Root foraging and avoidance in hyperaccumulator and excluder plants: a rhizotron experiment

Autor: Antony van der Ent, Mirko Salinitro, Markus Puschenreiter, Alice Tognacchini
Přispěvatelé: Department of Forest and Soil Sciences, Universität für Bodenkultur Wien [Vienne, Autriche] (BOKU), Department of Biological, Geological, and Environmental Sciences [Bologna], Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Laboratoire Sols et Environnement (LSE), Université de Lorraine (UL)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre for Mined Land Rehabilitation, University of Southern Queensland (USQ), Tognacchini A., Salinitro M., Puschenreiter M., van der Ent A.
Rok vydání: 2020
Předmět:
Zdroj: Plant and Soil
Plant and Soil, Springer Verlag, 2020, 450 (1-2), pp.287-302. ⟨10.1007/s11104-020-04488-2⟩
Plant and Soil 450 (2020) 1-2
Plant and Soil, 450(1-2), 287-302
ISSN: 1573-5036
0032-079X
DOI: 10.1007/s11104-020-04488-2
Popis: AimsMetal hyperaccumulation is a rare phenomenon described for an increasing number of plant taxa. In this study we investigated the root growth responses of the well-known nickel, zinc, cadmium hyperaccumulatorNoccaea caerulescensand of the metal tolerant (non-accumulator)Stellaria media, in order to observe root foraging vs avoidance responses to nickel. MethodsTo allow for observations of root growth and foraging preferences, two accessions ofNoccaea caerulescensand two accessions ofStellaria mediaorginating from high nickel and low nickel habitats were grown in rhizotrons with localized nickel enrichment.ResultsThe root density in the control and nickel-enriched soil areas in the rhizotrons with differentN. caerulescensaccessions had distinct responses: moderate nickel avoidance was recorded for the non-nickel accession, while a clear foraging response was observed inN. caerulescensfrom the nickel accession. In contrast, nickel rooting avoidance was observed for bothS. mediaaccessions and was more pronounced in the non-nickel accession.ConclusionsThis study shows thatN. caerulescensoriginating from different accessions responded differently to soil nickel enrichment, with the nickel accession ofN. caerulescensactively foraging for nickel, suggesting a physiological adaptation and demand for this metal. In contrast, a clear nickel avoidance response by a metal tolerant species, S. media, was observed in this study, a phenomenon which has not been previously described; this suggests that root avoidance responses might play a role in the adaptation of metal tolerant species to Ni-rich soils.
Databáze: OpenAIRE
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