, Volume 260, Issue 1, pp 131–137 | Cite as

Differences in response between haploid and diploid isomorphic phases of Gracilaria verrucosa (Rhodophyta: Gigartinales) exposed to artificial environmental conditions

  • Christophe Destombe
  • José Godin
  • Marc Nocher
  • Sophie Richerd
  • Myriam Valero
2. Taxonomy and general biology


This study tests the responses of juvenile gametophytes and tetrasporophytes (holdfast stage) of the isomorphic alga Gracilaria verrucosa under different environmental conditions.

Estimations of survival and growth of holdfasts of haploid and diploid juvenile individuals were performed in natural sea-water and artificial culture medium, and under stringent conditions using lead as a toxin and ultra violet radiation as a mutagen. Results indicate that (i) holdfasts of haploid juveniles grow better than diploids in non-optimal medium conditions; (ii) holdfasts of diploid juveniles have a better tolerance to lead than haploids; and (iii) slight advantage of holdfasts of diploid juveniles grow better than haploids under U.V. radiation.

Key words

Rhodophyta Gracilaria verrucosa evolution of ploidy lead toxicity ultra-violet mutagen survival rates growth 


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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • Christophe Destombe
    • 1
  • José Godin
    • 1
  • Marc Nocher
    • 1
  • Sophie Richerd
    • 1
  • Myriam Valero
    • 1
  1. 1.Laboratoire de Génétique et Evolution des Populations Végétales, URA CNRS 1185, GDR 'Algues' 1002, Bât SN2Université des Sciences et Technologies de LilleVilleneuve d'Ascq CedexFrance

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