| Full text | |
| Author(s): |
Total Authors: 2
|
| Affiliation: | [1] Universidade Estadual da Paraíba. Departamento de Biologia. Centro de Ciências Biológicas e da Saúde - Brasil
[2] Universidade Estadual de Campinas. Departamento de Botânica - Brasil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Acta Botanica Brasilica; v. 23, n. 2, p. 376-388, 2009-06-00. |
| Abstract | |
The study assessed phloem canal development and ultra-structure in shoot apices of Spondias dulcis G. Forst., phloematic canal ultra-structure in shoot apices of Tapirira guianensis Aubl., and floral canal ultra-structure and development and fruit canal ultra-structure of the latter specie. The flower and fruit canals of Anacardium humile St.Hil. were also studied ultra-structurally. The canals in shoot apices of S. dulcis show schizo-lysigenous formation and the floral canals of T. guianensis show schizogenous development. Epithelial cells of S. dulcis and T. guianensis canals have rough endoplasmic reticulum, free ribosomes, elongated plastids of several shapes with osmiophilic inclusions and dictyosomes with production of vesicles. Such organelles participate in the secretion of a heterogeneous exudate, which is comprised of hydrophilic and lipophilic substances. The epithelial cells of the fruit of A. humile present elongated plastids with circular membrane system, which are involved in the synthesis of lipophilic substances. The results of the ultra-structural analyses of the epithelial cells corroborate the results previously obtained in a histochemical study. In the histochemical study, lipophilic and hydrophilic substances were identified in the canals of T. guinanensis and S. dulcis and only lipophilic substances were identified in the canals of A. humile. Based on the ultrastructural aspects of the secretory canals of T. guianensis and S. dulcis we concluded that the plastids of the epithelial cells of the two species are different although they produce secretion of similar composition. A new record for the family is the presence of a great number of circular plastids in epithelial cells of the fruit of Anacardium humile. The pattern found in the secretory canals of the studied species is the ecrine type of secretion release. (AU) | |
| FAPESP's process: | 00/12469-3 - Morphological, anatomical, histochemical, and ultrastructural studies of cerrado plants (sensu lato) of São Paulo State |
| Grantee: | Silvia Rodrigues Machado |
| Support Opportunities: | BIOTA-FAPESP Program - Thematic Grants |
| FAPESP's process: | 03/13556-5 - Secretory structure in vegetative and reproductive organs of species of Anacardiaceae in the Cerrado of the State of São Paulo: anatomy, histochemistry and ultrastructure |
| Grantee: | Ana Paula Stechhahn Lacchia |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |