Sensitivity of Nicotiana tabacum L. accumulating cadmium at its vigorous growth stage
KONG Xiang-fang1, WEI Shu-he2, ZHAO Ji-rong1, DAI Hui-ping1, JIA Gen-liang3
1. College of Biological Science & Engineering, Shaanxi University of Technology, Hanzhong 723001, China; 2. Key Laboratory of Pollution Ecology and Environment Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 3. College of Science, Northwest A & F University, Yangling 712100, China
Abstract：Pot experiments were conducted to reveal the characteristics of cadmium (Cd) accumulation in Nicotiana tabacum L. (Yunyan 99) at vigorous stage and the response of physiological indexes like photosynthesis to Cd stress. The results showed that the enrichment factor (ratio of Cd concentration in plant to soil) and translocation factor (ratio of Cd concentration in shoot to root) of Cd in tobacco stems, leaves and shoots were all greater than 1, but the Cd concentration of them did not reach the critical content standard of 100mg/kg in the treatments of 4.43mg/kg, 7.94mg/kg, 17.33mg/kg or 49.79mg/kg Cd in soils. When the Cd concentration in soil was 4.43mg/kg, the tolerance of tobacco was stronger. When soil Cd content was higher than 7.94mg/kg, tobacco biomass, photosynthetic pigment content, net photosynthetic rate, transpiration rate, stomatal conductance and SOD activity were significantly decreased (P<0.05), while intercellular CO2 and MDA content was significantly increased (P<0.05). It is suggested that tobacco is sensitive to Cd accumulation in vigorous period, and should be planted far away from Cd contaminated soil or soil with high Cd background value.
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