Influence of Culture Conditions on Growth and Physicochemical Properties of Carrageenans in Gigartina teedii (Rhodophyceae — Gigartinales)

Interactions between environmental variables on growth rate and carrageenan content of Solieria chordalis (Solieriaceae, Rhodophyceae) in culture

“…The interactive effects of temperature, light and salinity on carrageenan yield were similar to those observed on growth. In contrast to the results from other studies, yields were greater at the higher temperature (20 °C); in G. teedii yields decreased with temperatures up to 20 C and increased at higher temperatures (Zinoun et al, 1993), whereas in G. griffithsiae temperatures ranging from 18 °C to 30 °C had no significant effect on yield (Breden & Bird, 1994). At both 10 °C and 20 °C the carrageenan content was highest at 100 /zmol photon m -2 s -1 and full salinity; in contrast, increased carrageenan yields in G. teedii have been reported up to an irradiance levels of 400 mol photon m -2 s -' (Zinoun et al, 1993).…”

“…Gabrielson from Brazil. It is also lower than the maximum values reported for G. teedii (Zinoun et al, 1993) and G. griffithsiae (Breden & Bird, 1994) in culture. Nitrogen concentration, but not form, affected the carrageenan yield; concentrations above 5 M significantly reduced the content.…”

“…and Gigartina teedii (Roth) Lamouroux. Optimal growth rates compare favourably with those obtained by Zinoun et al (1993) (Breden & Bird, 1994) and E. denticulatum (Dawes et al, 1993).…”

“…Responses to environmental interactions are often ignored in studies on algal growth thus limiting the value of the information obtained (e.g. Mairh et al, 1986;Zinoun et al, 1993). In the present study the interaction between light, salinity and temperature was investigated and, as well as finding highly significant main effects, significant interactions were also found.…”

NDP‐sugars, floridoside and floridean starch levels in relation to activities of UDP‐glucose pyrophosphorylase and UDP‐glucose‐4‐epimerase in Solieria chorda l is (Rhodophyceae) under experimental conditions

“…Usually the effects of natural environmental conditions on the production of the cell wall polysaccharides, agars and carrageenans are investigated by seasonal sampling (Whyte et al 1981;Bird 1984;Zinoun and Cosson 1996). Specific environmental conditions such as temperature, photon flux density, nitrogen supply and salinity have been investigated under laboratory conditions (Neish et al 1977;Rotem et al 1986;Zinoun et al 1993). Most of these studies were focused on the amount and quality of macromolecular end-products, mainly floridean starch, agars and carrageenans.…”