Publications des scientifiques de l'IRD

Isnard Sandrine, L'Huillier L., Paul A.L.D., Munzinger Jérôme, Fogliani B., Echevarria G., Erskine P.D., Gei V., Jaffré Tanguy, van der Ent A. (2020). Novel insights into the hyperaccumulation syndrome in Pycnandra (Sapotaceae). Frontiers in Plant Science, p. art. 559059 [14 p.]. ISSN 1664-462X.

Titre du document
Novel insights into the hyperaccumulation syndrome in Pycnandra (Sapotaceae)
Année de publication
2020
Type de document
Article référencé dans le Web of Science WOS:000574407300001
Auteurs
Isnard Sandrine, L'Huillier L., Paul A.L.D., Munzinger Jérôme, Fogliani B., Echevarria G., Erskine P.D., Gei V., Jaffré Tanguy, van der Ent A.
Source
Frontiers in Plant Science, 2020, p. art. 559059 [14 p.] ISSN 1664-462X
The discovery of nickel hyperaccumulation, in Pycnandra acuminata, was the start of a global quest in this fascinating phenomenon. Despite recent advances in the physiology and molecular genetics of hyperaccumulation, the mechanisms and tolerance of Ni accumulation in the most extreme example reported to date, P. acuminata, remains enigmatic. We conducted a hydroponic experiment to establish Ni tolerance levels and translocation patterns in roots and shoots of P. acuminata, and analyzed elemental partitioning to gain insights into Ni regulation. We combined a phylogeny and foliar Ni concentrations to assess the incidence of hyperaccumulation within the genus Pycnandra. Hydroponic dosing experiments revealed that P. acuminata can resist extreme Ni concentrations in solution (up to 3,000 µM), and dosing at 100 µM Ni was beneficial to growth. All plant parts were highly enriched in Ni, but the latex had extreme Ni concentrations (124,000 µg g−1). Hyperaccumulation evolved independently in only two subgenera and five species of the genus Pycnandra. The extremely high level of Ni tolerance is posited to derive from the unique properties of laticifers. The evolutionary and ecological significance of Ni hyperaccumulation in Pycnandra is discussed in light of these findings. We suggest that Ni-rich laticifers might be more widespread in the plant kingdom and that more investigation is warranted.
Plan de classement
Mécanismes physiologique et biochimiques des plantes [076PHYBIO]
Descripteurs
NICKEL ; TOLERANCE ; PLANTE A LATEX ; EXPERIMENTATION ; HYPERACCUMULATION ; HYDROPONIE ; SPECTROSCOPIE DE FLUORESCENCE DES RAYONS X
Description Géographique
NOUVELLE CALEDONIE
Localisation
Fonds IRD ; Nouméa
Identifiant IRD
fdi:010078681
Contact