期刊
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
卷 99, 期 7, 页码 3249-3258出版社
SPRINGER
DOI: 10.1007/s00253-014-6218-1
关键词
Chromium; Nitrogen; Chlorella vulgaris; Gene transcript; Subcellular structure
资金
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13096]
The aim of the present study was to investigate the protective effect of ammonium (NH4 (+)) on Cr toxicity to the freshwater alga Chlorella vulgaris. We followed an array of cellular functions and biomolecules in C. vulgaris cells exposed to 50 or 100 mu M Cr at three different initial NH4 (+) concentrations (0.5, 3, and 10 mM). The results showed that Cr strongly inhibited cell yield of C. vulgaris, but 10 mM NH4 (+) could decrease by more than two-fold Cr toxicity on cell yield compared to exposure to 0.5 mM NH4 (+). Cr toxicity on gene transcripts and cellular substructure was also much lower at high than at low NH4 (+). Our results suggest that this protecting effect of NH4 (+) on intracellular Cr toxicity could be due to several factors, such as enhance uptake of phosphorus, increase in C and N assimilation efficiency, and increase transcription of photosynthesis-related genes.
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