| Texto completo | |
| Autor(es): |
Número total de Autores: 4
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| Afiliação do(s) autor(es): | [1] Univ Rey Juan Carlos, Area Biodiversidad & Conservac, Escuela Super Ciencias Expt & Tecnol, Madrid, Mostoles - Spain
[2] Univ Fed Minas Gerais, Dept Bot, Ave Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG - Brazil
[3] CSIC, Real Jardin Bot, Madrid - Spain
[4] Sao Paulo State Univ UNESP, Inst Biosci, Dept Bot, Phenol Lab, Sao Paulo - Brazil
[5] CSIC, MNCN, Madrid - Spain
Número total de Afiliações: 5
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| Tipo de documento: | Artigo Científico |
| Fonte: | Plant Biology; v. 19, n. 6, p. 963-972, NOV 2017. |
| Citações Web of Science: | 2 |
| Resumo | |
In animal-pollinated hermaphroditic plants, optimal floral allocation determines relative investment into sexes, which is ultimately dependent on flower size. Larger flowers disproportionally increase maleness whereas smaller and less rewarding flowers favour female function. Although floral traits are considered strongly conserved, phylogenetic relationships in the interspecific patterns of resource allocation to floral sex remain overlooked. We investigated these patterns in Cistaceae, a hermaphroditic family. We reconstructed phylogenetic relationships among Cistaceae species and quantified phylogenetic signal for flower size, dry mass and nutrient allocation to floral structures in 23 Mediterranean species using Blomberg's K-statistic. Lastly, phylogenetically-controlled correlational and regression analyses were applied to examine flower size-based allometry in resource allocation to floral structures. Sepals received the highest dry mass allocation, followed by petals, whereas sexual structures increased nutrient allocation. Flower size and resource allocation to floral structures, except for carpels, showed a strong phylogenetic signal. Larger-flowered species allometrically allocated more resources to maleness, by increasing allocation to corollas and stamens. Our results suggest a major role of phylogeny in determining interspecific changes in flower size and subsequent floral sex allocation. This implies that flower size balances the male-female function over the evolutionary history of Cistaceae. While allometric resource investment in maleness is inherited across species diversification, allocation to the female function seems a labile trait that varies among closely related species that have diversified into different ecological niches. (AU) | |
| Processo FAPESP: | 14/13899-4 - Fenologia e filogenias como ferramentas para o entendimento dos efeitos das mudanças climáticas nos trópicos |
| Beneficiário: | Vanessa Graziele Staggemeier |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |