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| Author(s): |
Herika Aparecida Bequis de Araujo Zaia
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2004-05-28 |
| Examining board members: |
Marcelo Carnier Dornelas;
Claudio José Barbedo;
Tamara Canto Fonseca
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| Advisor: | Marcelo Carnier Dornelas |
| Abstract | |
The study of the floral ontogeny is essential for the understanding the evolutionary processes involved in the development of the floral organs. The aim of this work was to analyse the floral ontogeny the species C. echinata, C. peltophoroides and C. ferrea, from the family Fabaceae/ Caesalpinioideae. Scanning electron microscopy and light microscopy techniques were used. The observed results indicated that the ontogeny events of the tree species were similar: the inflorescence apical meristem is indeterminate and initiates bracts in an acropetal order. Each bract protects a single floral meristem. The first floral organ formed is the abaxial sepal and it is followed by the lateral and adaxial sepal primordia in a unidirecional order. The whorls of petal and antepetalous and antesepalous stamen primordial are the next to begin. The carpel primordium arise as a mound in the center of the floral meristem. When the carpel primordium is about 100µm high, a cleft is formed in its adaxial side, on the site where the placenta will be formed. At anthesis, the stigma differentiates papilate cells. The results obtained with this descriptive work will serve as a foundation for future studies of the molecular aspects of reproductive development of legumes. (AU) | |