The oleoresin secretory system in seedlings and adult plants of copaíba (Copaifera langsdorffii Desf., Leguminosae–Caesalpinioideae)

Oil Glands in Pterodon pubescens Benth. (Leguminosae-Papilionoideae): Distribution, Structure, and Secretion Mechanisms

“…This species is epigeous-phanerocotyledonar, and the presence of secretory cavities helps to protect the exposed young and vulnerable parts. The protective function of the secretory cavities begins in the seedling stage, a critical period of plant development, as reported by Rodrigues et al (2011b) for Copaifera langsdorffii seedlings. As mentioned above, secretory cavities are lacking in the mature embryo.…”

“…Some images, such as multivesicular bodies and paramural bodies in the epithelial cells, are evidence of granulocrine secretion (Nair et al 1983;Venkaiah 1992;Carmello et al 1995). Finally, the disruption of the dark epithelial cells followed by the release of their contents into the lumen cavity characterizes a holocrine secretion process (Fahn 1979), which in this species is associated with programmed cell death, as reported by Rodrigues et al (2011b). To our knowledge, the involvement of holocrine as well as eccrine and granulocrine processes in the same secretory system is not common.…”

“…These cells have been suggested to have (Solereder 1908;Turner 1986;Teixeira et al 2000;Teixeira and Rocha 2009). The ultrastructural features observed in the epithelial cells of P. pubescens, such as the proliferation of smooth endoplasmic reticulum and polymorphic plastids, are common characteristics described for oil cells in other species (Paiva and Machado 2007;Teixeira and Rocha 2009;Rodrigues et al 2011b). Proliferation of smooth endoplasmic reticulum and plastids without grana are associated with lipid synthesis (Fahn 1979;2000) and have been described for many glands secreting lipophilic substances, mainly monoterpenes (Cheniclet and Carde 1985;Monteiro et al 1999;Turner et al 1999;Machado et al 2006;Paiva et al 2008).…”

“…Secretory cavities and canals are common in many members of Leguminosae and can occur in vegetative (Lersten and Curtis 1986;Turner 1986;Teixeira et al 2000;Teixeira and Gabrielli 2000;Marcati et al 2001;Paiva and Machado 2007;Rodrigues and Machado 2009;Teixeira and Rocha 2009;Rodrigues et al 2011aRodrigues et al , 2011bMilani et al 2012) or reproductive organs (Paiva et al 2008;Teixeira and Rocha 2009). These structures in legumes have taxonomic (Turner 1986;Lersten and Curtis 1996;Teixeira et al 2000;Gabrielli 2000, 2006), ecological (Langenheim et al 1982;Arrhenius and Langenheim 1983;Langenheim 2003), and economic (Coelho et al 2001;Langenheim 2003;Plowden 2003) aspects.…”

“…Rodrigues et al (2011b) noted that secretory cavities occur also in the stem of P. pubescens, where their lumen is initiated by schizogenesis and epithelial cells undergo programmed cell death in their late developmental stages. According to Rodrigues et al (2011a), dead epithelial cells are replaced by new ones originating from the parenchyma sheath, characterizing an open pattern of development.…”