氯化钠显著改善了镉诱导的盐生植物海马齿的生长抑制。
Cd-induced growth reduction in the halophyte Sesuvium portulacastrum is significantly improved by NaCl.
作者信息
Ghnaya Tahar, Slama Inès, Messedi Dorsaf, Grignon Claude, Ghorbel Mohamed Habib, Abdelly Chedly
机构信息
Laboratoire d'Adaptation des Plantes aux Stress Abiotiques, Centre de Biotechnologie, BP 901, Hammam-Lif, Tunisia.
出版信息
J Plant Res. 2007 Mar;120(2):309-16. doi: 10.1007/s10265-006-0042-3. Epub 2006 Oct 5.
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.
研究了单独或共同施加镉离子（Cd(2+)）和氯化钠（NaCl）对盐生植物海马齿（Sesuvium portulacastrum L.）生长及Cd(2+)吸收的影响。将幼苗培养于单独含有50或100微摩尔每升Cd(2+)或与100或400毫摩尔每升NaCl组合的环境中。数据表明，单独的Cd(2+)会导致黄化、坏死并抑制生长。然而，向含Cd(2+)的培养基中添加NaCl可恢复生长并减轻毒性。NaCl还增加了地上部积累的Cd(2+)量。所有Cd(2+)处理均降低了钾离子（K(+)）和钙离子（Ca(2+)）向地上部的吸收和运输。不过，地上部钠离子（Na(+)）的积累不受Cd(2+)影响。因此，在Cd(2+)存在的情况下，海马齿仍保持其盐生植物特性。我们认为这种盐生植物可用于从盐污染场地植物提取Cd(2+)。
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