Anatomia, dos nectános de algumas espécies da flora apícola

Santos, Clovis Ferraz de Oliveira

doi:10.1590/s0071-12761959000100006

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“…Despite the representativeness of Malvaceae in tropical ecosystems, the secretory structure and activity of EFNs have been investigated in only a few members of this family, involving some species of the Abutilon (Findlay & Mercer 1971a, b, Reed et al 1971, Gunning & Hughes 1976, Gossypium (Tyler 1908, Reed 1917, Wergin et al 1975, Eleftheriou & Hall 1983 and Hibiscus, especially H. rosa-sinensis L. (Santos 1959, Sawidis et al 1987a, b, 1989, Sawidis 1991, 1998. Indeed, for some time, the greater part of anatomical and ultrastructural studies on Malvaceae EFNs reports on the secretory trichomes or subglandular tissue, as separate components of the nectary.…”

Section: Introductionmentioning

confidence: 99%

Anatomy, ultrastructure and secretion of Hibiscus pernambucensis Arruda (Malvaceae) extrafloral nectary

Rocha¹,

Machado²

2009

Rev. bras. Bot.

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-(Anatomy, ultrastructure and secretion of Hibiscus pernambucensis Arruda (Malvaceae) extrafl oral nectary). This paper reports on the extrafl oral nectary (EFN) of Hibiscus pernambucensis, a native shrub species occurring in mangrove and restinga along Brazil's coastline. EFNs occur as furrows with a protuberant border on the abaxial surface veins of the leaf blade. Each nectary consists of numerous secretory multicellular trichomes, epidermal cells in palisade-like arrangements and non-vascularized parenchyma tissue. Nectar secretion is prolonged, since secretion starts in very young leaves and remains up to completely expanded leaves. Reduced sugars, lipids, and proteins were histochemically detected in all the nectary cells; phenolic substances were detected in the vacuoles of the epidermal palisade cells and in some secretory trichome cells. The secretory cells that constitute the body of trichomes have large nuclei, dense cytoplasm with numerous mitochondria, dictyosomes, scattered lipid droplets and plastids with different inclusions: protein, lipid droplets or starch grains; vacuoles with different sizes have membranous material, phenolic and lipophilic substances. The palisade cells show thick periclinal walls, reduced cytoplasm with voluminous lipid drops and developed vacuoles. The nectary parenchyma cells contain abundant plasmodesmata and cytoplasm with scattered lipid droplets, mitochondria, plastids with starch grains and endoplasmic reticulum. Mucilage idioblasts are common in the inner nectary parenchyma. Protoderm and ground meristem participate in the formation of EFN. Our data indicate that all nectary regions are involved in nectar production and secretion, constituting a functional unit. Longevity of the extrafl oral nectaries is likely associated with the presence of mucilage idioblasts, which increases the capacity of the nectary parenchyma to store water.Key words -anatomy, extrafl oral nectary, Hibiscus pernambucensis, histochemistry, ultrastructure RESUMO -(Anatomia, ultra-estrutura e secreção do nectário extrafl oral de Hibiscus pernambucensis Arruda (Malvaceae)). Este trabalho descreve o nectário extrafl oral (NEF) de Hibiscus pernambucensis, uma espécie nativa encontrada ao longo do litoral brasileiro, vegetando áreas de manguezal e restinga. NEFs ocorrem como sulcos profundos com bordo saliente sobre as nervuras na face abaxial da lâmina foliar. Cada nectário consiste de numerosos tricomas secretores multicelulares, células epidérmicas dispostas em paliçada e parênquima não vascularizado. Açúcares redutores, lipídeos e proteínas foram histoquimicamente detectados em todas as células do nectário. Compostos fenólicos ocorrem nos vacúolos das células epidérmicas e na porção bisseriada dos tricomas secretores. As células que formam o corpo dos tricomas secretores apresentam núcleo volumoso, citoplasma denso com muitas mitocôndrias, dictiossomos, gotas lipídicas esparsas e plastídios com diferentes tipos de inclusões: proteínas, gotas de óleo ou grãos de amido; os vacúolos poss...

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Section: Introductionmentioning

confidence: 99%

Anatomy, ultrastructure and secretion of Hibiscus pernambucensis Arruda (Malvaceae) extrafloral nectary

Rocha¹,

Machado²

2009

Rev. bras. Bot.

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“…In this family, EFNs occur in the form of striations, chambers or depressions coated with multicellular secretory trichomes (SAWIDIS et al, 1987a, b;1989;SAWIDIS, 1991;1998;VOGEL, 2000). Regardless the fact that species of the Malvaceae are well represented in tropical ecosystems, the secretory structures and activity of EFNs have been studied in only a few species HALL, 1983;MERCER, 1971a, b;SANTOS, 1959;SAWIDIS et al, 1987a, b;SAWIDIS, 1991;1998;REED et al, 1971;REED, 1917;WERGIN et al, 1975). The species studied here, Heliocarpus appendiculatus and H. donnell-smithii, showed numerous EFNs distributed on the leaf blade and at the base of the leaf, varying in number (AGUIRRE et al, 2013), and similarly to other Malvaceae species these EFNs are very prominent, and form a protuberance with numerous capitate trichomes in the central part (WERGIN et al, 1975;KRONESTEDT et al, 1986;SAWIDIS et al, 1987a, b) these glands are constituted by several cells where the extrafloral nectar secretion occurs (MEIRA et al, 2014).…”

Section: Discussionmentioning

confidence: 99%