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Selected algae spices

During the project 5 microalgae strains were chosen to test their growth and productivity in laboratory experiments.


The chosen strains are: Chlorella sorokiniana,Chlorella vulgaris,Scenedesmus quadricauda,Spirulina platensisand Synechocystissp. PCC6803. Anabaenasp. PCC7120 was also tested but it did not grow in the different tested culture conditions and was disregarded in later experiments

 

Original environment

Optimal temperature (°C)

Optimal light intensity (µmol m-1 s-1)

Optimal pH

Recommended growth media

Speciality

Chlorella vulgaris

fresh water

20-28

50-300

6-8

BBM

Good biomass yield, presence of phytohormone-like molecules

Chlorella sorokiniana

fresh water

20-28

50-300

6-8

BBM

Good biomass yield, presence of phytohormone-like molecules

Scenedesmus quadricauda

fresh water

20-28

50-300

6-8

BBM

Good biomass yield, presence of phytohormone-like molecules

Spirulina platensis

fresh water

28-35

150-200

9-10

SOT

High microelement content, high temperature tolerance, high alkalinity

Anabaena sp. PCC 7120

fresh water

25-30

50-200

7-8

BG11

Ability to fix N2

Synechocystissp. PCC 6803

fresh water

25-30

50-200

7-8

BG11

Well documented cyanobacterial modell organism

1. Table General characteristics and short description of the chosen algae strains.

 During the open-pond alga production only Chlorellasp. and Scenedesmussp. were able to adapt to the sometimes extreme conditions occurred in the greenhouse. Other alga strains however appeared and were able to grow in the alga suspensions:

Coelastrellasp.

This microalga is able to withstand temperatures over 50°C for more than 8 h and produces pigments including astaxanthin, lutein, canthaxanthin and β-carotene (ordered by polarity of these compounds) after the cells are stressed for a period of time.

 Acutodesmus obliquus

These microalgae are cosmopolitan genus with small globular cells. It includes strains with high temperature tolerance as some strains can grow between 15-40 °C. They are used in open pond systems because of their high autotrophic growth rate.

 Actinastrumsp.

Found in the plankton of nutrient-rich lakes and ponds. Can be abundant in sewage ponds, particularly during summer. It is a very common contaminating alga in open ponds.




2018. April 19.