科研之友
微信
新浪微博
Facebook
分享链接
摘要
Hydroponic and field experiments were conducted to explore the Pb absorption and accumulation ability of two cultivars of rapes, QinYou No.1 (QY-1) and SanYueHuang (SYH). The subcellular compartmentalization of Pb and antioxidant enzyme activities were determined to clarify the differences in Pb tolerance and detoxification mechanisms between the two cultivars of rapes. The results showed that SYH was higher than QY-1 in the growth under different Pb stress concentrations. Both cultivars of rapes tend to distribute Pb in root rather than shoot under hydroponic conditions. Meanwhile, under 20mg/L Pb stress, Pb concentrations in root and shoot of SYH were significantly higher than QY-1by 17.03% and 77.07%, respectively. Moreover, the results of Pb subcellular compartmentalization in leaves of the two cultivars of rapes showed that the enrichment of Pb in biological detoxified metal factions (heat stable protein and metal-rich granule) played an important role in the detoxification of the two cultivars of rapes, which was significantly higher in SYH than QY-1. In addition, antioxidant system also played an important role in the detoxification of Pb. Peroxidase activity and catalase activity in leave of SYH were significantly higher than QY-1, which implied that SYH possess advantages to cope with Pb stresses over QY-1. In the field experiment, Pb could be translocated to aboveground part more effectively compared with hydroponic conditions. Moreover, bioconcentration factor (BCF) and Pb concentrations in both shoot and root of SYH were significantly higher than those of QY-1. Therefore, SYH has higher Pb accumulation ability and thus more suitable for the remediation of mildly and moderately Pb contaminated farmland soils.
- 单位
