Variation in copper and zinc tolerance and accumulation in 12 willow clones: implications for phytoextraction

Abstract

Willows (Salix spp.) have shown high potential for the phytoextraction of heavy metals. This study compares variations in copper (Cu) and zinc (Zn) tolerance and accumulation potential among 12 willow clones grown in a nutrient solution treated with 50 μmol/L of Cu or Zn, respectively. The results showed differences in the tolerance and accumulation of Cu and Zn with respect to different species/clones. The biomass variation among clones in response to Cu or Zn exposure ranged from the stimulation of growth to inhibition, and all of the clones tested showed higher tolerance to Cu than to Zn. The clones exhibited less variation in Cu accumulation but larger variation in Zn accumulation. Based on translocation factors, it was found that most of the Cu was retained in the roots and that Zn was more mobile than Cu for all clones. It is concluded that most willow clones are good accumulators of Zn and Cu.

Diversity of low-molecular weight organic acids synthesized by Salix growing in soils characterized by different Cu, Pb and Zn concentrations

“…In spite of this, the efficiency of phytoextraction of all metals in Salix was particularly high in leaves. In many cases, the presented values were significantly higher than those recorded in other papers (Ahmed et al 2015) and the transport of metals inside plants was more effective in relation to Salix taxa other than the ones studied in this paper, when comparing, e.g., translocation factor values (Yang et al 2014).…”

Changes of photochemical efficiency and epidermal polyphenols content of Prosopis glandulosa and Prosopis juliflora leaves exposed to cadmium and copper

“…For example, no symptom of necrosis or chlorosis were observed in the leaves of P. glandulosa, suggesting that the dose of Cu +2 evaluated was not severely phytotoxic compared to P. juliflora. Similar results were observed in willow plants exposed to heavy metals, where the genetic variation was related with the tolerance capacity [18]. On the other hand, several studies show that the plants possess a sophisticated and interrelated and 72 to 96 h. Otherwise, the P. juliflora leaves exposed to cadmium did not show changes due to the exposure time and doses evaluated (Fig.…”

Phytoextraction of initial cutting of Salix matsudana for Cd and Cu

“…The interaction between Cd/Cu and other heavy metal elements has been investigated (Ernst et al 1992;Yang et al 2014). However, several reports on the interaction between Cd and Cu are complicated (Fig.…”

“…In contrast to common interactions between heavy metals, the interactions between Cd and Zn are mostly dependent on plant species (Bowen 1987, Lidon and Henriques 1993, Ernst et al 1992, McKenna et al 1993. Yang et al (2014) also reported that Cu and Zn are absorbed by willows via independent uptake mechanisms, which have been demonstrated in other plants by Ali et al (2004). The interaction between Cd and Cu has not been explicitly reported.…”