水稻镉、铅、砷低含量基因型的筛选

筛选低重金属含量水稻品种或减少水稻对种植土壤中重金属的吸收是控制稻米重金属含量的最直接有效的办法.本研究采用ICP-MS法测定了78份水稻品种的糙米中镉(Cd)、铅(Pb)、砷(As)含量.同时比较其中的20份品种在3个试验点的糙米Cd,Pb,As含量.结果表明:水稻籽粒中Cd,Pb,As的积累存在着明显的品种差异,其中Cd和Pb积累的基因型明显较As积累的基因型丰富；相关性分析表明,糙米中Cd和Pb含量存在极显著相关性(P＜0.01)；筛选得到Cd,Pb含量低的基因型5个,Cd,As含量低的基因型1个,As,Pb含量低的基因型2个,Cd,Pb,As含量均低的基因型1个；土壤Cd,Pb,As含量对糙米Cd,Pb,As含量有较明显的影响；且糙米Cd,Pb和As含量对土壤环境的反应也各不相同.

Screening for rice(Oryza sativa L.) genotyeps with lower Cd,Pb and As contents

It is a direct and efficient way of screening for rice genotypes with lower Cd,Pb and As contents to decrease the absorption of heavy metals and control the heavy metals contents in rice.Total grain cadmium(Cd),plumbum(Pb) and arsenic(As) contents of brown rice were determined for 78 varieties grown in Zhejiang Province using ICP-MS analysis.Simultaneously,20 varieties from 78 varieties were grown in three field trials with different Cd,Pb and As content.The results showed that there was remarkable difference in Cd,Pb and As accumulation in brown rice among varieties,and there were more polymorphisms in genotypes of Cd and Pb concentration than As concentration.Correlation analysis showed that Cd content in brown rice had significant correlation with Pb content(P<0.01).Out of 78 varieties,we obtained five genotypes with low Cd concentration and low Pb concentration in brown rice,one genotype of low Cd and low As,two genotypes of low As and low Pb,and only one genotype of low Cd,Pb and As in brown rice.T test showed that environments had significant influence on Cd,Pb and As in brown rice.Cd,Pb and As showed diverse reaction to growth environments.