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Protoplast regeneration from gametophytes and sporophytes of some species in the order Laminariales (Phaeophyceae)

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Summary

Protoplasts were isolated from sporophytes and from gametophyte cultures of several species in the order Laminariales. For each example, the isolation and culture procedures were investigated systematically, to identify conditions leading to plant regeneration. After dedifferentiation through a filamentous stage, protoplasts isolated from adultLaminaria saccharina sporophytes regenerated polystichous bladelets. In contrast, cells isolated fromLaminaria digitata sporophytes proved recalcitrant in culture, except when the donor plants were undifferentiated sporelings. The most critical factors for protoplast development were the origin of explants, the osmoticum used for cell isolation, cultivation in plain seawater, and the absence of stress during the first two weeks of culture. We also found that protoplast isolation from the sporophytes of members of the Laminariales results in the release of hydrogen peroxide, up to 5–120 μM final concentration in the macerating medium, a characteristic which may be related to protoplast recalcitrance. Protoplasts isolated from the gametophytic phase readily regenerated into normal gametophytes, capable of gametogenesis and producing sporophytes by fertilization.

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Abbreviations

F.W.:

fresh weight

MES:

(2-N-morpholino)ethane-sulfonic acid

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Benet, H., Ar Gall, E., Asensi, A. et al. Protoplast regeneration from gametophytes and sporophytes of some species in the order Laminariales (Phaeophyceae). Protoplasma 199, 39–48 (1997). https://doi.org/10.1007/BF02539804

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  • DOI: https://doi.org/10.1007/BF02539804

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