镉胁迫下籼稻和粳稻对镉的吸收、转移和分配研究

Absorption,Transfer and Distribution of Cd in indica and japonica Rice under Cd Stress

采用盆栽试验研究了镉胁迫下,籼稻(CG132R)和粳稻(粳925)在不同生育期对重金属镉的吸收和积累及其镉的分布和转移规律。结果表明,镉由水稻根部向地上部转移能力表现为分蘖期>成熟期。镉胁迫下,CG132R和粳925各器官镉含量都随外源镉含量升高而上升,低镉条件下水稻各器官更容易富集镉。镉在CG132R和粳925植株内分配表现为根>茎>叶>糙米>谷壳,根是水稻吸收和积累镉的主要器官。CG132R糙米镉含量与积累量都高于粳925,其中CG132R籽粒镉积累量为粳925的5倍左右。在对镉的吸收、积累、转移和分配方面,CG132R与粳925存在显著差异。CG132R吸收和积累镉的量较粳925多,且镉转移能力也强于粳925。CG132R糙米镉含量高于粳925是由于CG132R对土壤中镉吸收能力更强,且镉向糙米转移能力也更强。

A pot experiment was conducted to study the absorption,accumulation,distribution and transfer of cadmium （Cd）during various growth stages of indica （CG1 32R）and japonica rice（Jing 925 ）under Cd stress.Results showed that the transfer ability of Cd from root to aboveground parts during the tillering stage was stronger than that during the maturity stage.With the increasing concentration of exogenous Cd,the Cd content in different organs of CG1 32R and Jing 925 increased.Under low soil Cd content,rice plant organs enriched Cd more easily.The proportion of Cd distribution in CG1 32R and Jing 925 was as follows：root 〉 stem 〉 leaf 〉 brown rice 〉 rice husk.The root was the primary organs of the rice in Cd absorption and accumulation.The Cd content and accumulation in brown rice was 500% as higher in CG1 32R than that in Jing 925 .Further investigation showed that there was a significant difference between CG1 32R and Jing 925 in Cd absorption,accumulation,transfer and distribution.CG1 32R had stronger capabilities of absorption,accumulation and transfer of Cd than Jing 925 .Higher concentration of Cd in brown rice of CG1 32R contributed to more stronger capability in absorption and transfer of Cd than that of Jing 925 .