Two Origins, Two Functions: The Discovery of Distinct Secretory Ducts Formed during the Primary and Secondary Growth in Kielmeyera

Autor(es)

Costa, Ellenhise R. ^[1] ; Tangerina, Marcelo M. P. ^[1] ; Ferreira, Marcelo J. P. ^[1] ; Demarco, Diego ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Biociencias, Dept Bot, BR-05508090 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLANTS-BASEL; v. 10, n. 5 MAY 2021.
• Citações Web of Science: 0

Resumo

Secretory ducts have been reported for more than 50 families of vascular plants among primary and secondary tissues. A priori, all ducts of a plant are of the same type, and only slight variations in the concentration of their compounds have been reported for few species. However, two types of secretion were observed in primary and secondary tissues of Kielmeyera appariciana, leading us to investigate the possible influence of duct origins on the structure and metabolism of this gland. Kielmeyera appariciana has primary ducts in the cortex and pith and secondary ducts in the phloem. Both ducts are composed of uniseriate epithelium surrounded by a sheath and a lumen formed by a schizogenous process. Despite their similar structure and formation, the primary ducts produce resin, while the secondary ducts produce gum. This is the first report of two types of ducts in the same plant. The distinct origin of the ducts might be related to the metabolic alteration, which likely led to suppression of the biosynthetic pathway of terpenoids and phenolics in the secondary ducts. The functional and evolutionary implications of this innovation are discussed in our study and may be related to the diversification of Kielmeyera and Calophyllaceae in tropical environments. (AU)

• Processo FAPESP: 17/23882-0 - Laticíferos articulados e não articulados: estrutura, desenvolvimento e evolução
• Beneficiário: Diego Demarco
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/21593-2 - Baccharis L. (Asteraceae) e fungos endofíticos associados: metabólitos secundários e atividades biológicas
• Beneficiário: Marcelo José Pena Ferreira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/15085-2 - Desenvolvimento, atividade secretora e composição química da resina dos ductos de Kielmeyera appariciana Saddi (Calophyllaceae)
• Beneficiário: Ellenhise Ribeiro Costa
• Modalidade de apoio: Bolsas no Brasil - Mestrado