中、轻度污染农田杂交水稻对Cd的吸收和累积分布

Cd Accumulation,Distribution and Transport in Varieties of Hybrid Rice Grown in Medium to Low Cd-polluted Farmland

为比较不同杂交水稻品种对重金属元素镉(Cd)富集能力的差异性,筛选和培育Cd安全水稻品种,实现中、轻度重金属污染农田安全利用。以具有高产优质特性的闽恢3301为亲本的6个“闽恢3301”系列杂交水稻品种为试验材料,开展原位试验,测定其Cd吸收和累积特性。研究结果表明,供试杂交水稻品种生长与产量指标差异不明显,对Cd的吸收积累能力差异显著,其中谷优3301糙米Cd浓度显著低于其他,但仍超出安全标准限值,可结合其他农艺措施进一步降低其糙米Cd浓度。谷优3301表现出优于“闽恢3301系列”杂交水稻其他5品种的籽粒低积累特征,具有中、轻度污染土壤上安全生产的潜力。

To study the differences among varieties of hybrid rice in accumulation of heavy metals,so as to screen and develop cadmium(Cd)pollution-safe rice production materials and safely utilize low Cd-polluted farmland.An in situ test was conducted to investigate the characteristics of Cd accumulation,distribution and transport in six varieties of hybrid rice with the same parent Minhui 3301 which is characterized by high yield and fine quality.The results showed that the six varieties of hybrid rice exhibited the same growth and yield indexes,however the Cd accumulation and distribution in these rice varieties differed significantly.The Cd concentration in brown rice of Guyou3301was found to be lower significantly than that in the other five varieties, but still exceeded safety standards.Combined with other agronomic measures,it was possible to further reduce the brown rice Cd concentration.In conclusion,the brown rice Cd concentration was lower in Guyou3301 than that in the other five varieties of hybrid rice of Minhui 3301 and could be used as potential Cd pollution-safe materials to grow in medium to low Cd-polluted farmland.