New perspectives on secretory structures in Clusia (Clusiaceae - Clusiod Glade): production of latex or resins?

Autor(es)

Alencar, Ana Claudia ^[1] ; Tolke, Elisabeth Dantas ^[2] ; Sampaio Mayer, Juliana Lischka ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, Rua Monteiro Lobato 255, Campinas, SP - Brazil

^[2] Univ Sao Paulo, Inst Biociencias, Dept Bot, Rua Matao 277, Cidade Univ, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BOTANY; v. 98, n. 3, p. 161-172, MAR 2020.
• Citações Web of Science: 0

Resumo

The Clusioid Glade is quite diverse, encompassing the five families Clusiaceae, Bonnetiaceae, Calophyllaceae, Hypericaceae, and Podostemaceae. However, its members have important synapomorphies, such as the presence of xanthones, polyisoprenylated benzophenones, and quinones, as well as schizogenous secretory ducts and cavities, and tenuinucellate ovules. Owing to the milky appearance of the exudate present in ducts of these families (except Bonnetiaceae), many authors have referred to this secretion as latex, while others have preferred to use the term resin. Faced with this confusion about the description of the exudate present in Clusiaceae, the aim of this study was to identify which classes of substances are being produced by those structures in the genus Clusia, compared with other members of Clusiaceae and the Clusioid Glade in general. Furthermore, we describe the structure and distribution of the secretory ducts in species of Clusia, as well as a detailed histochemical study. These secretory ducts secrete an exudate of variable composition, but predominantly terpenic. We conclude that Clusia, as well as some representatives of the Clusioid Glade, do not have latex but resiniferous secretory ducts. (AU)

• Processo FAPESP: 12/51781-0 - Estudos taxonômicos, filogenéticos, genômicos e ecobiogeográficos no Clado clusioide, com ênfase nos gêneros Caraipa, Haploclathra, Kielmeyera e Clusia
• Beneficiário: Maria do Carmo Estanislau do Amaral
• Modalidade de apoio: Auxílio à Pesquisa - Regular