Manganese hyperaccumulation from non-contaminated soil inChengiopanax sciadophylloidesFranch. et Sav. and its correlation with calcium accumulation

Abstract

The objective of this study was to explore the ability of Chengiopanax sciadophylloides Franch. et Sav. to hyperaccumulate manganese (Mn). We were particularly interested in (1) Mn uptake ability relative to soil-Mn availability, (2) the potential use of this species in phytomining, and (3) potential key physiological factors associated with Mn hyperaccumulation ability. Among plants sampled from 17 locations in their native Japan provenance, the maximum foliar Mn concentration was 23,000 mg kg −1 dry weight (dw; mean: 11,000 mg kg). Soils from all sites examined contained low to normal Mn concentrations. There were no significant relationships detected between several soil factors and foliar Mn concentrations, although we found a strong positive correlation between foliar Mn and calcium (Ca) concentrations. Half of the foliar Mn was readily extractable with water, and almost all Mn was extractable with hydrochloric acid (HCl). Furthermore, a highly purified Mn compound was precipitated from leaf ash solutions when pH was adjusted to 8-10. We demonstrated that C. sciadophylloides has an extraordinary Mn-accumulating ability in non-contaminated soil and that Ca accumulation is correlated with Mn hyperaccumulation. We also showed that collecting Mn from C. sciadophylloides is easy and straightforward. We discuss the potential for using the plant in Mn phytomining.

Chronically Low Nutrient Concentrations in Tree Rings Are Linked to Greater Tree Vulnerability to Drought in Nothofagus dombeyi

“…Thirdly, greater exudation of organic acids and carboxylates by D tree's roots for improving mineralization and mobilization of inorganic and organic P may have also contributed to this pattern [101]. Organic acids and carboxylates exudation by roots also enhances the availability of other micronutrients such as Mn, thereby increasing its concentration in plant tissues [102] together with an accumulation of Ca [103]. This interpretation is further supported by the sharp recent increase of Ca and Mn concentrations and Ca:Mn ratio (Figure 5) and negative correlation between Ca concentration and δ 18 O observed in D trees (Figure 6).…”

Manganese distribution in the Mn-hyperaccumulator Grevillea meisneri from New Caledonia

“…This similarity could explain the positive Mn/Ca correlation via a cooperative uptake and transportation pathway in G. meisneri 115 . Indeed, many transporters of Ca(II), such as some membrane Ca 2+ channels, are reported to be permeable to Mn in Arabidopsis thaliana (Brassicaceae) and in Acanthopanax sciadophylloides (Araliaceae) 116 – 120 .…”

Mn accumulation in a submerged plant Egeria densa (Hydrocharitaceae) is mediated by epiphytic bacteria

“…(Araliaceae) reached 23 500 mg kg −1 dry weight, suggesting that these leaves may have use as Mn fertilized in organic farming (Mizuno et al . , ).…”