Características morfológicas dos grãos de pólen e mecanismos florais de polinização em Papilionoideae e Caesalpinoideae -Cassiinae (Leguminosae)

• Ano de defesa: 2020
• Autor(a) principal: BARROS, Monara da Mota Fonseca do Rêgo
• Orientador(a): LEITE, Ana Virgínia de Lima
• Banca de defesa: ALMEIDA, Natan Messias de, CASTRO, Cibele Cardoso de, NADIA, Tarcila Correia de Lima
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal Rural de Pernambuco
• Programa de Pós-Graduação: Programa de Pós-Graduação em Botânica
• Departamento: Departamento de Biologia
• País: Brasil
• Palavras-chave em Português: Palinologia; Fabaceae; Polinização; Melitofilia; Morfologia; Leguminosae; Flores
• Área do conhecimento CNPq: CIENCIAS BIOLOGICAS::BOTANICA
• Link de acesso: http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/8800

The floral evolution in Leguminosae selected pollinators, making them more specialized. The highest expression of this occurs in Papilionoideae, with four pollen release mechanisms: piston, brush, valve and explosive. Considering that there are different strategies for pollen release among Leguminosae species, we hypothesize that there is a difference between the morphological characteristics of the pollen grains and the different floral mechanisms in the species of Papilionoideae and Caesalpinioideae s.l. poricides. To test the hypothesis, a database was built with information on the pollens of 121 species of Leguminosae pollinated by bees and with different presentation mechanisms, collected from published literature and material available in the Pollen Catalog Network. Statistical analyzes of variance were used to establish a relationship between the categories. From this, a significant relationship was noticed between: exine ornamentation and release strategies; Pollen/Exine (P/E) ratio, general average and general average diameter of the polar axis of the pollen grains, and the different pollen release strategies. It is concluded that, due to both diversity and the complex set of reproductive strategies, the evolution of Leguminosae systems has been building a strong relationship between pollen morphology and the mechanisms of pollen grains release.