Comparison of norflurazon absorption by excised roots of three plant species |
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| Institution: | 1. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Science, 511 Kehua Street, Wushan, Tianhe District, Guangzhou 510640, Guangdong, China;2. Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, University of Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain;3. College of Natural Resources and Environment, South China Agricultural University, 483 Wushan Road, Tianhe District, Guangzhou 510642, China;4. Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain;1. Norwegian Geotechnical Institute (NGI), 0484 Oslo, Norway;2. Norwegian University of Life Sciences (NMBU), 1430 Ås, Norway;3. Lindum AS, 3036 Drammen, Norway;4. Norwegian University of Science and Technology (NTNU), 7024 Trondheim, Norway;5. VEAS, Bjerkåsholmen 125, 3470 Slemmestad, Norway;6. University of Florida, Gainesville, FL, USA;1. College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China;2. State Key Laboratory of Organic Geochemistry and Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;3. CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China;4. The Environmental Research Institute, South China Normal University, Guangzhou 510631, China |
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| Abstract: | The absorption of norflurazon by 1-cm segments cut from the apical 5-cm roots of sicklepod (Cassia obtusifolia L.), corn (Zea mays L. cv. Sunbelt 1860), and cotton (Gossyipium hirsutum L. cv. DPL 90) was investigated. Norflurazon absorption by all root tissues was rapid in the first 10 min but there was very little increase thereafter up to 60 min. Norflurazon also penetrated the entire root tissue volume within 30 min, indicating its movement into both the apoplast and the symplast of root cells by simple diffusion. The initial (0–10 min) rate of norflurazon absorption was faster in sicklepod and cotton than in corn. Corn also accumulated less 14C than did the other species. Norflurazon diffused freely out of sicklepod and corn root tissues but not out of cotton roots. Metabolism was not the basis for this differential retention as norflurazon was not degraded by the root tissues over a 24-hr period. These experiments show that differential accumulation and retention of norflurazon by root tissues was not related to the selectivity of this herbicide among these three species. |
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