| Full text | |
| Author(s): |
Tresmondi, Fernanda
[1]
;
Nogueira, Anselmo
[2]
;
Guimaraes, Elza
[3]
;
Machado, Silvia Rodrigues
[3]
Total Authors: 4
|
| Affiliation: | [1] Univ Estadual Paulista, UNESP, Programa Posgrad Ciencias Biol Bot, BR-18618970 Botucatu, SP - Brazil
[2] Univ Sao Paulo, Inst Biociencias, Dept Bot, BR-05508090 Sao Paulo, SP - Brazil
[3] Univ Estadual Paulista, UNESP, Inst Biociencias, Dept Bot, BR-18618970 Botucatu, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | NATURWISSENSCHAFTEN; v. 102, n. 11-12 DEC 2015. |
| Web of Science Citations: | 4 |
| Abstract | |
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. (AU) | |
| FAPESP's process: | 11/02488-5 - Biology of foliar colleters in Rubiaceae cerrado and semideciduous forest in the state of São Paulo |
| Grantee: | Fernanda Tresmondi |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 08/55434-7 - Secretory structures in plant species from cerrado: structural, chemical and ecological approaches |
| Grantee: | Silvia Rodrigues Machado |
| Support Opportunities: | BIOTA-FAPESP Program - Thematic Grants |