Abstract Adaptation and selection of
Arthrospira platensis
strains, for cultivation in brackish water with
excess boron (B) in the Lluta Valley can become an interesting alternative that would allow to extend
these cultures to areas that possess the environmental conditions, but that lack the fresh water needed
to do it. Strains TX98 and P88 were evaluated in laboratory conditions with three different media of
brackish water and with the white medium, the Zarrouk modified medium (MZM). The growing media
with brackish water with a B concentration present in the Lluta River of 20 mgL
-1 (B20) and medium
with 30 mgL
-1 (B30), and 10 mg L
-1 of B (B10). The effect of the different media on the growing
parameters with a culture temperature of 25 ± 1ºC in the three treatments, strains TX98 and P88
triplicate,
Arthrospira platensis, showed tolerance. It was statistically determined that in the growth, the
two strains, the three treatments and in the interrelation of both there were significant differences (p <
0.05). The TX98 strain reached a concentration of 1.139 g L
-1 (dry weight) in brackish water with
medium B20. Therefore, the highest rate of specific growth (μmax) was obtained with the TX98 strain
grown in the brackish medium B30 and the lowest duplication time (0.597 days). Cells grown in
brackish water with B had a slightly biochemically modified composition with the white, in relation to the
protein content, in the cases in which there are differences in the B content, specifically B30 treatment.
For the culture with brackish water from the Lluta River, the TX98 strain is recommended with 10 mg of
B using a laboratory to pilot scale.
