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A new nickel hyper-accumulator in the Asteraceae on serpentinite in the Barberton Greenstone Belt , South Africa
| Content Provider | Semantic Scholar |
|---|---|
| Author | Rajakaruna, Nishanta Schutte, Nadine Carol Komape, Dennis Mmakgabo Pieter Bester |
| Copyright Year | 2017 |
| Abstract | Collections of the Asteraceae were made from serpentinites in the Barberton Greenstone Belt (BGB) of South Africa to test for hyper-accumulation of nickel by members of this taxonomic group. The survey was prompted as very few nickel hyper-accumulators are known from South Africa, despite the large diversity of Asteraceae associated with the BGB. A previous study of the Asteraceae occurring on serpentinites of the BGB revealed five of the 56 taxa tested to be hyper-accumulators of nickel. Considering the phytoremediation applications of the known South African hyper-accumulators, such as Berkheya coddii, further exploration is required to search for more species with this ability. This study targeted the most frequently occurring Asteraceae taxa on eight randomly selected serpentinite outcrops in the BarbertonKaapsehoop region, namely four outcrops in grassland at an altitude above 1200 m and four in savanna below 800 m. Twenty species were sampled, including 12 that were tested for nickel hyper-accumulation for the first time. Although the majority of the species were excluders, a few species did accumulate nickel in the leaves as would be expected for known hyper-accumulators such as Berkheya nivea and B. zeyheri subsp. rehmannii var. rogersiana (Arctoteae). A new hyper-accumulator of nickel was identified. Senecio conrathii accumulated nickel in its leaves at 1017±382 μg/g (n = 5) on soil with a nickel content of 1917 mg/kg. This is the third species in the Senecioneae of South Africa to hyper-accumulate nickel after Senecio anomalochrous and S. coronatus. Seven tribes in the Asteraceae were screened and once again the only nickel hyper accumulators were recorded from the Arctoteae and Senecioneae. This suggests that further exploration for hyper-accumulators should focus on these tribes as they contain the six species (of 68 Asteraceae taxa from the BGB tested) to hyper-accumulate nickel. A New Nickel Hyperaccumulator in the Asteraceae on Serpentinite of the Barberton Greenstone Belt, South Africa |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://opus.sanbi.org/bitstream/20.500.12143/5435/1/Abstract%20Nickel%20Hyperaccumulator%20(2).pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
