农业环境科学学报Issue(12)：2288-2295,8.DOI:10.11654/jaes.2014.12.002
Cd胁迫对水稻亲本材料Cd吸收分配的影响
Effects of Cadmium Stress on Uptake and Distribution of Cadmium in Different Rice Varieties
摘要
Abstract
It is important to minimize the influx of cadmium(Cd)to the human food chain. Here the characteristics of uptake and distribu-tion of Cd in a pollution-safe rice variety were studied in a pot experiment to provide Cd safety rice germplasm resources. Cadmium pollu-tion-safe rice variety was D62B, and common variety Luhui17 as the control. Cadmium concentrations used were 1 mg·kg-1, 4 mg·kg-1, and 16 mg·kg-1. Compared with Luhui 17, D62B growth was inhibited to some extent at all Cd levels. The biomass of D62B significantly de-creased with increasing Cd concentrations. The Cd concentrations in shoot and translation coefficient of D62B were significantly lower than those of Luhui17 during the growth periods. At mature stage, the Cd concentrations in brown rice and chaff were also significantly lower than those of Luhui17. At 1 mg Cd·kg-1 and 4 mg Cd·kg-1, the Cd concentrations in brown rice of D62B were lower than the National Food Safe-ty Standards(0.2 mg·kg-1). The rates of Cd uptake by D62B were the greatest at tillering stage, and increased as Cd concentrations in-creased. The Cd translocation rate of D62B was significantly lower than that of Luhui17 at 4 mg·kg-1 and 16 mg·kg-1. At mature stage, the Cd translocation of D62B was only 46.52%and 66.68%of that of Luhui17 at 4 mg·kg-1 and 16 mg·kg-1. Cadmium absorbed by D62B accu-mulated about 44%~49%in cell walls and about 37%in soluble fraction, and the lowest in cellular organelles, while more than 48%of Cd in Luhui17 was localized in soluble fraction. In roots, majority of Cd was located in soluble fraction and cell walls, but percentages of Cd in cell wall was significantly lower in Luhui 17 than D62B at 16 mg·Cd kg-1. In conclusion, Cd pollution-safe rice variety D62B has low accu-mulation of Cd in brown rice, and could be considered as Cd safety rice germplasm resources for Cd-polluted farmlands.关键词
水稻/Cd安全亲本材料/吸收/转运/亚细胞分布Key words
rice/Cd pollution-safe plant/uptake/translocation/subcellular distribution分类
资源环境引用本文复制引用
张路,张锡洲,李廷轩,余海英,戢林..Cd胁迫对水稻亲本材料Cd吸收分配的影响[J].农业环境科学学报,2014,(12):2288-2295,8.基金项目
四川省科技支撑计划（2013NZ0044）；四川省科技支撑计划（2014NZ0008）；四川省教育厅项目（14ZB0017）；四川农业大学“211工程”双支计划项目资助 （）
