Plant and Soil

, Volume 328, Issue 1–2, pp 235–244

Copper tolerance in the cuprophyte Haumaniastrum katangense (S. Moore) P.A. Duvign. & Plancke

  • François K. Chipeng
  • Christian Hermans
  • Giles Colinet
  • Michel-Pierre Faucon
  • Michel Ngongo
  • Pierre Meerts
  • Nathalie Verbruggen
Regular Article

Abstract

Cu tolerance and accumulation have been studied in Haumaniastrum katangense, a cuprophyte from Katanga (DR Congo), previously described as a copper hyperaccumulator. Nicotiana plumbaginifolia, a well-known non-tolerant and non-accumulator species, was used as a control. The germination rate of H. katangense was enhanced by copper and fungicide addition, suggesting that fungal pathogens, which restrain germination in normal conditions, are limiting. In hydroponic culture in the Hoagland medium, H. katangense did not grow well, in contrast to N. plumbaginifolia. Better growth was achieved by adding fungicide or higher copper concentrations. The maximal non-effective concentration (NEC) was 12 µM CuSO4 for H. katangense grown in hydroponics, i.e. 24 times greater than Cu concentration in the Hoagland medium. By comparison, copper concentrations greater than 0.5 µM had a negative effect on the growth of N. plumbaginifolia. EC50 (50% effective concentration) in hydroponics was 40 µM CuSO4 for H. katangense and 6 µM CuSO4 for N. plumbaginifolia. EC100 (100% effective concentration) was 100 µM CuSO4 for H. katangense and 15 µM CuSO4 for N. plumbaginifolia. In soil, growth was also stimulated by Cu addition up to 300 mg kg-1 CuSO4. Surplus copper was also required for cultivating H. katangense in sterile conditions, suggesting that Cu excess may be necessary for needs other than pathogen defence. Cu accumulation in the shoot has been measured for N. plumbaginifolia and H. katangense at their respective NEC. Cu allocation in the two species showed a similar response to increasing Cu concentrations, i.e. root/shoot concentration ratio well above 1. In conclusion, H. katangense is highly tolerant to copper and has elevated copper requirement even in the absence of biotic interactions. Its accumulation pattern is typical of an excluder species.

Keywords

Tolerance Excluders Copper Haumaniastrum katangense Heavy metal Nicotiana plumbaginifolia 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • François K. Chipeng
    • 1
    • 4
  • Christian Hermans
    • 1
  • Giles Colinet
    • 2
  • Michel-Pierre Faucon
    • 3
  • Michel Ngongo
    • 4
  • Pierre Meerts
    • 3
  • Nathalie Verbruggen
    • 1
  1. 1.Laboratoire de Physiologie et de Génétique Moléculaire des PlantesUniversité Libre de BruxellesBrusselsBelgium
  2. 2.Laboratoire de Géopédologie, Unité Sol-Ecologie-TerritoireFaculté universitaire des Sciences Agronomiques de GemblouxGemblouxBelgium
  3. 3.Laboratoire d’Ecologie Végétale et BiogéochimieUniversité Libre de BruxellesBrusselsBelgium
  4. 4.Faculté des Sciences AgronomiquesUniversité de LubumbashiLubumbashiCongo

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