不同品种水稻糙米对Cd Cu Zn积累特性的研究

Variations of Cd,Cu,Zn Accumulation Among Rice Cultivars

以酸性矿山废水污染的含有多种重金属的农田土壤为供试土壤,通过盆栽实验,研究不同水稻品种,不同类型、不同遗传背景水稻糙米重金属Cd、Cu、Zn的积累差异。结果表明,供试水稻糙米Cd含量为0.006～0.092mg·kg-1,最高值和最低值相差15倍;Cu含量为6.712～27.117mg·kg-1,最高值和最低值相差4倍;Zn含量为28.390～43.296mg·kg-1,最高值和最低值相差不到1倍。常规稻和杂交稻糙米的Cd、Cu、Zn含量差异不明显。三系杂交稻的糙米Cd、Cu含量极显著高于二系杂交稻,而二系杂交稻糙米中Zn含量则显著高于三系杂交稻。不同遗传背景水稻品种糙米Cd、Cu、Zn含量也存在明显差异。相关分析结果表明,糙米中Cu、Cd含量间呈极显著正相关,Cu、Zn含量之间存在显著负相关,而Cd、Zn含量间的相关性不明显。

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.