Anther wall and pollen development in Neotropical species-rich Miconia (Melastomataceae)

Autor(es)

Cortez, Priscila Andressa ^{[1, 2]} ; Souza Caetano, Ana Paula ^{[3, 2]} ; Carmello-Guerreiro, Sandra Maria ^[3] ; Teixeira, Simone Padua ^[4]

Afiliação do(s) autor(es)

^[1] Univ Estadual Santa Cruz, Dept Ciencias Biol, BR-45662900 Ilheus, BA - Brazil

^[2] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, Programa Posgrad Biol Vegetal, BR-13083970 Campinas, SP - Brazil

^[3] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, BR-13083970 Campinas, SP - Brazil

^[4] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Dept Ciencias Farmaceut, BR-14040903 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLANT SYSTEMATICS AND EVOLUTION; v. 301, n. 1, p. 217-230, JAN 2015.
• Citações Web of Science: 1

Resumo

Miconia is one of the largest exclusively Neotropical genera, inserted in the tribe Miconieae. Although the monophyly of the tribe has recently been recognized, the delimitation of its genera is considered quite arbitrarily defined, mainly due to the great diversity combined with little morphological and genetic characterization of its members. Recent findings have associated this diversity with polyploidy, apomixis and hybridization, mechanisms commonly found in the group. The conventional delimitation of sections in Miconia, which has been largely based on stamen morphology, has proved to be undoubtedly artificial; nevertheless, the potential taxonomic significance of anther wall and pollen ontogenetic characters within the genera Miconia has been little explored. Hence, this study intended to fill that gap in our knowledge, by investigating the anther wall and pollen development in six closely related species of Miconia: M. albicans, M. fallax, M. latecrenata, M. paucidens, M. pepericarpa and M. stenostachya. Routine techniques for both light and electronic microscopy were used to examine anthers and pollen grains in several developmental stages. The species studied here share several character states, such as the remarkable monocotyledonous anther wall development, the persistent endothecium in the mature anthers with no cell wall thickenings, the bilocular dehiscent anther and the psilate pollen exine. This study also reports for the first time bisporangiate anthers, crystals and proteinoplasts in tapetal cells for Melastomataceae, and ultrastructural features of anther and pollen wall for Miconia. (AU)

• Processo FAPESP: 07/52030-0 - Desenvolvimento dos estratos parietais da antera e dos andrófitos em espécies de Miconia (Melastomataceae) com diferentes sistemas reprodutivos
• Beneficiário: Priscila Andressa Cortez
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 08/10793-0 - Embriologia em espécies de Miconia (Melastomataceae) com diferentes sistemas reprodutivos
• Beneficiário: Sandra Maria Carmello-Guerreiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/15077-0 - Apomixia, sexualidade, poliploidia e viabilidade polínica na tribo Neotropical Miconieae (Melastomataceae)
• Beneficiário: Ana Paula de Souza Caetano
• Modalidade de apoio: Bolsas no Brasil - Doutorado