Ovule ontogeny of Relbunium species in the evolutionary context of Rubiaceae
Karen L. G. De Toni A C and Jorge E. A. Mariath BA Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Diretoria de Pesquisa Científica, Rio de Janeiro, Brasil.
B Universidade Federal do Rio Grande do Sul, Instituto de Biociências, Departamento de Botânica, Porto Alegre, Brasil.
C Corresponding author. Email: karen@jbrj.gov.br
Australian Journal of Botany 58(1) 70-79 https://doi.org/10.1071/BT09134
Submitted: 14 August 2009 Accepted: 17 December 2009 Published: 11 March 2010
Abstract
Carpel and ovule ontogeny, gynosporogenesis and gynogametogenesis in species of Relbunium were studied in order to provide additional data distinguishing evolutionary embryological characters. No significant differences in either ontogeny or morphology were observed among the species. The following characteristics are common to all species studied: (1) an independent development between the establishment of carpels and placenta meristem; (2) a bi-layered structure of the ovule primordia; and (3) a remnant gynosporium of the ovules, which contains the gynospores and binucleated gametophytes that migrate towards the micropyle where their development is concluded. The embryological characters are explored, and additional data are provided for the analyses of the evolutionary tendencies to Relbunium (Endl.) Benth. & Hook. f. species. In accordance with previous evolutionary proposals, the analysed species can be compared with the Galium type.
Acknowledgements
The authors thank Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the grant awarded to the first author and Conselho Nacional de Pesquisas (CNPq) for the grant awarded to the second author, as well as the Laboratório de Anatomia Vegetal/ UFRGS, the Laboratório de Botânica Estrutural/JBRJ and Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), process E-26/112.349/2008 for research support.
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