Effects of arsenic on nitrate metabolism in arsenic hyperaccumulating and non-hyperaccumulating ferns |
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| Authors: | Nandita Singh Lena Q Ma Joseph C Vu Anshita Raj |
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| Institution: | 1. Soil and Water Science Department, University of Florida, Gainesville, Fl 32611-0290, USA;2. Chemistry Research Unit, CMAVE, USDA-ARS, Gainesville, FL 32608-1069 and Agronomy Department, University of Florida, Gainesville, FL 32611-0500, USA;3. Eco-Auditing group, National Botanical Research Institute, Rana Pratap Marg, Lucknow 226 001, India;1. CENSE, Departamento de Ciências e Engenharia do Ambiente, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal;2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China;1. College of Natural Resources and Environment, Northwest A&F University, Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture, Yangling, 712100 Shaanxi, China;2. Global Centre for Environmental Research, The Faculty of Science and Information Technology, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia;3. Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Mawson Lakes, SA 5095, Australia;1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;2. Qingdao Agricultural University, Qingdao 266109, China |
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| Abstract: | This study investigated the effects of arsenic on the in vitro activities of the enzymes (nitrate reductase and nitrite reductase) involved in nitrate metabolism in the roots, rhizomes, and fronds of four-month old Pteris vittata (arsenic – hyperaccumulator) and Pteris ensiformis (non-arsenic--hyperaccumulator) plants. The arsenic treatments (0, 150, and 300 μM as sodium arsenate) in hydroponics had adverse effects on the root and frond dry weights, and this effect was more evident in P. ensiformis than in P. vittata. Nitrate reductase and nitrite reductase activities of arsenate-treated plants were reduced more in P. ensiformis than in P. vittata. This effect was accompanied by similar decreases in tissue NO3? concentrations. Therefore, this decrease is interpreted as being indirect, i.e., the consequence of the reduced NO3? uptake and translocation in the plants. The study shows the difference in the tolerance level of the two Pteris species with varying sensitivity to arsenic. |
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