Institut National des Sciences et Technologies de la Mer-Centre Kheiredine, 29 Rue Général Kheiredine, 2015, Le Kram, Tunisie.
Sci Rep. 2022 Jun 30;12(1):11095. doi: 10.1038/s41598-022-15303-6.
The genus Gracilaria, largest biomass producer in coastal regions, encompasses a wide range of species including Gracilaria gracilis. Nowadays, there is a spate of interest in its culture in lagoon where the water sulfate concentration is variable. A laboratory culture was carried out to determine the sulfate concentration effect on their growth as well as their biochemical composition, which were 2.5, 27 or 50 mM, referred to as SSS (sulfur starved seawater), SW (seawater) and SES (sulfur enriched seawater).We found that the sulfate content of the surrounding medium is a key parameter influencing both the alga growth and its composition. However, seawater proved to be the most suitable environment to sustain alga growth, proteins, R-phycoerythrin and agar yields, but sulfur enrichment and starvation affects them. The sulfate degree of agar and therefore its quality is related to the medium sulfate concentration. We conclude that sulfur starvation (2.5 mM) for three weeks, led to severe growth retardation, lower agar yield and quality and indicated the limit potential of G. gracilis for mariculture under these conditions. These results demonstrated that the success of G. gracilis culture in the lagoon is feasible if sulfate concentration is closer to that of seawater.
江蓠属是沿海地区最大的生物量生产者，其物种范围广泛，包括江蓠。如今，人们对在硫酸盐浓度变化的泻湖养殖它产生了浓厚的兴趣。我们进行了实验室培养，以确定硫酸盐浓度对其生长和生化成分的影响，浓度分别为 2.5、27 或 50 mM，分别称为 SSS（缺硫海水）、SW（海水）和 SES（富硫海水）。我们发现，周围介质中的硫酸盐含量是影响藻类生长及其成分的关键参数。然而，海水被证明是维持藻类生长、蛋白质、藻红蛋白和琼脂产量最适宜的环境，但富硫和缺硫会影响它们。琼脂的硫酸盐程度及其质量与培养基中硫酸盐浓度有关。我们得出结论，三周的缺硫（2.5 mM）导致严重的生长迟缓、琼脂产量和质量降低，并表明在这些条件下，G. gracilis 进行海水养殖的潜力有限。这些结果表明，如果硫酸盐浓度更接近海水，江蓠在泻湖中的养殖是可行的。
