title: Effects of different warming patterns on the translocations of cadmium and copper in a soil-rice seedling system.
abstract: Heavy-metal-polluted rice poses potential threats to food security and has received great attention in recent years, while how elevated temperature affects the translocation of heavy metals in soil-rice system is unclear. In this study, potting experiments were conducted in plant growth chambers for 24 days to evaluate the effects of different warming patterns on cadmium (Cd) and copper (Cu) migrations in soil-rice seedling system. Rice seedlings were cultivated under four different day/night temperature patterns: 25/18 °C (CK), 25/23 °C (N5), 30/18 °C (D5), and 30/23 °C (DN5), respectively. Non-contaminated soil (CS), Cd/Cu lightly polluted soil (LS), and highly polluted soil (HS) were chosen for experiments. The results showed that different warming patterns decreased soil pH and elevated available soil Cd/Cu concentrations. The shoot and root biomass were increased by 39.0-320 and 28.6-348 %, respectively. Warming induced significant (p < 0.05) increase of Cd/Cu uptake and translocation in rice seedlings, especially for the Cd concentration in shoot. The Cd concentrations of shoot increased by 5-12 times and up to 8 times for LS and HS, respectively. Meanwhile, the Cd concentration of shoot increased with warming while that of root kept unchanged, indicating that warming promoted cadmium translocation from root to shoot (about -four to nine times of CK), while warming changed the Cu concentration of shoot similarly to that of root and had no significant effects on Cu translocations in rice seedlings. Our study may provide improved understanding for Cd/Cu fates in soil-rice system by warming and imply that heavy metals had the higher environmental risk under the future global warming.
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing, 210008, China. lqge@issas.ac.cn.|University of Chinese Academy of Sciences, No. 19 Yuquan Road, Beijing, 100049, China. lqge@issas.ac.cn.
authors.forename: Liqiang
authors.initials: L
authors.lastname: Ge
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing, 210008, China. canglong@issas.ac.cn.
authors.forename: Long
authors.initials: L
authors.lastname: Cang
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing, 210008, China. liuhui213@issas.ac.cn.|University of Chinese Academy of Sciences, No. 19 Yuquan Road, Beijing, 100049, China. liuhui213@issas.ac.cn.
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing, 210008, China. dmzhou@issas.ac.cn.
authors.forename: Dongmei
authors.initials: D
authors.lastname: Zhou
mesh_terms: D001692:Biological Transport; D018533:Biomass; D002104:Cadmium / Q000378:metabolism*; D003300:Copper / Q000378:metabolism*; D012275:Oryza / Q000254:growth & development* / Q000378:metabolism*; D018517:Plant Roots / Q000378:metabolism; D036226:Seedlings / Q000378:metabolism*; D012987:Soil; D012989:Soil Pollutants / Q000378:metabolism; D013696:Temperature
chemical_list: D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D003300:Copper
keywords: Cadmium; Copper; Rice seedlings; Translocation; Warming patterns