabolism*; D013438:Sulfhydryl Compounds / Q000378:metabolism; D013455:Sulfur / Q000378:metabolism*
chemical_list: D000975:Antioxidants; D026901:Membrane Transport Proteins; D013438:Sulfhydryl Compounds; D013455:Sulfur; D001151:Arsenic
keywords: Arsenic; Rice; Sulfate and arsenic transporters; Sulfur; Thiol metabolism