We examined the growth tolerance, bioremoval efficacy, and metabolomic profiles of the cellular responses of Chlorella pyrenoidosa to phenol and 4-fluorophenol. We found that C. pyrenoidosa can tolerate exposure to 100 mg/L of phenol and 4-fluorophenol, and the growth of algal cells had a significant hormesis of inhibition first and then promotion. Up to 70% bioremoval of phenol and 4-fluorophenol may occur after 240 h of treatment. Superoxide dismutase (SOD) and CAT activities, malondialdehyde (MDA) content, and reactive oxygen species (ROS) in algal cells in the phenol- and 4-fluorophenol-treated groups were similar or lower than in the control group. Furthermore, photosynthetic pigment and glycerophospholipid contents were significantly upregulated in both phenol- and 4-fluorophenol-treated groups, as indicated by the metabolomic analysis of C. pyrenoidosa, resulting in the vigorous growth of algal cells compared to the control group. Therefore, C. pyrenoidosa can be an excellent biosorbent for phenol and 4-fluorophenol.
Hydrogen sulfide (H 2 S) is recognized for its beneficial role in postharvest fruit and vegetable preservation. Postharvest goji berries are easy to mildew and rot which reduce the nutritional value, flavor, and shelf life. Hydrogen sulfide treatment could improve the quality attributes of postharvest goji berry (Lycium barbarum L.); however, it is not clear that the effects of H 2 S at the transcriptional level in postharvest goji berries. Our data revealed that the differentially expressed genes (DEGs) of fresh goji fruits after H 2 S treatment were different with different storage time. There were 523 DEGs in the three comparison groups after H 2 S treatment on the 2 nd , 4 th and 6 th day of storage. In the pathway of KEGG metabolic function, most of the DEGs were conserved in carbohydrate metabolism, secondary metabolites biosynthesis, amino acid metabolism, lipid metabolism, energy metabolism, the metabolic pathways of terpenoids and polyketones. The genes in the phenylpropanoid biosynthesis, flavonoid biosynthesis, starch, and sucrose metabolism pathway were selected and validated by quantitative real-time PCR (qRT-PCR). Our results provide insights into the effect of H 2 S on postharvest goji berries at the transcriptional level and provide the basis for application of H 2 S as gas regulator for preservation of goji berry.
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