|
|
|
|
|
| Salomão,Antonieta N.; Allem,Antonio C.. |
| The occurrence of polyembryony was investigated in 75 woody species of the Cerrado in central Brazil and the xerophilous Caatinga vegetation in northeastern Brazil. Fourteen species showed polyembryony, a type of anomalous angiospermous reproduction. Polyembryony is reported for the first time for nine genera, Astronium, Byrsonima, Cariniana, Copaifera, Hancornia, Magonia, Myracrodruon, Tabebuia, and Tapirira. The positive correlation found between polyembryony, sexual reproduction, and apomictic processes suggests that a number of angiospermous species may make regular use of multiple breeding systems. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Angiosperms; Agamospermy; Apomixis; Polyembryony; Brazilian neotropics. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062001000300007 |
| |
|
|
| Silva,Celice Alexandre; Oliva,Marco Antonio; Vieira,Milene Faria; Fernandes,Geraldo Wilson. |
| Trioecy, the co-occurrence of the males, females, and hermaphrodite morphs in natural populations, is a rare and poorly studied breeding system. It is expressed in Coccoloba cereifera, an endemic, and endangered species from the rupestrian fields of Serra do Cipó, southeastern Brazil. Male individuals produce staminate flowers but no fruits. Female individuals produce pistillate flowers and set fruits. Both staminate and pistillate flowers present non-functional organs of the opposite sex that simulate perfect flowers. Hermaphrodite individuals produce two different perfect flowers, each one belonging to distinct individuals, and set fruits. Perfect flowers differ in the amount of pollen produced, in pollen viability, and in some morphological traits. Two... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agamospermy; Breeding systems; Coccoloba cereifera; Sex determination; Sexual morphs; Trioecy. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000500017 |
| |
|
|
|
