Variations of Cd,Cu,Zn Accumulation Among Rice Cultivars

Heavy metal contaminated paddy soils resulted from irrigation with acid mine drainage were used in pot experiment to study the accumulation differences of Cd,Cu and Zn in brown rice of 21 rice cultivars,between conventional variety and hybrid rice variety,between three and two line hybrid rice,between rice with different genetic backgrounds.The results showed that concentrations of Cd,Cu and Zn in brown rice of 21 rice cultivars varied within the range of 0.006～0.092 mg·kg-1(more than 15-fold),6.712～27.117 mg·kg-1(more than 4-fold),28.39～43.296 mg·kg-1,respectively.There was no significant difference in Cd,Cu,Zn concentration in brown rice between conventional rice and hybrid rice.The concentrations of Cd and Cu in brown rice of three line hybrid rice were significantly higher than those of two line hybrid rice.However,the concentrations of Zn in brown rice of three line hybrid rice were significantly lower than those of two line hybrid rice.There were also significantly different in Cd,Cu and Zn concentration in brown rice between rice with different genetic backgrounds.The correlation analysis results showed there was significant and positive correlation between Cu and Cd concentration,significant and negative correlation between Cu and Zn concentration in brown rice.However,there was no significant correlation between Cd and Zn concentration.