Differential elemental uptake in three pseudo-metallophyte C-4 grasses in situ in the eastern USA

TitleDifferential elemental uptake in three pseudo-metallophyte C-4 grasses in situ in the eastern USA
Publication TypeJournal Article
Year of Publication2017
AuthorsGonneau C., Mohanty S.K, Dietterich L.H, Hwang W.T, Willenbring J.K, Casper B.B
JournalPlant and Soil
Volume416
Pagination149-163
Date Published2017/07
Type of ArticleArticle
ISBN Number0032-079X
Accession NumberWOS:000405916400012
Keywordsaccumulation; agriculture; arabidopsis-halleri; C-4 grass; cadmium-contaminated soil; Calamine; excluder; heavy-metals; last glacial maximum; metallicolous; noccaea-caerulescens; north-america; Plant Sciences; populations; Pseudo-metallophytes; Serpentine; serpentine soils; thlaspi-caerulescens; trace-elements
Abstract

Elemental uptake in serpentine floras in eastern North America is largely unknown. The objective of this study was to determine major and trace element concentrations in soil and leaves of three native pseudo-metallophyte C-4 grasses in situ at five sites with three very different soil types, including three serpentine sites, in eastern USA. Pseudo-total and extractible concentrations of 15 elements were measured and correlated from the soils and leaves of three species at the five sites. Element concentrations in soils of pseudo-metallophytes varied up to five orders of magnitude. Soils from metalliferous sites exhibited higher concentrations of their characteristic elements than non-metalliferous. In metallicolous populations, elemental concentrations depended on the element. Concentrations of major elements (Ca, Mg, K) in leaves were lower than typical toxicity thresholds, whereas concentrations of Zn were higher. In grasses, species can maintain relatively low metal concentrations in their leaves even when soil concentrations are richer. However, in highly Zn-contaminated soil, we found evidence of a threshold concentration above which Zn uptake increases drastically. Finally, absence of main characteristics of serpentine soil at one site indicated the importance of soil survey and restoration to maintain serpentinophytes communities and avoid soil encroachment.

DOI10.1007/s11104-017-3198-9
Short TitlePlant Soil
Student Publication: 
No
Research Topics: 
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