Zinc tolerance modulation in Myracrodruon urundeuva plants

Growth, tolerance and zinc accumulation in Senna multijuga and Erythrina crista-galli seedlings

“…Gomes et al (2011) obtained increase of Zn contents in the shoots and roots with the increase in the amount of the metal in the soil with Salix humboldtiana. A similar result was found for Zn contents in the leaves of Myracrodruon urundeuva (Gomes et al, 2013). Hence, the results indicate that the species differ regarding the absorption and accumulation of Zn.…”

“…In addition, young plants are more sensitive, compared to adult plants, to the adverse conditions imposed by metals (Souza et al, 2012). However, tree species have different responses to soil contamination (Souza et al, 2012;Gomes et al, 2013), reinforcing the need for studies with tree species in soils contaminated by Zn.…”

Trace Elements Tolerance Modulated by Antioxidant System in Plants

“…In regard to GR, when M. urundeuva and P. glomerata were exposed to Zn and Cd, respectively, GR demonstrated a trend similar to APX (Gomes et al, 2013c;Marques and Soares, 2011). These results would be expected as GR and APX are linked through the glutathione-ascorbate (AsA-GSH) cycle.…”

“…Studies of these responses in the leaves of tolerant Brazilian species have, however, revealed that SOD did not show any type of As-, Zn-, or Cd-inducing inhibition in the As-tolerant Anadenanthera peregrina (Gomes et al, 2013b), the Zn-tolerant Myracrodruon urundeuva (Gomes et al, 2013c), or the Cd-tolerant (and hyperaccumulator) Pfaffia glomerata (Gomes et al, 2013e) respectively; and SOD activity was always higher in treated seedlings. Increases in SOD activity have been linked to higher values of superoxide radical concentrations due to the synthesis of enzymes induced by superoxide-mediated signal transduction (Rossato et al, 2011).…”

“…APX activity in seedlings exposed to trace elements has also drawn considerable attention. A. peregrina and M. urundeuva seedlings exposed to As or Zn doses (respectively) causing growth reductions (indicative of phytotoxicity) demonstrated decreased APX activity and increased H 2 O 2 contents and lipid peroxidation levels (Gomes et al, 2013b(Gomes et al, , 2013c; APX activity was not affected (or was higher than that seen in control plants) when exposed to nonphytotoxic doses of trace elements. Interestingly, the addition of phosphorus to the growth substrate increased As-tolerance in A. peregrina by increasing APX activity, which decreased H 2 O 2 accumulation and helped prevent lipid peroxidation in its leaves (Gomes et al, 2013b).…”