Cadmium accumulation is enhanced by ammonium compared to nitrate in two hyperaccumulators, without affecting speciation.
Cadmium accumulation is enhanced by ammonium compared to nitrate in two hyperaccumulators, without affecting speciation.
复制标题
DOI：
10.1093/jxb/erw270
复制
发表时间：
2016-09
影响因子：
6.9
通讯作者：
Tang C
中科院分区：
文献类型：
--
作者：
Cheng M;Wang P;Kopittke PM;Wang A;Sale PW;Tang C
与NO3 −相比，NH 4+的供应增加了萝卜和龙葵对Cd的吸收、转运和积累。Cd-S是Cd的主要形态，Cd在木质部中以游离态迁移。施氮可提高Cd污染土壤的植物提取效率，缩短修复时间。然而，有限的信息是可用的N形态对镉的植物提取和相关机制的影响。研究了氮素形态对萝卜和龙葵镉积累、转运和形态转化的影响。植物生长在含有5-15 μM Cd和1000 μM NH 4+或NO3 −的营养液中。植物生长和镉吸收的测量，镉的形态进行了分析，使用同步辐射X射线吸收光谱。地上部Cd积累量在NH 4+条件下比NO3 −条件下高30%。罗氏食蟹猴对Cd的积累量是S的3倍。黑色素。然而，Cd形态在植物中不受N形态的影响，但它确实因物种和组织而异。In C. rossii中，除木质部汁液中87-95%为Cd-OH络合物外，其余组织中高达91%的Cd与含硫配体结合。此外，地上部中Cd-S的比例在S中显著降低。nigrum（44-69%）比C. rossii（60-91%）。因此，施用NH 4+（而不是NO3 −）是通过增加地上部Cd的吸收和转运而不是改变Cd的形态来增加地上部Cd的积累，是一种潜在的提高Cd植物提取率的有效途径。
Supply of NH4 + compared with NO3 − increased plant Cd uptake, translocation and accumulation in Carpobrotus rossii and Solanum nigrum. Cd-S was the dominant Cd species, with Cd being transported as free ions in xylem. Nitrogen fertilization could improve the efficiency of Cd phytoextraction in contaminated soil and thus shorten the remediation time. However, limited information is available on the effect of N form on Cd phytoextraction and associated mechanisms in plants. This study examined the effect of N form on Cd accumulation, translocation, and speciation in Carpobrotus rossii and Solanum nigrum. Plants were grown in nutrient solution with 5–15 μM Cd in the presence of 1000 µM NH4 + or NO3 −. Plant growth and Cd uptake were measured, and Cd speciation was analyzed using synchrotron-based X-ray absorption spectroscopy. Shoot Cd accumulation was 30% greater with NH4 + than NO3 − supply. Carpobrotus rossii accumulated three times more Cd than S. nigrum. However, Cd speciation in the plants was not influenced by N form, but it did vary with species and tissues. In C. rossii, up to 91% of Cd was bound to S-containing ligands in all tissues except the xylem sap where 87–95% were Cd-OH complexes. Furthermore, the proportion of Cd-S in shoots was substantially lower in S. nigrum (44–69%) than in C. rossii (60–91%). It is concluded that the application of NH4 + (instead of NO3 −) increased shoot Cd accumulation by increasing uptake and translocation, rather than changing Cd speciation, and is potentially an effective approach for increasing Cd phytoextraction.
登录
查看更多内容
影响因子：
6.4
作者：
Hazama, Kenji;Nagata, Shinji;Yoneyama, Tadakatsu
通讯作者：
Yoneyama, Tadakatsu
影响因子：
2.1
作者：
Maier, NA;McLaughlin, MJ;Smart, MK
通讯作者：
Smart, MK
影响因子：
6.9
作者：
Miller, AJ;Cookson, SJ;Wells, DM
通讯作者：
Wells, DM
影响因子：
7.4
作者：
Kopittke, Peter M.;Menzies, Neal W.;Lombi, Enzo
通讯作者：
Lombi, Enzo
影响因子：
7.4
作者：
Küpper, H;Zhao, FJ;McGrath, SP
通讯作者：
McGrath, SP