Key message Pollen biology in P. aphrodite. Abstract Orchids have a distinct reproductive
program. Pollination triggers ovule development and differentiation within flowers, and …

A origem dos embriões supranumerários e a embriogenia de Tabebuia ochracea foram
analisadas. Embriões supranumerários apomíticos têm origem adventícia a partir de células …

Ovule and seed development in plants has long fascinated the scientific community given
the complex cell coordination implicated in these processes. These cell events are highly …

Neopolyploidy has been associated with gametophytic apomixis and breakdown of
gametophytic self-incompatibility. Nevertheless, Bignoniaceae presents agamic polyploid …

Premise of research. Recent phylogenetic studies placed nearly all Neotropical arboreal
and shrubby species of the Bignoniaceae (excluding Jacaranda) in the Tabebuia alliance, a …

O presente trabalho descreveu a ontogenia da semente de T. ochracea através de análises
histológicas com especial referência a endospermogênese. Os óvulos são anátropos …

This paper presents a contribution to the understanding of the embryology, especially
microsporogenesis, the antipodal cell behavior, and the early stages of the micropylar seed …

The chalazal megaspore develops in a Polygonum-type embryo sac. The amyloplast-rich
endothelium is partially degraded during the expansion of the micropylar portion of the …

Reproductive organs, in flowering plants, are sensitive to stressful environments. Alhagi
persarum Boiss. & Buhse copes with the stresses and produce reproductive organs under …

Na maioria das Angiospermas poucas flores produzem frutos e sementes (Lloyd, 1980;
Stephenson, 1981; Bawa & Webb, 1984). A regulação desta taxa é feita através do aborto …