| 硒对水稻吸收积累和转运锰、铁、磷和硒的影响 |
| 摘要点击 1978 全文点击 1220 投稿时间：2013-01-24 修订日期：2013-03-05 |
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| 中文关键词 水稻 硒 锰 铁膜 土壤 |
| 英文关键词 rice Se Mn iron plaque soil |
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| 中文摘要 |
| 采用土壤盆栽法研究硒对水稻吸收积累和转运锰、铁、磷和硒的影响. 结果表明,土壤添加 Se可导致水稻铁膜、根系、茎叶、谷壳和糙米中 Se含量显著提高,水稻茎叶、谷壳和糙米中Mn含量显著降低. 当土壤添加 0.5 mg·kg-1 Se和1.0 mg·kg-1 Se时,水稻茎叶 Mn含量分别比对照处理降低 32.2%和 35.0%,谷壳 Mn含量分别降低 22.0%和 42.6%,糙米 Mn含量分别降低 27.5%和 28.5%. Se对水稻各部位的 P和 Fe(除谷壳外)含量影响不大. 土壤添加 Se对水稻铁膜、根系、茎叶和谷壳向糙米转运 P和Fe的影响均不显著,但 Se添加可以显著地降低水稻铁膜和根系向糙米中转运 Mn的能力. 与对照相比,土壤添加 1.0 mg·kg-1Se 导致 Mn由铁膜和根系向糙米中的转运系数分别降低 38.9%和37.9%. 添加 Se对水稻铁膜、根系、茎叶、谷壳和糙米中 Mn、Fe、P和Se的分配比率也产生不同程度的影响. 研究结果暗示可通过土壤添加 Se来减少水稻对 Mn的吸收积累和转运,从而降低 Mn通过食物链途径对人体健康造成危害. |
| 英文摘要 |
| A pot experiment was conducted to clarify the effect of selenium on the uptake and translocation of manganese (Mn), iron (Fe), phosphorus (P) and selenium (Se) in rice (Oryza sativa L.). The results showed that addition of Se led to the significant increase of Se concentration in iron plaque on the root surface, root, shoot, husk and brown rice, and significant decrease of Mn concentration in shoot, husk and brown rice. At the Se concentrations of 0.5 and 1.0 mg·kg-1 in soil, Mn concentrations in rice shoot decreased by 32.2% and 35.0% respectively, in husk 22.0% and 42.6%, in brown rice 27.5% and 28.5%, compared with the Se-free treatment. There was no significant effect of Se on the P and Fe concentrations in every parts of rice, except for Fe concentrations in husk. The translocation of P and Fe from iron plaque, root, shoot and husk to brown rice was not significantly affected by Se addition, but Mn translocation from iron plaque and root to brown rice was significantly inhibited by Se addition. Addition of 1.0 mg·kg-1 Se resulted in the decrease of translocation factor from iron plaque and root to brown rice by 38.9% and 37.9%, respectively, compared with the control treatment. The distribution ratios of Mn, Fe, P and Se in iron plaque, root, shoot, husk and brown rice were also affected by Se addition. The results indicated that Mn uptake, accumulation and translocation in rice could be decreased by the addition of Se in soil, therefore, Se addition could reduce the Mn harm to human health through food chain. |
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