caa a22 4500 606219943 CHVBK 20210128101121.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s11104-015-2537-y doi (NATIONALLICENCE)springer-10.1007/s11104-015-2537-y The role of root anatomy, organic acids and iron plaque on mercury accumulation in rice [Elektronische Daten] [Xun Wang, Nora Tam, Huaidong He, Zhihong Ye] Background and aims: Rice contaminated by mercury [Hg, especially methylmercury (MeHg)] has given rise to great concern in recent years. This study investigated variations in ecophysiological features (anatomy, organic acid secretions, Fe plaque formation) of rice roots and their effects on the uptake and accumulation of total mercury (THg) and MeHg by rice plants. Methods: The development of apoplastic barriers in roots of four rice cultivars was observed by a hydroponic experiment while the concentrations of five organic acids, Fe and THg in Fe plaque were determined using a rhizobag trial with different Hg treatments. Results: Cultivars with low Hg accumulation tended to develop strong apoplastic barriers in endodermis, secrete less organic acids and form more Fe plaque on root surfaces and in rhizosphere. Fe concentrations were positively correlated with THg concentrations in rhizosphere's Fe plaque (R2 = 0.60, P < 0.01), whereas the latter was negatively correlated with bioavailable Hg concentrations in rhizosphere (R2 = 0.40, P < 0.01). Conclusions: Organic acids and Fe plaque formation of rice roots play important roles in Hg uptake and accumulation. The development of apoplastic barriers in root restricts Hg uptake but the significance of suberin deposition on Hg uptake needs further investigations. Springer International Publishing Switzerland, 2015 Cultivar variation nationallicence Root anatomy nationallicence Organic acids nationallicence Iron plaque nationallicence Mercury nationallicence methylmercury nationallicence Oryza sativa L nationallicence Wang Xun State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, 510006, Guangzhou, People's Republic of China aut Tam Nora Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong, SAR, People's Republic of China aut He Huaidong State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, 510006, Guangzhou, People's Republic of China aut Ye Zhihong State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, 510006, Guangzhou, People's Republic of China aut Plant and Soil Springer International Publishing 394/1-2(2015-09-01), 301-313 0032-079X 394:1-2<301 2015 394 11104 https://doi.org/10.1007/s11104-015-2537-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-015-2537-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Xun State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, 510006, Guangzhou, People's Republic of China aut NATIONALLICENCE 700 1- Tam Nora Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong, SAR, People's Republic of China aut NATIONALLICENCE 700 1- He Huaidong State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, 510006, Guangzhou, People's Republic of China aut NATIONALLICENCE 700 1- Ye Zhihong State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, 510006, Guangzhou, People's Republic of China aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 394/1-2(2015-09-01), 301-313 0032-079X 394:1-2<301 2015 394 11104