Cd-induced growth reduction in the halophyte Sesuvium portulacastrum is significantly improved by NaCl.
The effects of Cd(2+) and NaCl, applied together or separately, on growth and uptake of Cd(2+) were determined for the halophyte Sesuvium portulacastrum L. Seedlings were cultivated in the presence of 50 or 100 micromol L(-1) Cd(2+) alone or combined with 100 or 400 mmol L(-1) NaCl. Data showed that alone, Cd(2+) induced chlorosis, necrosis, and inhibited growth. Addition of NaCl to Cd(2+)-containing medium restored growth and alleviated the toxicity, however. NaCl also enhanced the amounts of Cd(2+) accumulated in the shoots. All Cd(2+) treatment reduced K(+) and Ca(2+) uptake and transport to the shoots. Accumulation of Na(+) in the shoots was not affected by Cd(2+), however. Thus S. portulacastrum maintained its halophytic characteristics in the presence of Cd(2+). We suggest this halophyte could be used for phytoextraction of Cd(2+) from salt-contaminated sites.
Ghnaya
Tahar
T
Laboratoire d'Adaptation des Plantes aux Stress Abiotiques, Centre de Biotechnologie, BP 901, Hammam-Lif, Tunisia.
Slama
Inès
I
Messedi
Dorsaf
D
Grignon
Claude
C
Ghorbel
Mohamed Habib
MH
Abdelly
Chedly
C
D035722:Aizoaceae / Q000187:drug effects* / Q000254:growth & development*; D002104:Cadmium / Q000494:pharmacology*; D002118:Calcium / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism; D018520:Plant Shoots / Q000187:drug effects / Q000378:metabolism; D011188:Potassium / Q000378:metabolism; D012964:Sodium / Q000378:metabolism; D012965:Sodium Chloride / Q000494:pharmacology*
D002104:Cadmium; D002734:Chlorophyll; D012965:Sodium Chloride; D012964:Sodium; D011188:Potassium; D002118:Calcium