Selection of Cd-excluder rice in Shenyang region of China for food safety

摘要

It is one of very important technologies of phytoremediation using low accumulative plant especially excluder crop to safely product food in contaminated soil. In order to identify some excluder crop cultivars, a pot experiment was conducted to compare Cd accumulation differences among of 26 normal and 4 hybrid rice cultivars (Japonica) in Shenyang region of China for food safety aim. The results showed that only Cd concentration in brown rice of Shendao 4 among of 30 rice cultivars was lower than 0.2 mg kg~(-1) (agricultural trade standard of non-pollution food for rice of China, NY 5115-2008) at a lower level of Cd exposure spiked at 2.5 mg kg~(-1). When soil Cd spiked at 5 mg kg~(-1), Cd concentration in brown rice of Shendao 4 was lower either compared to other cultivars, and its enrichment factors (EFs) and translocation factors (TFs) were lower than 1.0 and 0.5, respectively. Furthermore, the yields of grains and the biomasses of aboveground of Shendao 4 didn't decrease significantly compared to the control (p<0.05), indicating it was a Cd-excluder cultivar. This is a new and important found in Northeast China rice production and may have an important interest in exploring crop exclusion mechanism.