Cadmium accumulation and tolerance in Populus nigra and Salix alba

Abstract

Rooted cuttings of Populus nigra L. clone Poli and Salix alba L. clone SS5 were treated for three weeks with 50 μM CdSO 4 in nutrient solution. The willow showed a far higher Cd tolerance, expressed as tolerance index (Ti), than the poplar in both roots and leaves. The root Cd content was higher in poplar than in willow, whereas in leaves the opposite was found. As a consequence, the translocation factor (Tf) revealed a greater ability of Cd transport in willow than in poplar. Cd treatment enhanced cysteine, γ-glutamylcysteine and reduced glutathione contents in roots of both species, whereas in leaves they were only enhanced in poplar. Furthermore, only poplar leaves showed an enhanced content of phytochelatins, whereas malic and citric acids rose in response to Cd only in the willow leaves. Cd treatment increased putrescine, spermidine and spermine contents in both roots and leaves of the willow, whereas in poplar only the putrescine content was enhanced in roots.

Assessment of ibuprofen tolerance and removal capability in Populus nigra L. by in vitro culture

“…In this regard, a protective role of PAs against xenobiotics in pea plants was reported by [64]. Besides, in cuttings of P. nigra clone Poli, the same genotype used in the present work, an increase of PUT in plants exposed to an environmental pollutant like cadmium was reported by Zacchini et al [45].…”

“…For this purpose, we utilised callus cultures of P. nigra L. (clone Poli), a pioneer tree species for the riparian forest [43], whose notable capability to tolerate and remove an environmental pollutant like cadmium from different substrates was previously assessed in hydroponics and in in vitro experiments [31,44,45].…”

Polyamines may influence phytochelatin synthesis during Cd stress in rice

“…In SPDS-overexpressing transgenic European pear the GSH content was significantly depleted under heavy metal stress conditions compared to the wild type [37]. Interestingly, a comparative study on Cd treatment in poplar and willow plants revealed that Cd enhanced the phytochelatin content of poplar, especially in the leaves, but not in willow, whereas Cd increased PA contents in both the roots and leaves of willow but only that of putrescine in the roots of poplar [42]. SPM treatment was also found to provide protection against cadmium-induced oxidative damage in wheat, but failed to reverse the depletion of GSH content [8].…”

Morphophysiological Responses, Heavy Metal Accumulation and Phytoremoval Ability in Four Willow Clones Exposed to Cadmium Under Hydroponics

“…In this regard, Salicaceae plants have been intensively studied for their ability to accumulate and tolerate heavy metals (Dos Santos Utmazian et al 2007 ;Zacchini et al 2009Zacchini et al , 2011aDrzewiecka et al 2012 ;Fernàndez et al 2012 ). Salix spp.…”