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Ontogeny of reproductive units and replum formation in Pyrostegia venusta (Ker Gawl.) Miers (Bignoniaceae)

Grant number: 12/13736-2
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2012
Effective date (End): August 31, 2013
Field of knowledge:Biological Sciences - Botany
Principal Investigator:Sandra Maria Carmello-Guerreiro
Grantee:Rafael Siqueira de Andrade
Home Institution: Instituto de Biologia (IB). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The family Bignoniaceae Juss. includes about 800 species of arboreal habits, shrubs and vines. Its distribution is pantropical with highest occurrence in the Neotropics. Brazil has a significant representation in the diversity of the family, with about 350 species. The current classification of the family allows a separation into eight tribes, and one of the characters that allows such a distinction possible is the type of fruit. Thus, the formation of fruit has a great relevance to understanding the taxonomy of the group. The studies conducted so far in Bignoniaceae still don't eliminate the doubts about the development of the ovary, placenta formation, the septum and/or replum, and the formation of the fruit. There are few studies that verify these morphological and anatomic characters. In this context, the focus of this project, is therefore, to study the development of the reproductive units of Pyrostegia venusta (Ker Gawl.) Miers, which belongs to the tribe Bignonieae Dumort. It is a species that occurs in fields, forest borders and roadsides, and may even be a culture invader. The work, thus, search for information about the formation of the placenta and of the septum or replum, and with this contribute to the taxonomy of the group.