Blade density variations between cultivated sugar kelp strains are dependent on the genetic origin
Cohen, J.; Cusumano, C.; Timmermans, K. (2025). Blade density variations between cultivated sugar kelp strains are dependent on the genetic origin. Algal Research 91: 104220. https://dx.doi.org/10.1016/j.algal.2025.104220
Optimizing and standardizing seeding practices is essential to ensure high and reliable yields of cultivated Saccharina latissima (Laminariales, sugar kelp) and realize the development of large-scale cultivation. In parallel, selective breeding programs, for which worldwide genetic resources are used, can unlock possibilities for high-yielding strain development. The wide diversity of genetic material that is used in breeding programs, however, adds an extra layer of complexity when aligning and optimizing seeding practices for these different strains; large variations in blade density are observed when different strains are tested. This may be the result of variations in gametogenesis and juvenile sporophyte development that skew optimal seeding practices. In this study we evaluated the effectiveness of different sporophyte seeding times and seeding densities for increasing blade densities and balancing the observed variations in blade density when cultivating different S. latissima strains. The seeding time appeared to be a key factor in determining blade densities, whereas the seeding density only had a minor impact. Nonetheless, we did not find evidence that adapting seeding practices can compensate for the varying blade densities observed between strains. This leads us to a more general conclusion that blade densities on cultivated seaweed lines are genetically predisposed and/or influenced by (a)biotic factors that impair the development of certain strains. This would imply that blade density can serve as a selectable trait in breeding programs.
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