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STRUCTURE AND HISTOCHEMISTRY OF THE FLORAL NECTARY OF Bauhinia monandra (FABACEAE)
Estructura e histoquímica del nectario floral de Bauhinia monandra (Fabaceae)
Estrutura e histoquímica do nectário floral de Bauhinia monandra (Fabaceae)
DOI:
https://doi.org/10.15446/abc.v28n1.88610Palabras clave:
anatomy, flower, Leguminosae, medicinal plant, secretory structure (en)anatomía, estructura secretora, flor, Leguminosae, planta medicinal (es)
anatomia, estrutura secretora, flor, Leguminosae, planta medicinal (pt)
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The structure and histochemistry of the floral nectary of Bauhinia monandra Kurz (Fabaceae) were investigated. Besides possessing medicinal properties, this tree is also used in the recovery of degraded areas and urban arborization. Nectaries samples were obtained from newly bloomed flowers. The nectary was located on the tubular hypanthium. This tube was partially coated by a nectary epidermis, whose cells had secretory features such as a relatively large nucleus, a dense cytoplasm, and small vacuoles. Subjacent to the nectary epidermis, there was a nectary parenchyma with eight to fifteen layers of cells which also have secretory features. Both the nectary epidermis and nectary parenchyma possessed starch grains. Subjacent to the nectary parenchyma passed collateral to amphicribral concentric vascular bundles constituted by more phloem than xylem. Although these vascular bundles did not emit terminations directed to the nectary parenchyma, the arrangement of the latter about the former suggests the supply of nectar precursors by the vascularisation. In the basal region of the hypanthium tube occurred modified stomata which were probably the main route of nectar release; and tector trichomes, possibly involved in the nectar retention.
La estructura e histoquímica del nectario floral de Bauhinia monandra Kurz (Fabaceae) fueron investigadas. Además de poseer propiedades medicinales, este árbol también se utiliza en la recuperación de áreas degradadas y en la arborización urbana. Se obtuvieron muestras de nectarios de flores recién abiertas. El nectario se ubicó en el hipanto tubular. Este tubo estaba parcialmente cubierto por una epidermis nectarífera, cuyas células tenían características secretoras, como un núcleo relativamente grande, un citoplasma denso y pequeñas vacuolas. Subyacente a la epidermis nectarífera, había un parénquima nectarífero con ocho a quince capas de células que también tenían características secretoras. Tanto la epidermis nectarífera como el parénquima nectarífero contenían granos de almidón. Subyacente al parénquima nectarífero había haces vasculares colaterales o concéntricos anficribrales constituidos por más floema que xilema. Aunque estos haces vasculares no emitieron terminaciones dirigidas al parénquima nectarífero, la disposición de este último en relación con los primeros sugiere el suministro de precursores de néctar por la vascularización. En la región basal del tubo de hipanto había estomas modificados que probablemente eran la ruta principal de liberación de néctar; y tricomas tectores, posiblemente activos en la retención de néctar.
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