期刊
BIORESOURCE TECHNOLOGY
卷 273, 期 -, 页码 368-376出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.11.042
关键词
Microalgae; Mixotrophy; Ammonium toxicity; Chlorophyll fluorescence; Cell components
资金
- National Natural Science Foundation of China [51208533, 51478062]
- Major project of Natural Foundation of Chongqing [cstc2015jcyjBX0111]
To enhance microalgal growth and optimize ammonium utilization, the effect of ammonium on microalgal growth, biochemical composition and photosynthetic performance were investigated by mixotrophic cultivation of microalga Spirulina platensis comparing with autotrophic cultivation. The results indicated that elevated ammonium significantly affected the microalgal growth, but the microalga in mixotrophic cultivation showed better growth and stronger tolerance to higher ammonium. The microalgal proteins were increased by increasing nitrogen concentration. The synthesis of microalgal carbohydrates was inhibited by higher ammonium, especially in mixotrophic cultivation. The addition of ammonium decreased the microalgal lipids in autotrophic cultivation but increased microalgal lipids in mixotrophic cultivation. Ammonium negatively affected the microalgal photosynthetic performance. The inhibition was intensified by elevated ammonium, inducing stronger photosystem protection mechanism, particularly in mixotrophic cultivation. The rate of ammonium inhibition to the microalgal photosystem was quick in the early stage by decreasing electron transport rate of PS II.
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