Photosynthetic characterization of two Nannochloropsis species and its relevance to outdoor cultivation
artículo original
Fecha
2020Autor
Vonshak, Avigad
Novoplansky, Nurit
Silva Benavides, Ana Margarita
Torzillo, Giuseppe
Beardall, John
Palacios, Yussi M.
Metadatos
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Despite the increased interest in exploring the potential of algal biomass production for food stock and renewable energy, very
little work has been done in developing reliable screening protocols to enable the identification of species that are best suited to
mass cultivation outdoors. Nannochloropsis is an algal genus identified as a potential source of lipids due to its ability to
accumulate large quantities of these compounds, especially under nutrient-limiting conditions. The objective of the current work
was to use two species of this genus, Nannochloropsis oceanica and N. oculata, as model organisms to develop a protocol that
will allow the evaluation of their capacity to yield high biomass productivity under outdoor conditions. Growing the alga under
different light intensities and measuring growth rate as well as a range of photosynthetic parameters based on light response
curves and variable fluorescence highlighted significant differences between the two species. Our data show that N. oceanica
cells have a better capacity to respond to higher light intensities, as reflected by growth measurements, photosynthetic electron
transport rates, and oxygen evolution as well as their response to the very high photon flux densities expected in outdoor culture.
On the other hand, N. oculata showed a higher tolerance to oxidative stress as reflected in its resistance to the reactive oxygen
species generating compounds Rose Bengal (RB) and methyl viologen (MV). Based on the above evidence, we suggest that
N. oceanica may perform better than N. oculata when grown under high light conditions typically found outdoors in summer,
while N. oculata may perform better than N. oceanica under oxidative stress conditions usually found in outdoor cultures
exposed to a combination of high light and low temperature commonly occurring in winter time.
External link to the item
10.1007/s10811-019-01985-5Colecciones
- Biología [1644]