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Nectar regulation in Euphorbia tithymaloides L., a hummingbird-pollinated Euphorbiaceae

Veiga Blanco, T. ; Galetto, L. ; Machado, I. C. Dafni, A.

Plant biology (Stuttgart, Germany), 2013-09, Vol.15 (5), p.910-918 [Periódico revisado por pares]

England: Blackwell Publishing Ltd

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  • Título:
    Nectar regulation in Euphorbia tithymaloides L., a hummingbird-pollinated Euphorbiaceae
  • Autor: Veiga Blanco, T. ; Galetto, L. ; Machado, I. C.
  • Dafni, A.
  • Assuntos: Animals ; Birds ; Carbohydrate Metabolism ; Cyathium protogyny ; Euphorbia - metabolism ; Euphorbia - physiology ; Flowers - metabolism ; Flowers - physiology ; Homeostasis ; homeostatic mechanism ; hummingbird preference ; Inflorescence ; nectar ; Plant Development - physiology ; Plant Nectar - metabolism ; Plant Nectar - secretion ; Pollination ; Reproduction ; sexual phases
  • É parte de: Plant biology (Stuttgart, Germany), 2013-09, Vol.15 (5), p.910-918
  • Notas: ark:/67375/WNG-7XXQPTCT-M
    istex:18CD8A95E6375C318545DCFAA06D1D9A8E603489
    Universidad Nacional de Córdoba (SECyT-UNC) and CONICET
    Carrera del Investigador
    Erasmus-Mundus interchange programme
    ArticleID:PLB695
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Floral sexual phases can differ in nectar production and might be under selective pressure by pollinators. We studied Euphorbia tithymaloides, which has inflorescences that are initially female and then hermaphroditic. Volume and concentration of nectar were measured in both stages. Nectar production and the effect of extractions were determined using sets of bagged inflorescences; inflorescences in the hermaphroditic phase had higher values of nectar concentration, volume and sugar mass than inflorescences in the female phase. Nectar resorption was detected in senescent inflorescences. To test for homeostatic nectar regulation, artificial nectar was added and the response assessed after 24 h. The experiments showed that concentration and sugar mass are regulated within a narrow range, and the homeostatic points differ between the two sexual phases. These differences in nectar can be detected by hummingbirds, which prefer the female stage. Resorption and secretion seem to be part of a homeostatic mechanism by which nectar attributes are maintained to optimise sugar recovery.
  • Editor: England: Blackwell Publishing Ltd
  • Idioma: Inglês
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