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Titre du document / Document title

Thermogenesis of three species of Arum from Crete

Auteur(s) / Author(s)

SEYMOUR Roger S. (1) ; GIBERNAU Marc (2) ; PIRINTSOS Stergios ArG. (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Ecology and Evolutionary Biology, University of Adelaide, Adelaide, SA 5005, AUSTRALIE
(2) Laboratoire d'Evolution et Diversité Biologique UMR 5174, Université Paul Sabatier, 31062 Toulouse, FRANCE
(3) Department of Biology, University of Crete, PO Box 2208, 71409, Heraklion, GRECE

Résumé / Abstract

Inflorescences of arum lilies have a three-part spadix with a scent-producing, sterile appendix above two bands of fertile male and female florets. The appendix and male florets are thermogenic, but with different temporal patterns. Heat-production was measured in Arum concinnatum, A. creticum and A. idaeum. The male florets of A. concinnatum showed a 3 d continuous episode of thermogenesis with three waves, and the appendix warmed in a single, 6 h episode. Maximum fresh-mass-specific CO2 production rate was 0.17 μmol s-1 g-1 to achieve a 10.9 °C temperature elevation by the appendix, and 0.92 μmol s-1 g-1 to achieve a 4.8 °C elevation by male florets. Reversible, physiological temperature regulation was not evident in either tissue. Respiration increased with tissue temperatures with Q10 values of 1.8-3.9, rather than less than 1.0 as occurs in thermoregulatory flowers. Experimental step changes in temperature of appendix and male floret tissues also failed to show thermoregulatory responses. The patterns of thermogenesis therefore appear to be fixed by the temporal sequence of blooming. Thermogenesis in the alpine species, A. creticum and A. idaeum, was significantly lower than in the lowland A. concinnatum, possibly related to difficulty in raising floral temperature in their cold and windy habitat.

Revue / Journal Title

Plant, cell and environment    ISSN  0140-7791   CODEN PLCEDV 

Source / Source

2009, vol. 32, no10, pp. 1467-1476 [10 page(s) (article)] (3/4 p.)

Langue / Language

Anglais

Editeur / Publisher

Blackwell, Oxford, ROYAUME-UNI  (1978) (Revue)

Mots-clés anglais / English Keywords

Spermatophyta

;

Angiospermae

;

Monocotyledones

;

Plant ecology

;

Araceae

;

Temperature regulation

;

Pollination

;

Inflorescence

;

Species

;

Thermogenesis

;

Mots-clés français / French Keywords

Spermatophyta

;

Angiospermae

;

Monocotyledones

;

Ecologie végétale

;

Araceae

;

Régulation température

;

Pollinisation

;

Inflorescence

;

Espèce

;

Thermogenèse

;

Mots-clés espagnols / Spanish Keywords

Spermatophyta

;

Angiospermae

;

Monocotyledones

;

Ecología vegetal

;

Araceae

;

Regulación temperatura

;

Polinización

;

Inflorescencia

;

Especie

;

Termogénesis

;

Mots-clés d'auteur / Author Keywords

Araceae

;

arum lily

;

inflorescence

;

pollination

;

temperature regulation

;

Localisation / Location

INIST-CNRS, Cote INIST : 17987, 35400019620427.0160

Nº notice refdoc (ud4) : 21914715



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