COLLETERS ON THE INFLORESCENCE AXIS OF CROTON GLANDULOSUS (EUPHORBIACEAE): STRUCTURAL AND FUNCTIONAL CHARACTERIZATION

Autor(es)

Machado, Silvia R. ^[1] ; Paleari, Lucia M. ^[2] ; Paiva, Elder A. S. ^[3] ; Rodrigues, Tatiane M. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista. Inst Biociencias Botucatu

^[2] Univ Estadual Paulista. Inst Biociencias Botucatu

^[3] Univ Fed Minas Gerais. Inst Ciencias Biol

^[4] Univ Estadual Paulista. Inst Biociencias Botucatu

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF PLANT SCIENCES; v. 176, n. 1, p. 86-93, JAN 2015.
• Citações Web of Science: 0

Resumo

Premise of research. Croton glandulosus L. is a ruderal annual species of Euphorbiaceae native to the American tropics and widespread in urban and rural areas in Brazil. We investigated the structure, histochemistry, and ultrastructure of glands on the inflorescence axis of C. glandulosus to explore the relationship between their structure and function. Methodology. Reproductive apexes were prepared according to standard methods for plant anatomy, SEM., and TEM. Histochemical tests were performed using fresh material. Pivotal results. Mature glands are bowling pin shaped and are differentiated into a single-layered secretory epidermis arranged radially around a parenchymatous central axis supplied with xylem. In the neck region of the glands, the epidermal cells present structural components typical of lipophilic secretion, whereas the parenchyma cells are specialized in the production of hydrophilic compounds. The resinous secretion is released by cuticle pores occurring exclusively on the tip of the gland. Conclusions, This is the first report of the occurrence of colleters on the inflorescences of a Croton species. Our observations clearly indicate that glands on the inflorescence axis of C. glandulosus are resin-secreting colleters that may have important protective functions. (AU)

• Processo FAPESP: 08/55434-7 - Estruturas secretoras em espécies vegetais de cerrado: abordagens morfológica, química e ecológica
• Beneficiário: Silvia Rodrigues Machado
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 08/52134-2 - Papel das estruturas glandulares de Croton glandulosus (Euphorbiaceae) na interação tritrófica: plantas, predadoras de sementes pré-dispersão e respectivos parasitoides: uma proposta de estudo interdisciplinar, produção de material didático e divulgação científica
• Beneficiário: Silvia Rodrigues Machado
• Modalidade de apoio: Auxílio à Pesquisa - Regular