Thermogenesis and flowering biology of Colocasia gigantea, Araceae

Ivancic Anton, Roupsard Olivier, Quéro Garcia José, Melteras Marie, Molisalé Tari, Tara Serge, Lebot Vincent. 2008. Thermogenesis and flowering biology of Colocasia gigantea, Araceae. Journal of Plant Research, 121 (1) : 73-82.

https://doi.org/10.1007/s10265-007-0129-5

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Résumé : 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.

Mots-clés Agrovoc : Colocasia, thermorégulation, anatomie végétale, pollinisation, floraison, inflorescence

Mots-clés géographiques Agrovoc : Vanuatu

Mots-clés complémentaires : Colocasia gigantea

Classification Agris : F63 - Physiologie végétale - Reproduction
F50 - Anatomie et morphologie des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

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