Inbreeding depression in Vriesea gigantea,a perennial bromeliad from southern Brazil |
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Authors: | JAMILLA ALVES TRINDADE SAMPAIO GECELE MATOS PAGGI CAMILA MARTINI ZANELLA MANUELA BRUXEL CLARISSE PALMA‐SILVA MÁRCIA GOETZE MIRIAM VALLI BÜTTOW FERNANDA BERED |
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Institution: | 1. Laboratório de Genética Molecular Vegetal, Departamento de Genética, IB/Universidade Federal do Rio Grande do Sul – UFRGS, P.O. Box 15053, 91501‐970, Porto Alegre‐RS, Brazil;2. Laboratório de Ecologia and Laboratório de Biologia Molecular e Microrganismos,Universidade Federal de Mato Grosso do Sul – UFMS, Campus do Pantanal, P.O. Box 252, 79304‐902, Corumbá‐MS, Brazil;3. Programa de Pós‐Gradua??o em Microbiologia Agrícola e do Ambiente, Universidade Federal do Rio Grande do Sul – UFRGS, 90050‐170, Porto Alegre‐RS, Brazil;4. Instituto de Botanica – IBOT, Divis?o de Fitotaxonomia, 04301‐902, S?o Paulo‐SP, Brazil |
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Abstract: | Inbreeding depression is a reduction of fitness in the progeny of closely related individuals and its effects are assigned to selfing or biparental inbreeding. Vriesea gigantea is a self‐compatible bromeliad species distributed in the Brazilian Atlantic rainforest and habitat destruction and fragmentation and collection have decreased the natural populations. We aim to describe the occurrence of inbreeding depression (δ) in three natural populations of V. gigantea and to correlate this phenomenon with previous studies of fertility, genetic diversity, population genetic structure, gene flow, mating system and seed dispersal in this species. Fifty‐four adult plants were sampled and 108 flowers were used for pollination treatments (selfing, outcrossing and control). For adult plants, we analysed plant and inflorescence height, flower numbers and seed set. In the progenies, evaluated parameters included seed germination and seedling survival rate. The results indicated low to moderate levels of inbreeding depression in V. gigantea (δ = 0.02 to 0.39), in agreement with molecular data from a previous study. Vriesea gigantea populations tolerate some degree of inbreeding, which is consistent with previous results on fertility, mating system, genetic diversity and gene flow. © 2012 The Linnean Society of London, Botanical Journal of the Linnean Society, 2012, 169 , 312–319. |
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Keywords: | Brazilian Atlantic rainforest Bromeliaceae fitness gene flow hand‐pollination experiments mating system |
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