INMIBO ( EX - PROPLAME)   14614
INSTITUTO DE MICOLOGIA Y BOTANICA
Unidad Ejecutora - UE
artículos
Título:
Development and differentiation of the extrafloral nectaries from flower buds in Vigna luteola (Leguminosae, Phaseolinae).
Autor/es:
GALATI, B.G.; OJEDA, F. S. ; AMELA GARCÍA, M. T.
Revista:
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS.
Editorial:
ACAD BRASILEIRA DE CIENCIAS
Referencias:
Lugar: Rio de Janeiro; Año: 2020 vol. 92
ISSN:
0001-3765
Resumen:
To study the ontogeny of theExtrafloral nectaries present in the inflorescences of Vigna luteola (Jacq.)Benth (Leguminosae, Phaseolinae), the location, morphology, anatomy of theearliest stages, histology of the definitive structures and ultrastructure ofthe secretory stage were analyzed. The Extrafloral nectaries at differentdevelopmental stages were examined with light microscopy and scanning electronmicroscopy. The secretory stage was also examined with transmission electronmicroscopy. The racemose inflorescence of V. luteola has six nodes. Ateach node, a short globose secondary axis bears two flowers and one--threeExtrafloral nectaries. Each Extrafloral nectaries originates from theabscission of a flower bud and are formed by two differentiated zones: a ringof epidermal cells surrounding a group of longitudinally enlarged papillosecentral cells, both with underlying secretory parenchyma. The primary secretorytissue consists of the central cells, while the ring contributes to secretionto a lesser degree. Secretion is granulocrine, by means of exocitotic vesiclesand plasmalemma invaginations. Four developmental stages succeed; the third onebeing the secretory. The Extrafloral nectaries activity period starts when theflowers of the same secondary axis open and ceases before fruit development.