Xylem-based long-distance transport and phloem remobilization of copper in Salix integra Thunb.
J Hazard Mater
; 392: 122428, 2020 06 15.
Article
de En
| MEDLINE
| ID: mdl-32208308
ABSTRACT
Due to high biomass and an ability to accumulate metals, fast-growing tree species are good candidates for phytoremediation. However, little is known about the long-distance transport of heavy metals in woody plants. The present work focused on the xylem transport and phloem remobilization of copper (Cu) in Salix integra Thunb. Seedlings with 45 d preculture were grown in nutrient solutions added with 0.32 and 10 µM CuSO4 for 5 d. Micro X-ray fluorescence imaging showed the high Cu intensity in xylem tissues of both stem and root cross sections, confirming that the xylem played a vital role in Cu transport from roots to shoots. Cu was presented in both xylem sap and phloem exudate, which demonstrates the long-distance transport of Cu via both vascular tissues. Additionally, the 65Cu spiked mature leaf exported approximately 78 % 65Cu to newly emerged shoots, and approximately 22 % downward to the new roots, confirming the bidirectional transport of Cu via phloem. To our knowledge, this is the first report to characterize Cu vascular transport and remobilization in fast-growing woody plants, and the findings provide valuable mechanistic understanding for the phytoremediation of Cu-contaminated soils.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Polluants du sol
/
Cuivre
/
Salix
/
Phloème
/
Xylème
Langue:
En
Journal:
J Hazard Mater
Sujet du journal:
SAUDE AMBIENTAL
Année:
2020
Type de document:
Article
Pays d'affiliation:
Chine