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[Polygamy in Atriplex halimus L. (Chenopodiaceae)].

A Talamali1, P Dutuit, A Le Thomas

  • 1Laboratoire d'écotechnologie, université de Paris-Sud, tour E1-2, 92296 Châtenay-Malabry, France.

Comptes Rendus De L'Academie Des Sciences. Serie III, Sciences De La Vie
|March 31, 2001
PubMed
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Atriplex halimus exhibits trimonoecious reproductive strategies, displaying male, female, and bisexual flowers. This study reveals incomplete descriptions of its inflorescence and flower morphology, challenging previous classifications.

Area of Science:

  • Botany
  • Plant Morphology
  • Reproductive Biology

Background:

  • Previous classifications of Atriplex halimus suggested monoecious or dioecious reproductive systems.
  • Incomplete descriptions of Atriplex halimus inflorescence and flower morphology have persisted.
  • Hermaphroditic flowers in Atriplex halimus were previously undocumented.

Purpose of the Study:

  • To provide a comprehensive description of Atriplex halimus inflorescence and flower morphology.
  • To investigate the reproductive system of Atriplex halimus, challenging existing classifications.
  • To identify and characterize hermaphroditic flower types in Atriplex halimus.

Main Methods:

  • Morphological analysis of Atriplex halimus inflorescences and flowers.
  • Ontogenic studies to observe developmental stages of flowers.

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  • Comparative analysis with existing botanical classifications.

    • Main Results:

    • Atriplex halimus displays a trimonoecious reproductive system, featuring male, female, and bisexual flowers.
    • Hermaphroditic flowers, morphologically and functionally bisexual, were identified.
    • Inflorescence structure was detailed, based on spike and dichasium units.
    • A physiological gradient influencing sex expression along the inflorescence axis was discussed.

    Conclusions:

    • Atriplex halimus is polygam, specifically trimonoecious, not strictly monoecious or dioecious.
    • The discovery of hermaphroditic flowers necessitates a revision of Atriplex halimus reproductive biology.
    • Understanding the sex distribution and physiological gradients is crucial for Atriplex halimus reproductive studies.