Potential hyperaccumulator plants for sustainable environment in tropical habitats

Abstract

Hyperaccumulators are rare ability of plants to accumulate excessive concentration of elements on roots and shoot tissues without any evidence of physiological stress. However, less research has been conducted in different environmental habitats. Hence, this study was conducted in Mount Magdiwata and Peatland Forest of La Paz, Philippines. The objectives of this research were to identify hyperaccumulator plants as well as analyze soil and plant elemental accumulations. Sampling stations were designated in stratified habitats. Collected soil and plant specimens were analyzed in the laboratory and data were interpreted using SPSS software. Cratoxylum sumatranum (Jack ) Blume, Syngramma alismifolia ( C. Presl ) J.Sm., Mitragyna speciosa Korth, Pneumatopteris laevis ( Mett ) Holtta and Pneumatopteris glabra ( Cope ) Holtt were species that shown hyperaccumulation criterion and had significant accumulation capacity in respective habitats. Manganese had accumulation capacity in the leaves of Mitragyna speciosa Korth above the thresholds level for heavy metal concentrations at 22393 mg/kg−1. Soil element Mg has higher accumulation in the leaves at 5257 mg/kg−1and Fe at 4298 mg/kg−1 both major soil elements had shown significant results. The accumulation capability of this identified species were prospective sources of hyperaccumulator plants onwards to phytoremediation technology to cleanse environmental toxicity.

Mechanisms of As, Cd, Pb, and Zn hyperaccumulation by plants and their effects on soil microbiome in the rhizosphere

“…and Noccaea sp. ), Pteridaceae (e.g., Pteris vittate L.), Lamiaceae (Lamium maculatum L.), Poaceae (Deschampsia caespitosa L.), and Crassulaceae, are often characterized by high accumulation of PTEs aboveground biomass (Małecka et al, 2019;Castaňares and Lojka, 2020). For example, out of 970 mg kg −1 total Zn content in soils, the leaf, stem, and root of Cratoxylum sumatranum (Jack) accumulated 223, 329, and 210 mg kg −1 of Zn, respectively, in the mountain of Magdiwata, Philippines (Castaňares and Lojka, 2020).…”

Influence and distribution of lead nitrate on growth and secondary metabolite accumulation in Withania somnifera (L.) Dunal in vitro shoots

“…Generally, Pb causes a significant reduction in seed germination rate, thickens cell walls, growth inhibition and chlorosis in plants (Yolcu et al, 2021;Collin et al, 2022) Certain plants have hyper accumulation capability to withstand and grow in metal rich soils viz. mining area or at industrial area (Castaňares & Lojka, 2020). These hyper accumulators have evolved a few specialized capabilities to withstand heavy metal stress and toxicity such as bioaccumulation of metals in their greener regions, sequestering metals to vacuoles/vesicles of the cells, binding to phytochelatins or metallo enzymes and activation of numerous antioxidants (Hakeem, 2015;Collin et al, 2022).…”