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• W3193203186 abstract "This study assessed the early effects of riboflavin and lumichrome produced by the bacterium Azospirillum brasilense on mitigating the stress of salinity on the growth and metabolic status of Chlorella sorokiniana. C. sorokiniana was grown in a synthetic growth medium (SGM) at three salt levels (0%, 1.5%, and 3% NaCl) and under four treatments: (1) C. sorokiniana growing alone; (2) C. sorokiniana co-cultured with A. brasilense; (3) C. sorokiniana supplemented with synthetic riboflavin; and (4) C. sorokiniana supplemented with lumichrome, mimicking the riboflavin and lumichrome concentrations naturally produced by A. brasilense. Cell density, total carbohydrates, total and neutral lipids, chlorophyll a and b, and carotenoids contents, proline accumulation, and activity of superoxide dismutase (SOD) were analyzed. Increasing salinity affected the growth rate, cell size, and cell density of C. sorokiniana, induced proline accumulation, and made the total-lipid concentration higher than the carbohydrate concentration. The neutral lipids, chlorophylls, and SOD showed higher values at 1.5% NaCl. Riboflavin and lumichrome showed significant effects on the analyzed variables. Lumichrome at 1.5% salinity induced an early but transient growth response, making carbohydrate production higher than the total lipid production. By contrast, riboflavin enhanced SOD activity and reduced proline accumulation at all the salinity levels. Longer incubation times resulted in effects similar to those of lumichrome in the analyzed metabolites, thus suggesting the conversion of riboflavin into lumichrome. The microalga−bacteria co-cultures at all salinity levels exhibited growth promotion, with consistent effects at the different incubation times and superior magnitude to that presented by lumichrome or riboflavin alone, showing an alleviating effect of the saline stress through osmoregulation with increased carbohydrate concentration and antioxidant activity, but not with increased proline or total lipid concentration. These findings suggest that Azospirillum brasilense can be used as an alternative to mitigate saline stress effects in microalgae cultured in low-salinity waters." @default.
• W3193203186 created "2021-08-16" @default.
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• W3193203186 date "2021-10-01" @default.
• W3193203186 modified "2023-09-27" @default.
• W3193203186 title "The immediate effect of riboflavin and lumichrome on the mitigation of saline stress in the microalga Chlorella sorokiniana by the plant-growth-promoting bacterium Azospirillum brasilense" @default.
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• W3193203186 doi "https://doi.org/10.1016/j.algal.2021.102424" @default.
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