Publications des scientifiques de l'IRD

Van der Ent A., Pillon Yohan, Fogliani B., Gei V., Jaffre T., Erskine P. D., Echevarria G., Spiers K. M., Paul A. L. D., Isnard Sandrine. (2022). Contrasting nickel and manganese accumulation and localization in New Caledonian Cunoniaceae. Plant and Soil, [Early access], [20 p.]. ISSN 0032-079X.

Titre du document
Contrasting nickel and manganese accumulation and localization in New Caledonian Cunoniaceae
Année de publication
2022
Type de document
Article référencé dans le Web of Science WOS:000777875400001
Auteurs
Van der Ent A., Pillon Yohan, Fogliani B., Gei V., Jaffre T., Erskine P. D., Echevarria G., Spiers K. M., Paul A. L. D., Isnard Sandrine
Source
Plant and Soil, 2022, [Early access], [20 p.] ISSN 0032-079X
Purpose The Cunoniaceae are a major component of the New Caledonian flora with 91 endemic species that are highly unusual in that multiple metals are hyperaccumulated in different species. This makes it an ideal model system for studying the nature of the hyperaccumulation phenomenon. Methods X-ray fluorescence spectroscopy (XRF) scanning of all herbarium collections of the Cunoniaceae was undertaken at the Herbarium of New Caledonia to reveal incidences of nickel (Ni) and manganese (Mn) accumulation. Following on, the Mn hyperaccumulating P. reticulata and the Ni hyperaccumulating P. xaragurensis were selected for detailed follow-up investigations using synchrotron-based X-ray fluorescence microscopy (XFM). Results The systematic XRF screening of herbarium specimens showed that numerous species have high foliar Mn and Ni with species either accumulating Ni or Mn, but not both elements simultaneously. Soil 'extractable' Mn and Ni concentrations associated with Pancheria reticulata and P. xaragurensis greatly varies between the species. The XFM data shows that P. reticulata has a distinctive distribution pattern with Mn concentrated in large hypodermal cells. This contrasts with P. xaragurensis where Ni was mainly localized in and around the epidermis, and hypodermal cells were not observed. Conclusions Manganese and Ni accumulation are differently localized in Pancheria species growing on ultramafic soils, which is not explained by contrasting soils conditions, but represents different ecophysiological adaptations.
Plan de classement
Pédologie [068] ; Sciences du monde végétal [076]
Description Géographique
NOUVELLE CALEDONIE
Localisation
Fonds IRD [F B010084613]
Identifiant IRD
fdi:010084613
Contact