Simultaneous Hyperaccumulation of Nickel, Manganese, and Calcium in Alyssum Leaf Trichomes
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- 作者：C. Leigh Broadhurst ; Rufus L. Chaney ; J. Scott Angle ; Timothy K. Maugel ; Eric F. Erbe ; and Charles A. Murphy
- 刊名：Environmental Science & Technology
- 出版年：2004
- 出版时间：November 1, 2004
- 年：2004
- 卷：38
- 期：21
- 页码：5797 - 5802
- 全文大小：984K
- 年卷期：v.38,no.21(November 1, 2004)
- ISSN：1520-5851
文摘
We have developed commercially viable phytoremediation/phytomining technologies employing Alyssum Ni-hyperaccumulator species to quantitatively extract Ni fromsoils. The majority of Ni is stored either in Alyssum leafepidermal cell vacuoles or in the basal portions only of thenumerous stellate trichomes. Here, we report simultaneousand region-specific localization of high levels of Ni,Mn, and Ca within Alyssum trichomes as determined byscanning electron microscopy/energy-dispersive X-rayanalysis (SEM/EDX). Plants were grown in high Ni soil,achieving up to 48 400 
g g-1 Ni in total leaf concentration;however, Ca and Mn were not enriched in the experimentalsoils. The region-specific localization of hyperaccumulatedCa, Mn, and Ni occurred in three soil types, five Alyssumspecies/ecotypes, and over a wide range of soil Niconcentrations. The metal concentration in the trichomebasal compartment was ~15-20% dry weight, the highestever reported for healthy vascular plant tissue.
g g-1 Ni in total leaf concentration;however, Ca and Mn were not enriched in the experimentalsoils. The region-specific localization of hyperaccumulatedCa, Mn, and Ni occurred in three soil types, five Alyssumspecies/ecotypes, and over a wide range of soil Niconcentrations. The metal concentration in the trichomebasal compartment was ~15-20% dry weight, the highestever reported for healthy vascular plant tissue.