Insigths Into Secondary Carotenoid Synthesis in the Green Algae Haematococcus Pluvialis

1998 ◽  
pp. 3285-3288
Author(s):  
K. Grünewald ◽  
C. Hagen ◽  
W. Braune
Keyword(s):  
Green Algae ◽  
Haematococcus Pluvialis ◽  
Secondary Carotenoid ◽  
Carotenoid Synthesis

scholarly journals Selective Inhibition on Growth and Photosynthesis of Harmful Cyanobacteria (Microcystis aeruginosa) by Water Soluble Substances of Dendranthema indicum Flowers

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 2014
Author(s):  
Yunni Gao ◽  
Fang Zhang ◽  
Jing Wu ◽  
Hui Yang ◽  
Jing Dong ◽  
...  
Keyword(s):  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Solid Phase ◽  
Haematococcus Pluvialis ◽  
Growth Promotion ◽  
Selective Inhibition ◽  
Water Soluble ◽  
Cyanobacterial Blooms ◽  
Aqueous Extracts ◽  
Active Substances

Harmful cyanobacterial blooms become serious environmental issues in various waterbodies, including aquaculture ponds, which inherently need a high biomass and healthy composition of phytoplankton to sustain their high productivity. Indoor bioassays were conducted to investigate the effects of an aqueous extract of Dendranthema indicum flowers on cyanobacteria and green algae species. The thermal stability and polarity of the water-soluble active substances of D. indicum flowers were also assessed based on the growth and photosynthesis responses of Microcystis aeruginosa. There was obvious growth promotion of green algae, including Chlorella vulgaris, Kirchneriella sp. and Haematococcus pluvialis and strong growth inhibition of toxigenic and non-toxigenic M. aeruginosa by aqueous extracts of D. indicum flowers at concentrations ranging from 0.5 to 2.0 g·DW·L−1. The cell concentrations of M. aeruginosa and C. vulgaris were 46.5% and 242.2% of those in the corresponding controls after a 10-day exposure to aqueous extracts of D. indicum flowers at 1.0 g·DW·L−1. There must be some water-soluble active allelochemicals released from D. indicum flowers that are responsible for the selective inhibition of M. aeruginosa rather than green algae. The inhibition ratio of the growth and photosynthesis of M. aeruginosa by aqueous extracts of D. indicum flowers at 2.0 g·DW·L−1 prepared with water at 25 °C and 100 °C were above 90% and 80% compared to the cell density and performance index on absorption basis (PIABS) value of M. aeruginosa in the control on day 6, without significant differences. It indicates that the active substances of D. indicum flowers were thermally stable. The methanol fraction eluted from solid phase extraction (SPE)-enriched aqueous extracts of D. indicum flowers showed the strongest inhibition of the growth and photosynthesis of M. aeruginosa compared to the other four fractions. It indicates that the most polar substances of D. indicum flowers were responsible for the selective inhibition of M. aeruginosa. More experiments are required to identify the responsible active substances and reveal the underlying mechanisms of aqueous extracts of D. indicum flowers that selectively inhibit cyanobacteria and regulate the phytoplankton community structure.

Primary metabolism is associated with the astaxanthin biosynthesis in the green algae Haematococcus pluvialis under light stress

2020 ◽  
Vol 46 ◽  
pp. 101768 ◽  
Author(s):  
Chaoyang Hu ◽  
Dandan Cui ◽  
Xue Sun ◽  
Jianxin Shi ◽  
Nianjun Xu
Keyword(s):  
Green Algae ◽  
Haematococcus Pluvialis ◽  
Light Stress ◽  
Primary Metabolism

Secondary Carotenoid Synthesis in Microalgae

1992 ◽  
pp. 47-50 ◽  
Author(s):  
A. J. Tsavalos ◽  
M. Harker ◽  
M. Daniels ◽  
A. J. Young
Keyword(s):  
Secondary Carotenoid ◽  
Carotenoid Synthesis

Stimulated Growth of Green Algae Haematococcus Pluvialis Under Different Environmental Conditions

2018 ◽  
Vol 18 (1) ◽  
pp. 53-61
Author(s):  
Arevik Minasyan
Keyword(s):  
Growth Rate ◽  
Green Algae ◽  
Haematococcus Pluvialis ◽  
Parallel Testing ◽  
Anti Cancer ◽  
Health Promoting ◽  
Sustainable Cultivation ◽  
Anti Oxidant ◽  
Culture Growth ◽  
Cancer Agent

Abstract Haematococcus pluvialis is a genus of green algae that keeps the high interest of the scientists for decades due to its capacity to synthesize astaxanthin. Among many others, astaxanthin is one of the most demanded natural anti-oxidant and the product of the future. It has the widest usage as source of nutrient rich food and health promoting compounds. Astaxanthin has got various applications in the nutraceuticals as immune system enhancer and anti-cancer agent, in the cosmetics as anti-aging component, as additive to food, as well as in the aquaculture industries. As a key requirement for the research in this field is to find out the better conditions and media to stimulate the H.pluvialis higher growth rate to reach in the field of microalgae economically sustainable cultivation and processing. The effect of WC versus BG-11 media to enhance growth rate of Haematococcus pluvialis has been examined. This study employed a parallel testing of stimulating effect of extra vitamins versus phosphorus. Combination of mentioned parameters with gentle shacking have been determined as multiple effectors that contribute to green algae cultures to grow to high density. Importantly, this study demonstrates that extra phosphorus contribute to growth rate of H.pluvilais positively, meanwhile addition of extra vitamins in combination with extra phosphorus impact both positively and negatively to promote cells division. Shacking influences the culture growth as either stimulator or repressor.

Effect of silencing lycB gene on the carotenoid synthesis in Haematococcus pluvialis

2013 ◽  
Vol 35 (2) ◽  
pp. 233-240 ◽  
Author(s):  
Wen-Fang GONG ◽  
Li-Jing LU ◽  
Xin LIU ◽  
Xi-Wen CHEN ◽  
De-Fu CHEN
Keyword(s):  
Haematococcus Pluvialis ◽  
Carotenoid Synthesis

scholarly journals Accumulation of phytoene and astaxanthin and related genes expression in Haematococcus pluvialis under sodium acetate stress

2020 ◽  
Vol 29 ◽  
pp. 155-164
Author(s):  
X Cong ◽  
X Zang ◽  
M Dong ◽  
Z Wang ◽  
B He ◽  
...  
Keyword(s):  
High Performance ◽  
Sodium Acetate ◽  
Haematococcus Pluvialis ◽  
Enzymatic Catalysis ◽  
Transcriptional Level ◽  
Genes Expression ◽  
Astaxanthin Production ◽  
Carotenoid Synthesis ◽  
The Relationship ◽  
Β Carotene

Phytoene and astaxanthin are 2 important carotenoids in the green alga Haematococcus pluvialis. Under environmental stress, the synthesis of phytoene in H. pluvialis increases significantly, and phytoene is converted to astaxanthin through enzymatic catalysis. This paper analyzes the relationship between astaxanthin and phytoene accumulation in carotenoid synthesis pathways under different concentrations of sodium acetate (NaAc) by high-performance liquid chromatography. The highest concentrations of phytoene and astaxanthin were observed at the NaAc concentration of 6 g l-1 on the 12th day of induction. The highest astaxanthin concentration achieved was 2.26 ± 0.28%. Therefore, we concluded that 6 g l-1 NaAc and induction for 12 d provided the optimal inducing conditions for astaxanthin accumulation in H. pluvialis. psy, pds, lcyB, β-carotene ketolase crtw, and crtz, which are genes related to phytoene and astaxanthin synthesis, were cloned and studied at the transcriptional level. crtw and crtz were continuously up-regulated since the first day of induction, while psy, pds, and lcyB were continuously up-regulated starting on the 3rd day of induction. These findings are important for enhancing our understanding of the mechanism of accumulation of phytoene and astaxanthin in H. pluvialis and provide a foundation for identifying the induction conditions necessary for optimizing astaxanthin production and increasing astaxanthin yields.

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