Comparative study of Cd tolerance and accumulation potential between Cakile maritima L (halophyte) and Brassicajuncea L.

摘要

In this work we evaluated Cd-phytoextraction ability of the halophyte Cakile maritima comparatively to the glycophyte Brassica juncea commonly recommended for phytoextraction. Seedlings were grown in nutrient solution added with 0-100 μM Cd for 21 days. Cd impaired growth in B. juncea but had no significant impact on C maritima. The halophyte C. maritima maintained also higher photosynthetic activity than the glycophyte B. juncea. Cd decreased leaf chlorophyll (Chl) and carotenoids concentrations as well as PSII efficiency (F_v/F_m, F_V/F_0 and Φ_(PSII)) in B. juncea while it increased intercellular CO2 concentration in this species. Shoot Cd content was higher in the halophyte C. maritima reaching 1365 μg g~(-1) dw at 100 μM while it was 548 μg g~(-1) dw in B. juncea at the same dose. The translocation factor (TF) was higher for C maritima than for B. juncea at all external Cd doses. It is concluded that the halophyte C. maritima could be considered as a promising plant material for Cd-phytoextraction.