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Growth and Nickel Uptake by Serpentine and Non-Serpentine Populations of Fimbristylis ovata (Cyperaceae) from Sri Lanka
Australian Journal of Botany (2015)
  • Dileepa Chathuranga, Institute of Fundamental Studies
  • Thamara Dharmasena, Institute of Fundamental Studies
  • Nishanta Rajakaruna, College of the Atlantic
  • Mohomed Iqbal, Institute of Fundamental Studies
Abstract
Compared with serpentine floras of Southeast Asia, the serpentine vegetation of Sri Lanka is impoverished in regard to serpentine endemics and nickel hyperaccumulators. All species so far documented from the serpentine outcrops of Sri Lanka also have non-serpentine populations; it is unclear whether the serpentine populations are physiologically distinct and deserve ecotypic recognition. We conducted a preliminary study to examine whether serpentine and non-serpentine populations of Fimbristylis ovata represent locally adapted ecotypes by investigating their growth and potential for nickel uptake and tolerance under greenhouse conditions. Although both populations of F. ovata showed a similar growth pattern in serpentine soil during short-term exposure (21 days), the non-serpentine population was unable to survive in serpentine soil under long-term exposure (4 months). Both populations were able to uptake nickel from serpentine soil during short-term exposure (21 days). The serpentine population, however, translocated significantly more nickel from its roots to shoots (translocation factor 0.43) than the non-serpentine population (translocation factor 0.29). Our preliminary investigations suggest that the serpentine and non-serpentine populations ofF. ovata may be locally adapted to their respective soils. However, additional studies are required to determine whether the populations deserve ecotypic recognition.
Keywords
  • ecotypic differentiation,
  • edaphic tolerance,
  • geobotany,
  • ion uptake,
  • nickel tolerance,
  • population differentiation,
  • restoration ecology,
  • serpentine ecology
Disciplines
Publication Date
2015
DOI
10.1071/BT14232
Citation Information
Dileepa Chathuranga, Thamara Dharmasena, Nishanta Rajakaruna and Mohomed Iqbal. "Growth and Nickel Uptake by Serpentine and Non-Serpentine Populations of Fimbristylis ovata (Cyperaceae) from Sri Lanka" Australian Journal of Botany Vol. 63 Iss. 2 (2015) p. 128 - 133 ISSN: 0067-1924
Available at: http://works.bepress.com/nishanta_rajakaruna/37/