کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10129203 1645206 2018 40 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Biomineralization of strontium and barium contributes to detoxification in the freshwater alga Micrasterias
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم زراعت و اصلاح نباتات
پیش نمایش صفحه اول مقاله
Biomineralization of strontium and barium contributes to detoxification in the freshwater alga Micrasterias
چکیده انگلیسی
The results show that depending on the treatment differently shaped crystals are formed in BaCl2 and Cl2Sr exposed Micrasterias cells. Modern microscopic techniques such as analytical TEM by electron energy loss spectroscopy and Raman microscopy provide evidence for the chemical composition of these crystals. It is shown that barium treatment results in the formation of insoluble BaSO4 crystals that develop within distinct compartments. During strontium exposure long rod-like crystals are formed and are surrounded by membranes. Based on the Raman signature of these crystals their composition is attributed to strontium citrate. These crystals are instable and are dissolved during cell death. During strontium as well as barium treatment cell division rates and photosynthetic oxygen production decreased in dependence of the concentration, whereas cell vitality was reduced only slightly. Together with the fact that TEM analyses revealed only minor ultrastructural alterations as consequence of relatively high concentrated BaCl2 and Cl2Sr exposure, this indicates that biomineralization of Sr and Ba protects the cells from severe damage or cell death at least within a particular concentration range and time period. In the case of Sr treatment where ROS levels were found to be elevated, hallmarks for autophagy of single organelles were observed by TEM, indicating beginning degradation processes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Plant Physiology - Volume 230, November 2018, Pages 80-91
نویسندگان
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