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Phenotyping 60 populations of Noccaea caerulescens provides a broader knowledge of variation in traits of interest for phytoextraction / Thibault STERCKEMAN Th. / 2017
Titre : Phenotyping 60 populations of Noccaea caerulescens provides a broader knowledge of variation in traits of interest for phytoextraction Type de document : texte imprimé Auteurs : Thibault STERCKEMAN Th., Auteur ; Yannick CAZES Y., Auteur ; GONNEAU C., Auteur ; Catherine SIRGUEY C., Auteur Année de publication : 2017 Importance : 523-540 Langues : Français (fre) Catégories : MASSIF CENTRAL
Mots-clés : Hyperaccumulation, Cadmium, Nickel, Zinc, Magnesium Résumé : Background and aims Noccaea caerulescens is a model plant for understanding metal hyperaccumulation as well as being a potential source of cultivars for phytoextraction. Sixty populations from nonmetallicolous (NM), calamine (CAL) and serpentine (SER) edaphic groupswere phenotyped in order to more extensively characterise the species and to detect candidates for cultivar selection.
Methods 15 plants per population were grown until fruit maturity in a greenhouse on a homogeneous soil spiked with Cd, Ni and Zn. Development, growth and ionome variables were measured.
Results NM and SER edaphic groups seem to be similar, with plants producing fewer inflorescences and shoot biomass, flowering later, reaching maturity sooner and accumulating more transition metals than CAL plants. Three geographically structured CAL subgroups could be distinguished according to their shoot Cd/Zn ratio. Only CAL populations from the south east of the Massif Central were observed to hyperaccumulate Cd. At the species level, the Ni and Zn contents were strongly correlated. Nickel accumulation was also closely associated to that of Mg and Ca. The NM and SER edaphic groups both hyperaccumulated Ni and Zn.
Biomass production was not correlated to metal contents, suggesting no trade-off between these traits. Conclusions The high natural variability of N. caerulescens’ traits and its accumulation potential could be ex.
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