The uptake and distribution of 15N2 into the various organs of Typha latifolia L. |
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| Institution: | 1. The Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geosciences, Shijiazhuang 050061, China;2. Key Laboratory of Groundwater Sciences and Engineering, Ministry of Natural Resources, Shijiazhuang 050061, China;3. Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan, 430074 Hubei, China;1. Department of Energy Conversion and Storage, Technical University of Denmark, Risø Campus Frederiksborgvej 399, DK-4000, Roskilde, Denmark;2. Department of Chemistry, University of Calgary, 2500 University Dr., NW, Calgary, Alberta T2N 1N4, Canada;1. Cellular Therapy and Hematopoietic Transplant Unit, Hematology Department, Virgen de la Arrixaca Clinical University Hospital, IMIB-Arrixaca, University of Murcia, Murcia, Spain;2. School of Dentistry, Faculty of Medicine, University of Murcia, Murcia, Spain;3. Department of Stomatology, Universitat de Valencia, Valencia, Spain;1. Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Republic of Korea;2. Department of Industrial Chemistry, Alagappa University, Karaikudi, 630003, India;1. Leibniz Institute of Polymer Research Dresden, Max Bergmann Center of Biomaterials Dresden, Center for Regenerative Therapies Dresden, Hohe Straße 6, 01069 Dresden, Saxony, Germany;2. School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, 2 George Street, Brisbane, Queensland 4000, Australia;3. Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, Queensland 4059, Australia;1. Department of Pharmaceutical Technology, Faculty of Pharmacy, Silpakorn University, Nakhon Pathom 73000, Thailand;2. Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Songkhla 90112, Thailand;3. Medical Products Innovations from Polymers in Clinical Use Research Unit, Prince of Songkla University, Songkhla 90112, Thailand |
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| Abstract: | Direct evidence of heterotrophic dinitrogen fixation associated with the emergent aquatic angiosperm, Typha latifolia L., was obtained through the exposure of actively growing plants to 15N2 gas for 7 days in a gas-tight exposure vessel. Highest enrichments of 15N were found in roots/rhizomes and leaf bases. Slight enrichments were also found in the leaves due to translocation from the roots, rhizomes and leaf bases. Total fixed 15N values were 71.8 μg for the plant and 49.1 μg for the soil.Plants growing in silica sand, which received a nutrient solution containing combined nitrogen, exhibited higher enrichments and fixed 86% more 15N after exposure to 15N2 gas than plants which received a nutrient solution lacking combined nitrogen. It is hypothesized that the concentration of combined nitrogen added was insufficient to repress nitrogen fixation and resulted in an increase in nitrogen fixation by associated microorganisms.Propane was used to trace the loss and movement of gases from the 15N2 vessel and between the upper leaf chamber and the lower root chamber. Gas was rapidly exchanged between the upper and lower chambers through the leaves and roots of T. latifolia. Further investigations showed that propane moved at a rate of 1223 μmol day−1 from the leaves to the roots and 2652 μmol day−1 from the roots to the leaves. These data demonstrated that gases diffuse rapidly through the plant body of T. latifolia. |
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