Manganese tolerance and accumulation in six Mn hyperaccumulators or accumulators

Abstract

This study used hydroponics cultivation to investigate the manganese (Mn) accumulation and tolerance abilities of six species-Phytolacca americana L., Poa annua L., Comnyza canadensis L., Cynodon dactylon L., Polygonum hydropiper L., and Polygonum perfoliatum L. We found that P. perfoliatum, P. hydropiper, and P. americana were Mnhyperaccumulators and that P. perforliatum have superior Mn accumulation and toleration abilities over the other five species. The Mn concentration within the shoots of P. perfoliatum reached as high as 18,342.3 mg kg −1 . The root growth of P. perfoliatum was promoted under low-Mn treatments, but the growths of the five other species were inhibited by the Mn treatments and the damage intensified as Mn concentration increased. The biomass of P. perfoliatum was minimally affected by the Mn treatments.The chlorophyll (CHL), soluble protein (SP), and malondialdehyde (MDA) contents of P. perfoliatum were not adversely affected, but these parameters of the other five species showed significant (P<0.05) deterioration from the control. By comparison among the six species, the hyperaccumulator P. perfoliatum was the most suitable species for bioremediation of Mn-polluted environments. However, the findings need further study in soil cultivation.

Leaf manganese accumulation and phosphorus-acquisition efficiency

“…Polygonum perfoliatum and Polygonum hydropiper (Polygonaceae) are also Mn-hyperaccumulating herbaceous species, with shoot concentrations up to 18 340 mg Mn g À1 DW [42]. Polygonaceae species lack cluster roots and are considered nonmycorrhizal [44]; however, Polygonum viviparum has been found to be ectomycorrhizal [48].…”

Heavy metal accumulation in invasive Reynoutria × bohemica Chrtek & Chrtková in polluted areas

“…Manganese concentrations in soil samples were higher than the world soil average (270-550 mg kg -1 , with the maximum in calcareous and loamy soils, according to Kabata-Pendias (2011)). This and the fact that Mn levels in soil have increased in recent decades due to pollution from acidic fertilizers, acid rain and industrial waste (Liu et al 2010) could explain the high concentration in soil from the Bavanište and Topčider localities. The concentration of nickel depends to a great extent on its content in the parent material, and elevated levels have been recorded mainly on ultramafic substrates and soils above them.…”

Influence of Soil Chemistry and Plant Physiology in the Phytoremediation of Cu, Mn, and Zn

“…In another study, the same Mn tolerance and accumulation mechanism was tested in six species. Of those, the authors found that P. perfoliatum, P. hydropiper, and P. americana were Mn hyperaccumulators and that P. perforliatum had superior Mn accumulation and tolerance (shoots of P. perfoliatum reached 18342 μg g −1 ) over the other five species (Liu et al, 2010b). Five woody plants species (T. arjuna, P. juliflora, P. alba, E. tereticornis and D. strictus) were evaluated for their capacity to remediate metals from tannery sludge dumps.…”