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Provedor de dados:  BABT
País:  Brazil
Título:  Trioecy in Coccoloba cereifera Schwacke (Polygonaceae), a narrow endemic and threatened tropical species
Autores:  Silva,Celice Alexandre
Oliva,Marco Antonio
Vieira,Milene Faria
Fernandes,Geraldo Wilson
Data:  2008-10-01
Ano:  2008
Palavras-chave:  Agamospermy
Breeding systems
Coccoloba cereifera
Sex determination
Sexual morphs
Resumo:  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 Hymenoptera species visited the flowers sporadically. The low natural fructification indicated a limited pollination, while the fruit set recorded in bagged pistillate flowers indicated agamospermy. Female individuals represent more than 40% of the population studied and must be the result of agamospermic seeds.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Instituto de Tecnologia do Paraná - Tecpar
Relação:  10.1590/S1516-89132008000500017
Formato:  text/html
Fonte:  Brazilian Archives of Biology and Technology v.51 n.5 2008
Direitos:  info:eu-repo/semantics/openAccess

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