Effects of nitrogen on growth and carbohydrate formation in Porphyridium cruentum

Razaghi, AliGothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences,University of Gothenburg (författare)

The microalga Porphyridium cruentum (Rhodophyta) has several industrial and pharmaceutical uses, especially for its polysaccharide production. This study aimed to investigate the influence of nitrogen levels as reflected by altered N:P ratios on the production and content of biomass and carbohydrate. N:P molar ratios were altered in batch cultures to range from 1.6 to 50 using the Redfield ratio of 1:16 as reference. Algal growth (estimated as final cell number, biomass concentration and maximum specific growth rate) was negatively affected at low N:P ratios. The optimal N:P ratio for growth was identified at 35-50, with specific growth rates of 0.19 day(-1) and maximum cell concentrations of 59 center dot 10(8) cells L-1 and 1.2 g dry weight of biomass L-1. In addition, variation in cell size was seen. Cells with larger diameters were at higher N:P ratios and smaller cells at lower ratios. The cellular carbohydrate content increased under reduced nitrogen availability. However, because accumulation was moderate at the lowest N:P ratio, 0.4 g per g dry weight biomass compared to 0.24 at the Redfield ratio of 16:1, conditions for increased total carbohydrate formation were identified at the N:P ratios optimal for growth. Additionally, carbohydrates were largely accumulated in late exponential to stationary phase.

Godhe, Anna,1967Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences,University of Gothenburg(Swepub:gu)xgodan (författare)
Albers, Eva,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)albers (författare)
Göteborgs universitetInstitutionen för biologi och miljövetenskap (creator_code:org_t)

Ingår i:Central European Journal of Biology: Walter de Gruyter GmbH9:2, s. 156-1621895-104X1644-3632
Ingår i:Open Life Sciences: Walter de Gruyter GmbH9:2, s. 156-1622391-5412

Av författaren/redakt...: Razaghi, Ali; Godhe, Anna, 196 ...; Albers, Eva, 196 ...

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Industriell biot ...; och Bioprocessteknik

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