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arbuscular mycorrhiza of berkheya coddii and other ni-hyperaccumulating members of asteraceae from ultramafic soils in south africa.the occurrence of arbuscular mycorrhiza (am) in nickel-(ni)-hyperaccumulating plants of the asteraceae family growing on ni-enriched ultramafic soils in south africa was surveyed. all plants were found to be consistently colonised by am fungi, with the abundant formation of arbuscules. berkheya coddii, which is an important species for phytomining, formed well-developed mycorrhiza under greenhouse conditions. plants cultivated under greenhouse conditions and inoculated with native fungi had a hi ...200312938030
nickel and cobalt phytoextraction by the hyperaccumulator berkheya coddii: implications for polymetallic phytomining and phytoremediation.we investigated the potential of the south african high-biomass ni hyperaccumulator berkheya coddii to phytoextract co and/or ni from artificial metalliferous media. plant accumulation of both metals from single-element substrates indicate that the plant/media metal concentration quotient (bioaccumulation coefficient) increases as total metal concentrations increase. cobalt was readily taken up by b. coddii with and without the presence of ni. nickel uptake was, however, inhibited by the presenc ...200314750431
production of nickel bio-ore from hyperaccumulator plant biomass: applications in phytomining.an important step in phytomining operations is the recovery of metal from harvested plant material. in this work, a laboratory-scale horizontal tube furnace was used to generate ni-enriched bio-ore from the dried biomass of ni hyperaccumulator plants. prior to furnace treatment, hairy roots of alyssum bertolonii were exposed to ni in liquid medium to give biomass ni concentrations of 1.9% to 7.7% dry weight; whole plants of berkheya coddii were grown in ni-containing soil to produce above-ground ...200415083504
short-term effects of dimethoate on metabolic responses in chrysolina pardalina (chrysomelidae) feeding on berkheya coddii (asteraceae), a hyper-accumulator of nickel.berkheya coddii roessler (asteraceae) is a hyper-accumulator of nickel, which can be used in phytomining and phytoremediation. chrysolina pardalina fabricius (chrysomelidae) is a phytophagous leaf beetle, which may be useful in controlling population levels of b. coddii after it has been introduced into a new habitat. the aim of this study was to investigate the response of c. pardalina to topical application of dimethoate. data recorded included the activity of acetylcholinesterase (ache), the ...200717374424
root responses to soil ni heterogeneity in a hyperaccumulator and a non-accumulator species.we compared root responses of the ni-hyperaccumulator plant berkheya coddii rossler with the non-accumulator plant cicer arietinum l. to ni heterogeneity in soil. we grew plants in growth containers filled with control soil, homogeneously spiked, and heterogeneously spiked soil with ni concentrations of 62 and 125 mg kg(-1). neutron radiography (nr) was used to observe the root distribution and the obtained images were analysed to reveal the root volumes in the spiked and unspiked segments of th ...201319427726
differentiation of regenerative cells in the midgut epithelium of epilachna cf nylanderi (mulsant 1850) (insecta, coleoptera, coccinellidae).differentiation of regenerative cells in the midgut epithelium of epilachna cf nylanderi (mulsant 1850) (insecta, coleoptera, coccinellidae), a consumer of the ni-hyperaccumulator berkheya coddii (asteracae) from south africa, has been monitored and described. adult specimens in various developmental phases were studied with the use of light microscopy and transmission electron microscopy. all degenerated epithelial cells are replaced by newly differentiated cells. they originate from regenerati ...201020968188
the effect of mycorrhiza on the growth and elemental composition of ni-hyperaccumulating plant berkheya coddii roessler.the effect of arbuscular mycorrhizal fungi (amf) on growth and element uptake by ni-hyperaccumulating plant, berkheya coddii, was studied. plants were grown under laboratory conditions on ultramafic soil without or with the am fungi of different origin. the am colonization, especially with the indigenous strain, significantly enhanced plants growth and their survival. amf affected also the elemental concentrations that were studied with particle-induced x-ray emission (pixe). amf (i) increased k ...201121835516
mycorrhizal colonization affects the elemental distribution in roots of ni-hyperaccumulator berkheya coddii roessler.the effect of arbuscular mycorrhizal fungi (amf) on the distribution and concentration of elements in roots of ni-hyperaccumulating plant berkheya coddii was studied. micro-pixe (particle-induced x-ray emission) analysis revealed significant differences between amf-inoculated and non-inoculated plants as well as between main and lateral roots. the accumulation of p, k, mn and zn in the cortical layer of lateral roots of inoculated plants confirmed the important role of amf in uptake and accumula ...201323369753
elemental distribution in reproductive and neural organs of the epilachna nylanderi (coleoptera: coccinellidae), a phytophage of nickel hyperaccumulator berkheya coddii (asterales: asteraceae) by micro-pixe.the phenomenon of metal hyperaccumulation by plants is often explained by a pathogen or herbivore defense hypothesis. however, some insects feeding on metal hyperaccumulating plants are adapted to the high level of metals in plant tissues. former studies on species that feed on the leaves of berkheya coddii roessler 1958 (asteraceae), a nickel-hyperaccumulating plant, demonstrated several protective mechanisms involved in internal distribution, immobilization, and elimination of ni from the midg ...201425399425
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