Androecium development of Oxypetalum appendiculatum Mart. (Apocynaceae): A Taxonomic Approach

Autores

  • F. A. Z. Vital Universidade Federal de Lavras
  • A. T. Nakamura Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Campus Monte Carmelo, Rodovia LMG 746, Km 01, s/nº, CEP 38.500-000, Monte Carmelo-MG, Brasil.

DOI:

https://doi.org/10.36560/1152018739

Palavras-chave:

Anther, Endothecium, Microsporogenesis, “MOOG Clade”, Subsessile Filament

Resumo

Circa 80% of the neotropical species of Asclepiadoideae (Apocynaceae) belong to the “MOOG Cladeâ€, whose interrelations are poorly established. This study describes the floral morphology, anther development, microsporogenesis, microgametogenesis, and pollinarium and pollen grain morphology of Oxypetalum appendiculatum to foster future taxonomic work. In addition to typical morphological features of Asclepiadoideae, as a bifid vinaceous appendix and a translator with a laterally expanded retinaculum, flowers present a clear division of stamens into three groups, with respect to size and arrangement in the flower, which has not yet been reported in the literature. Stamens present connate, subsessile filaments, bisporangiate anthers with six parietal layers, and dicotyledonous development. Endothecium is unthickened; secretory tapetum is biseriate on the adaxial side and multiseriate on the abaxial surface. Successive microsporogenesis produces linear tetrads. Single pollen grains, united in pollinia, are tricellular and inaperturate. Features as bisporangiate anthers and successive microsporogenesis delimit the subfamily. Unthickened endothecium may indicate a derived position of O. appendiculatum in the “MOOG Cladeâ€.

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Publicado

2018-10-02

Como Citar

Vital, F. A. Z., & Nakamura, A. T. (2018). Androecium development of Oxypetalum appendiculatum Mart. (Apocynaceae): A Taxonomic Approach. Scientific Electronic Archives, 11(5), 130–139. https://doi.org/10.36560/1152018739

Edição

v. 11 n. 5 (2018): Scientific Electronic Archives

Seção

Ciências Biológicas

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