IBONE   05434
INSTITUTO DE BOTANICA DEL NORDESTE
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Pistillate and staminate flower morphology and anatomy in dioecious Cordiera concolor (Gardenieae- Rubiaceae)
Autor/es:
JUDKEVICH, MARINA D.; GONZALEZ ANA M.
Lugar:
Salvador, Bahía
Reunión:
Conferencia; VI International Rubiaceae & Gentianales Conference; 2014
Resumen:
The structure and anatomy of mature unisexual flowers
of Cordiera concolor (Gardenieae-
Rubiaceae) was investigated using scanning electron and light microscopy in order to determinate the organogenetic patterns in
both unisexual flowers to contribute to the knowledge of the species. The
results show that both types of flowers share: 1) a cupuliform calyx that
externally has simple unicellular trichomes and paracytic stomatas, and
internally, has 2-3 layers of dendroid colleters that secrete resine, 2) a
nectary disc is located around the base of the style and having anomocytic
nectarostomatas, 3) a 4-lobed corolla that externally has simple
unicellular trichomes and paracytic stomatas, and 4) stamen fused to the
corolla for a short staminal filament. The mesophyll in
all floral pieces has cells with tannin and cells with druse. The pistillate flowers have an inferior ovary, bilocular
with 2-10 ovules per locule. The style has two stigmatic branches, ovate and
papillose. The anthers of pistillate flowers possess tetrads surrounded by
callose, these tetrads collapse at maturity. The staminate flowers have an
underdeveloped inferior ovary with two reduced locules and absent or rudimentary
ovules, style with two long, spread stigmatic branches. The anthers in
staminate flower produce pollen grains and have longitudinal dehiscence. Therefore,
the flowers in this species are structurally perfect but functionally
pistillate and staminate respectively.