Journal of Plant Research

, Volume 121, Issue 1, pp 73–82 | Cite as

Thermogenesis and flowering biology of Colocasia gigantea, Araceae

  • Anton Ivancic
  • Olivier Roupsard
  • José Quero Garcia
  • Marie Melteras
  • Tari Molisale
  • Serge Tara
  • Vincent Lebot
Regular Paper

Abstract

The thermogenesis and flowering biology of Colocasia gigantea (Blume) Hook. f. were studied from December 2005 to February 2006 on Espiritu Santo, Vanuatu (South Pacific). Endogenous thermogenesis was measured in two ways: (1) continuously over 5-day periods, and (2) over 3 h during maximum heating. The study showed that heat was generated by the male part of the spadix and probably the lower zone of the sterile region. The temperatures of the male part peaked twice: (1) between 0625 and 0640 (during the female phase) and (2) 24 h later (during the male phase). The average maximum temperature was 42.25 ± 0.14°C during the female phase (16.63°C above the ambient temperature) and 35.14 ± 0.22°C during the male phase (10.61°C above the ambient temperature). In the lower zone of the sterile region, thermogenesis was documented only during the female phase. The average maximum temperature was 35.44 ± 0.41°C (9.82°C above the ambient temperature). Thermogenic heating appeared to be closely associated with the activities of pollinating insects.

Keywords

Colocasia gigantea Flowering biology Inflorescence morphology Pollination biology Thermogenesis 

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Copyright information

© The Botanical Society of Japan and Springer 2007

Authors and Affiliations

  • Anton Ivancic
    • 1
  • Olivier Roupsard
    • 2
  • José Quero Garcia
    • 3
  • Marie Melteras
    • 2
  • Tari Molisale
    • 2
  • Serge Tara
    • 2
  • Vincent Lebot
    • 4
  1. 1.Faculty of AgricultureUniversity of MariborMariborSlovenia
  2. 2.Vanuatu Agricultural Research and Training Center (VARTC)Espiritu SantoVanuatu
  3. 3.INRA, Unité de Recherche sure les Espèces FruitièresVillenave D’OrnonFrance
  4. 4.Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD)Port VilaVanuatu

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