Morphology, ultrastruture and pollen germination in Ibicella lutea (Martyniaceae).

PASSARELLI, LILIÁN; GONZÁLEZ, GRACIELA ESTHER

GRANA

TAYLOR & FRANCIS AS

Lugar: Londres; Año: 2020

0017-3134

Pollenmorphology, ultrastructure and germination mode of Ibicella lutea was investigated and documented using light microscopy (LM) scanning electron microscopy(SEM) and transmission electron microscope (TEM). Ibicella pollen is clypeate, spheroidal,apolar, inaperturate, insulated, large, with an average diameter of 80 μm. The outer wall is formed in the insula by twodistinct layers, the exine, semitectate, with ectexine constituted bycolumella, tectum and foot layer and a granulated endexine, being the onlylayer in the area between the insula. The vegetative nucleus has irregular shapeand the generative nucleus is spheroidal. This is the first report of thepresence of micro bodies within the vegetative cell of the family Martyniaceae.The probable function of the microbodies in the lipid metabolism of thevegetative cell is discussed. The pollen tube emerges in the thinner areas ofthe wall that surround the islands, near of these areas of the wall vacuolesand secretory vesicles produced by dictyosomes are observed.