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研究培育出几乎不吸收镉水稻
发布日期:2012/5/18 18:09:13 浏览次数:3029
日本研究人员在最新一期美国《植物细胞》杂志网络版上报告说,他们通过让水稻体内一个基因不发挥作用,培育出了几乎不吸收有毒的重金属镉的水稻。
日本冈山大学资源植物科学研究所的研究人员在研究水稻从土壤中吸收金属的机制的过程中,注意到一个名为“Nramp5”的基因。他们令存在于水稻根的外皮以及植株中心部位的“Nramp5”基因不发挥作用,然后把水稻种植到受镉污染的土壤中。收获的稻谷中镉的含量不到普通水稻的十分之一。
不过,如果“Nramp5”基因不发挥作用,水稻吸收生长必需的锰元素的能力也大幅下降,导致稻谷的收获量只有原先的约20%。研究人员下一步的研究计划是改变新品种水稻基因的组合,实现对水稻吸收金属元素的人工控制。
镉是一种毒性较强的重金属元素,长期居住在被镉污染地区的居民,食用当地生产的稻米和蔬菜,饮用被镉污染的水会对他们的健康造成危害。日本四大公害病之一的骨痛病(日本称“痛痛病”)就是由镉污染引起的。患者骨骼脆弱萎缩,易于骨折,关节疼痛,终日痛苦。(来源:新华网)
 

Nramp5 Is a Major Transporter Responsible for Manganese and Cadmium Uptake in Rice

renchunxiao 添加于 2012-5-18 10:14:11 72次阅读 | 0次推荐 | 0个评论

Paddy rice (Oryza sativa) is able to accumulate high concentrations of Mn without showing toxicity; however, the molecular mechanisms underlying Mn uptake are unknown. Here, we report that a member of the Nramp (for the Natural Resistance-Associated Macrophage Protein) family, Nramp5, is involved in Mn uptake and subsequently the accumulation of high concentrations of Mn in rice. Nramp5 was constitutively expressed in the roots and encodes a plasma membrane–localized protein. Nramp5 was polarly localized at the distal side of both exodermis and endodermis cells. Knockout of Nramp5 resulted in a significant reduction in growth and grain yield, especially when grown at low Mn concentrations. This growth reduction could be partially rescued by supplying high concentrations of Mn but not by the addition of Fe. Mineral analysis showed that the concentration of Mn and Cd in both the roots and shoots was lower in the knockout line than in wild-type rice. A short-term uptake experiment revealed that the knockout line lost the ability to take up Mn and Cd. Taken together, Nramp5 is a major transporter of Mn and Cd and is responsible for the transport of Mn and Cd from the external solution to root cells.

作 者:Akimasa Sasaki, Naoki Yamaji, Kengo Yokosho and Jian Feng Ma1
期刊名称: plant cell
期卷页: 第卷 第期 页
学科领域:生命科学 » 植物学 » 植物分类学
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原文链接:http://www.plantcell.org/content/early/2012/05/14/tpc.112.096925.abstract?sid=8cffbb82-2ec7-4333-86f2-146d3766a94c
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相关报道: http://paper.sciencenet.cn/htmlpaper/201251810151227524449.shtm
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