Morphology, secretion composition, and ecological aspects of stipular colleters in Rubiaceae species from tropical forest and savanna

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• 作者：Fernanda Tresmondi ; Anselmo Nogueira ; Elza Guimarães…
• 关键词：Apical meristems ; Colleters ; Glands ; Histochemistry ; Microclimate ; Phenology ; Secretion ; Shoot apex
• 刊名：Naturwissenschaften
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：102
• 期：11-12
• 全文大小：2,088 KB
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• 作者单位：Fernanda Tresmondi (1)
  Anselmo Nogueira (2)
  Elza Guimarães (3)
  Silvia Rodrigues Machado (3)
  
  1. Programa de Pós-Graduação em Ciências Biológicas (Botânica), UNESP—Univ Estadual Paulista, Caixa Postal 510, Botucatu, SP, 18618-970, Brazil
  2. Instituto de Biociências, Departamento de Botânica, USP—Universidade de São Paulo, Rua do Matão, 277, São Paulo, SP, 05508-090, Brazil
  3. Instituto de Biociências, Departamento de Botânica, UNESP, Univ Estadual Paulista, CP 510, Botucatu, SP, 18618-970, Brazil
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Life Sciences
  Environment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1904

文摘

Colleters are secretory structures that produce and release mucilage or a mucilage-resin mixture protecting meristems and young structures against desiccation, herbivores, and pathogens. The secretions may vary in colleters of same or different types, indicating that the functionality of colleters may be more specific than previously thought. In this study, we compared 17 Rubiaceae species from savanna and forest environment focusing on colleter secretions and its ecological role. First, we evaluated the morphology, distribution, and histochemistry of stipular colleters using light and scanning electron microscopy. Additionally, we investigated the phenology, microclimate, and the proportion of damaged apices in the savanna and forest species. We recorded standard-type colleters, variable in distribution and size, in 14 of the 17 studied species. The secretion varied from predominantly hydrophilic, mixed to predominantly lipophilic. During the budding period, secretion covered the vegetative apices. Savanna species had a prevalence of lipid secretion in habitats with higher luminosity, which had a lower proportion of damaged apices. In contrast, forest species occurred in habitats with lower luminosity and had a higher proportion of damaged apices, in general with the absence of lipids in the colleters. These results highlight that colleters with similar morphology clearly differed in secretions among species, especially between species from savanna and forest, in which the colleters appear potentially associated with protection against irradiation in savanna, but not in the forest environment.