Ultrastructural changes of the egg apparatus associated with fertilisation of natural tetraploid Trifolium pratense L. (Fabaceae)
Biol. Res
;
42(1): 25-30, 2009. ilus
Artigo
em Inglês
| LILACS
| ID: lil-519081
ABSTRACT
The aim of this study is to describe the ultrastructural changes of the egg apparatus associated with fertilisation of the natural tetraploid Trifolium pratense. The pollen tube enters one of the synergids through the filliform apparatus from the micropyle. Before the entry of the pollen tube into the embryo sac, one of the synergids begins to degenerate, as indicated by increased electron density and a loss of volume. This cell serves as the site of entry for the pollen tube. Following fertilization, the vacuolar organisation in the zygote changes; in addition to the large micropylar vacuole, there are several small vacuoles of varying size. Ribosomal concentration increases significantly after fertilisation. In T. pratense, ultrastructural changes between the egg cell and zygote stages are noticeable. Several marked changes occur in the egg cell because of fertilisation. The zygote cell contains ribosomes has many mitochondria, plastids, lipids, vacuoles. After fertilization, most of the food reserves are located in the integument in the form of starch. The zygote shows ultrastructural changes when compared to the egg cell and appears to be metabolically active.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Óvulo
/
Pólen
/
Trifolium
Tipo de estudo:
Fatores de risco
Idioma:
Inglês
Revista:
Biol. Res
Assunto da revista:
Biologia
Ano de publicação:
2009
Tipo de documento:
Artigo
País de afiliação:
Turquia
Instituição/País de afiliação:
Ankara University/TR
Similares
MEDLINE
...
LILACS
LIS