Hyperaccumulator Alyssum murale relies on a different metal storage mechanism for cobalt than for nickel

被引：148

作者：

Tappero, R. ^{[1
]}

Peltier, E.

Graefe, M.

Heidel, K.

Ginder-Vogel, M.

Livi, K. J. T.

Rivers, M. L.

Marcus, M. A.

Chaney, R. L.

Sparks, D. L.

机构：

[1] Univ Delaware, Newark, DE 19716 USA

[2] Stanford Univ, Stanford, CA 94305 USA

[3] Johns Hopkins Univ, Baltimore, MD 21218 USA

[4] Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60637 USA

[5] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[6] USDA ARS, Beltsville, MD 20705 USA

来源：

NEW PHYTOLOGIST | 2007年 / 175卷 / 04期

关键词：

Alyssum murale; cobalt (Co); computed-microtomography (CMT); hyperaccumulation; nickel (Ni); synchrotron X-ray microfluorescence (SXRF); tolerance;

D O I：

10.1111/j.1469-8137.2007.02134.x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The nickel (Ni) hyperaccumulator Alyssum murale has been developed as a commercial crop for phytoremediation/phytomining Ni from metal-enriched soils. Here, metal co-tolerance, accumulation and localization were investigated for A. murale exposed to metal co-contaminants. A. murale was irrigated with Ni-enriched nutrient solutions containing basal or elevated concentrations of cobalt (Co) or zinc (Zn). Metal localization and elemental associations were investigated in situ with synchrotron X-ray microfluorescence (SXRF) and computed-microtomography (CMT). A. murale hyperaccumulated Ni and Co(> 1000 mu g g(-1) dry weight) from mixed-metal systems. Zinc was not hyperaccumulated. Elevated Co or Zn concentrations did not alter Ni accumulation or localization. SXRF images showed uniform Ni distribution in leaves and preferential localization of Co near leaf tips/margins. CMT images revealed that leaf epidermal tissue was enriched with Ni but devoid of Co, that Co was localized in the apoplasm of leaf ground tissue and that Co was sequestered on leaf surfaces near the tips/margins. Cobalt-rich mineral precipitate(s) form on leaves of Co-treated A. murale. Specialized biochemical processes linked with Ni (hyper)tolerance in A. murale do not confer (hyper)tolerance to Co. A. murale relies on a different metal storage mechanism for Co (exocellular sequestration) than for Ni (vacuolar sequestration).

引用

页码：641 / 654

页数：14

共 67 条

[1]

Adriano D.C., 1986, TRACE ELEMENTS TERRE, P1, DOI [DOI 10.1007/978-1-4757-1907-9, 10.1007/978-1-4757-1907-9]

[2]

[Anonymous], 1995, MINERAL NUTR HIGHER

[3] Copper localization in Cannabis sativa L. grown in a copper-rich solution [J].