Floral development and anatomy of pistillate flowers of lophophytum (balanophoraceae), with special reference to the embryo sac inversion
The extreme reduction of flowers in the Balanophoraceae has generated few and incomplete studies with scattered and often contradictory results with respect to embryology. Using light and scanning microscopy, gynoecium, ovule and embryo-sac development are described in two (of 4) species of Lopho ph...
Guardado en:
| Autores principales: | , |
|---|---|
| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
Elsevier
2022
|
| Materias: | |
| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/47975 |
| Aporte de: |
| id |
I48-R184-123456789-47975 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Nacional del Nordeste |
| institution_str |
I-48 |
| repository_str |
R-184 |
| collection |
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) |
| language |
Inglés |
| topic |
Balanophoraceae Embryo-sac Holoparasite Inversion Lophophytum leandri Lophophytum mirabile Ovule |
| spellingShingle |
Balanophoraceae Embryo-sac Holoparasite Inversion Lophophytum leandri Lophophytum mirabile Ovule Sato, Héctor Arnaldo González, Ana María Floral development and anatomy of pistillate flowers of lophophytum (balanophoraceae), with special reference to the embryo sac inversion |
| topic_facet |
Balanophoraceae Embryo-sac Holoparasite Inversion Lophophytum leandri Lophophytum mirabile Ovule |
| description |
The extreme reduction of flowers in the Balanophoraceae has generated few and incomplete studies with scattered and often contradictory results with respect to embryology. Using light and scanning microscopy, gynoecium, ovule and embryo-sac development are described in two (of 4) species of Lopho phytum. The pistillate flower lacks perianth, and it is reduced to one pistil formed by a superior, biloculate ovary and two styles with capitated stigmas. Two ategmic hemianatropous ovules are inserted on the upper portion of a central placental column. The two locules are almost completely obstructed by the ovules. The term micropyle is not applicable in its usual sense, due to the absence of integuments. The term “micropylar pole” instead of micropyle was used to designate the apex of the nucellus, where the megaspore mother cell develops. Vascular supply is missing in the placenta and the ovule, therefore, the chalaza and the funiculus cannot be defined. The point of attachment of the nucellus to the placenta was designated “chalazal pole”. The embryo-sac is Adoxa type. During the migration of the two pairs of nuclei to the opposite poles,the four-nucleate embryo-sac tends to take a “J” shape. Each pair of nuclei undergoes a mitotic division to form an eight-nucleate embryo-sac. In the upper, chalazal pole of the embryo-sac, a typical egg-apparatus with a central egg-cell and two adjacent synergids cells is developed, while in the micropylar pole three antipodes are formed, all that determines an embryo-sac of reversed position. The analysis of the anatomy and development of pistillate flowers and the study of the functional architec ture of ovules, carpels and embryo-sac, provide embryological data of great importance to complement phylogenetic studies in the family Balanophoraceae, and even in order Santalales |
| format |
Artículo |
| author |
Sato, Héctor Arnaldo González, Ana María |
| author_facet |
Sato, Héctor Arnaldo González, Ana María |
| author_sort |
Sato, Héctor Arnaldo |
| title |
Floral development and anatomy of pistillate flowers of lophophytum (balanophoraceae), with special reference to the embryo sac inversion |
| title_short |
Floral development and anatomy of pistillate flowers of lophophytum (balanophoraceae), with special reference to the embryo sac inversion |
| title_full |
Floral development and anatomy of pistillate flowers of lophophytum (balanophoraceae), with special reference to the embryo sac inversion |
| title_fullStr |
Floral development and anatomy of pistillate flowers of lophophytum (balanophoraceae), with special reference to the embryo sac inversion |
| title_full_unstemmed |
Floral development and anatomy of pistillate flowers of lophophytum (balanophoraceae), with special reference to the embryo sac inversion |
| title_sort |
floral development and anatomy of pistillate flowers of lophophytum (balanophoraceae), with special reference to the embryo sac inversion |
| publisher |
Elsevier |
| publishDate |
2022 |
| url |
http://repositorio.unne.edu.ar/handle/123456789/47975 |
| work_keys_str_mv |
AT satohectorarnaldo floraldevelopmentandanatomyofpistillateflowersoflophophytumbalanophoraceaewithspecialreferencetotheembryosacinversion AT gonzalezanamaria floraldevelopmentandanatomyofpistillateflowersoflophophytumbalanophoraceaewithspecialreferencetotheembryosacinversion |
| bdutipo_str |
Repositorios |
| _version_ |
1764820539241660417 |