Uptake and Translocation of Cadmium and Its Physiological Effects in Two Rice Cultivars Differed in Grain Cadmium Concentration
LI Peng1, 2; GE Ying1,*; WU Long-hua2,*; SHEN Li-bo2; TAN Wei-na2; LUO Yong-ming2
1College of Resources and Environment Sciences, Nanjing Agricultural University, Nanjing 210095, China; 2Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; *Corresponding authors, E-mail: firstname.lastname@example.org; email@example.com
A hydroponic experiment and a pot experiment were conducted to investigate Cd uptake and translocation in rice and their physiological effects at several growth stages by using two rice cultivars with different grain Cd concentrations. In the pot experiment, the grain Cd contents of low Cd rice cultivar(A16) and high Cd cultivar(A54) were 0.31 mg/kg and 0.88 mg/kg, respectively at a total soil Cd concentration of 1.57 mg/kg. Both hydroponic and pot experiments showed that A16 absorbed and translocated more Cd than A54 at the seedling stage. However, after the seedling stage, the amounts of Cd uptake and translocation by A54 were higher than those of A16. By comparing Cd accumulation in two rice cultivars at various growth stages, the highest increase in Cd accumulation was observed at seedlingelongation stage. The amount of nonprotein thiol(NPT) was not only closely related to Cd stress, but also partly controlled Cd translocation from roots to shoots, thus affecting the Cd concentration in rice grain. According to Cd and NPT contents in shoots and roots of the two rice cultivars at each growth stage, it may be speculated that the variation of grain Cd concentration was largely controlled by root uptake and translocation to shoot. Root Cd sequestration and rhizosphere soil properties may result in the differences in rice Cd absorption and translocation between the seedling stage and other stages.
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