title: Mechanisms of Fe biofortification and mitigation of Cd accumulation in rice (Oryza sativa L.) grown hydroponically with Fe chelate fertilization.
abstract: Cadmium contaminated rice from China has become a global food safety issue. Some research has suggested that chelate addition to substrates can affect metal speciation and plant metal content. We investigated the mitigation of Cd accumulation in hydroponically-grown rice supplied with EDTANa2Fe(II) or EDDHAFe(III). A japonica rice variety (Nipponbare) was grown in modified Kimura B solution containing three concentrations (0, 10, 100 μΜ) of the iron chelates EDTANa2Fe(II) or EDDHAFe(III) and 1 μΜ Cd. Metal speciation in solution was simulated by Geochem-EZ; growth and photosynthetic efficiency of rice were evaluated, and accumulation of Cd and Fe in plant parts was determined. Net Cd fluxes in the meristematic zone, growth zone, and maturation zone of roots were monitored by a non-invasive micro-test technology. Expression of Fe- and Cd-related genes in Fe-sufficient or Fe-deficient roots and leaves were studied by QRT-PCR. Compared to Fe deficiency, a sufficient or excess supply of Fe chelates significantly enhanced rice growth by elevating photosynthetic efficiency. Both Fe chelates increased the Fe content and decreased the Cd content of rice organs, except for the Cd content of roots treated with excess EDDHAFe(III). Compared to EDDHAFe(III), EDTANa2Fe(II) exhibited better mitigation of Cd accumulation in rice by generating the EDTANa2Cd complex in solution, decreasing net Cd influx and increasing net Cd efflux in root micro-zones. Application of EDTANa2Fe(II) and EDDHAFe(III) also reduced Cd accumulation in rice by inhibiting expression of genes involved in transport of Fe and Cd in the xylem and phloem. The 'win-win' situation of Fe biofortification and Cd mitigation in rice was achieved by application of Fe chelates. Root-to-stem xylem transport of Cd and redistribution of Cd in leaves by phloem transport can be regulated in rice through the use of Fe chelates that influence Fe availability and Fe-related gene expression. Fe fertilization decreased Cd influx and increased Cd efflux in rice roots.
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Chen
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou 510275, PR China. Electronic address: eestyt@mail.sysu.edu.cn.
authors.forename: Ye-Tao
authors.initials: YT
authors.lastname: Tang
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors.forename: Can
authors.initials: C
authors.lastname: Zhou
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors.forename: Shu-Ting
authors.initials: ST
authors.lastname: Xie
authors.affiliation: School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, PR China.
authors.forename: Shi
authors.initials: S
authors.lastname: Xiao
authors.affiliation: School of BioSciences, The University of Melbourne, Parkville, Victoria 3010, Australia.
authors.forename: Alan J M
authors.initials: AJM
authors.lastname: Baker
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou 510275, PR China. Electronic address: eesqrl@mail.sysu.edu.cn.
authors.forename: Rong-Liang
authors.initials: RL
authors.lastname: Qiu
mesh_terms: D000072759:Biofortification; D002104:Cadmium / Q000378:metabolism*; D004492:Edetic Acid / Q000494:pharmacology; D005029:Ethylenediamines / Q000494:pharmacology; D005296:Ferrous Compounds / Q000494:pharmacology; D005308:Fertilizers; D015870:Gene Expression / Q000187:drug effects; D018527:Hydroponics; D007501:Iron / Q000378:metabolism*; D007502:Iron Chelating Agents / Q000494:pharmacology*; D012275:Oryza / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism; D052585:Phloem / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism; D018547:Plant Stems / Q000187:drug effects / Q000378:metabolism; D052584:Xylem / Q000378:metabolism
chemical_list: D005029:Ethylenediamines; D005296:Ferrous Compounds; D005308:Fertilizers; D007502:Iron Chelating Agents; D002104:Cadmium; C011813:ethylenediamine-N,N'-bis(2-hydroxyphenylacetic acid); C055526:Fe(II)-EDTA; D004492:Edetic Acid; D007501:Iron
keywords: Cadmium; Fe chelates; Fe-related genes; Net Cd flux; Rice