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Parthenogenesis, apogamy and apospory in Alaria crassifolia (Laminariales)

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Abstract

In cultures of Alaria crassifolia Kjellman, unfertilized eggs developed normally into haploid sporophytes which differentiated into a holdfast, stipe and blade with a midrib. The terminal cells of a male gametophyte grew apogamously into haploid sporophytes with narrow blades which lack the midrib. Further, diploid gametophytes were formed by apospory from vegetative cells of a diploid sporophyte. They were monoecious and their fertilized eggs developed into tetraploid sporophytes. Nuclear phases of the sporophytes and gametophytes concerned were confirmed by cytological observations.

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Author notes

  1. H. Nakahara

    Present address: Department of Fisheries Faculty of Agriculture, Kyoto University, Kyoto, Japan

Authors and Affiliations

  1. Institute of Algological Research, Faculty of Science, Hokkaido University, Bokoiminamimachi, Muroran, Japan

    H. Nakahara & Y. Nakamura

Authors
  1. H. Nakahara
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  2. Y. Nakamura
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Additional information

Communicated by M. Anraku, Nagasaki

This work was supported by Grant No. 38803 from the Ministry of Education of Japan.

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Nakahara, H., Nakamura, Y. Parthenogenesis, apogamy and apospory in Alaria crassifolia (Laminariales). Marine Biology 18, 327–332 (1973). https://doi.org/10.1007/BF00347797

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  • DOI: https://doi.org/10.1007/BF00347797

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