Biology of secretory cell in rosales species

Abstract

Secretory structures are responsible for the production, isolation and / or release of secondary metabolites in plants. They can occur as individualized cells or multicellular structures of different types and functions, recorded in almost all parts of the plant body. They exhibit great morphological and chemical diversity, and important roles in the interaction of the plant with the elements of its environment. In the order Rosales, which comprises about 8,000 species classified in nine families, the great diversity of types, the wide taxonomic distribution and the wide occurrence of secretory structures in the body of the plants indicated changes in anatomical, taxonomic and functional paradigms. Data on the diversity of forms and distribution of secretory structures in Rosales flowers were obtained from two previous research projects that characterized the floral development of species of the Urticoid clade (Cannabaceae, Moraceae, Ulmaceae, Urticaceae) (AP Fapesp 2014/ 07453-3) and the floral secretory structures of Rosales species (AP Fapesp 2018/03691-8). Thus, with the objective of characterizing forms and processes that act in the diversification of secretory structures in plants, this project includes a team of multidisciplinary researchers to understand, in detail, the biology of the secretory cell, from its differentiation to the secretion process, using species of the order Rosales as study models. 20 species from six families (Cannabaceae, Moraceae, Ulmaceae, Urticaceae, Elaeagnaceae, Rhamnaceae) of Rosales were selected based on our previous studies. Mucilage cell, lactifer system, secretory trichome and emergence will be studied in detail. To this end, leaf, stem and floral organ samples at various developmental stages will be collected and processed for analyses of surface, histological, chemical, substance histolocalization, 3D structure, high resolution X-ray computed tomography and ultrastructural cytochemistry. It is expected: (1) to characterize the microscopic diversity of forms and processes involved in secretory cell differentiation and secretion dynamics; (2) train qualified human resources to work in research in the area; (3) reinforce the line of research of the proponent and associated researchers; (4) disseminate the data obtained in publications of international circulation. (AU)