کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4412388 1307636 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ecophysiological tolerance of Elodea canadensis to nickel exposure
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Ecophysiological tolerance of Elodea canadensis to nickel exposure
چکیده انگلیسی

Biological accumulation of nickel and concomitant ecophysiological responses were studied in the leaves of Elodea canadensis treated with different concentrations of Ni (1–50 μM) for 5 d. In low concentrations nickel was accumulated mainly in the soluble protein fraction, which correlated with its highest observed accumulation coefficient. In higher concentrations, Ni binding in the non-protein soluble fraction was observed. The effects of increasing nickel concentrations on the accumulation of photosynthetic pigments, gas exchange rates, lipid peroxidation, biosynthesis of thiol-containing compounds and the activity of selected enzymes – markers of oxidative stress were investigated. The appearance of several new polypeptides with apparent molecular weights below 20 kDa, was found by SDS–PAGE in Ni-treated Elodea leaves. Our results indicate that Ni, in concentrations up to 10 μM could induce sub-lethal oxidative stress in Elodea leaves. In response, plants developed detoxification mechanisms including an enhanced biosynthesis of thiol-containing compounds which facilitated Ni accumulation and sequestration in plant tissues effectively. Hence, E. canadensis could be used in the biological removal of Ni from polluted water up to 10 μM concentration.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 77, Issue 3, October 2009, Pages 392–398
نویسندگان
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