Abstract
Floral anatomy and development of Saxofridericia aculeata Körn was studied in a comparative approach to contribute to the understanding of the family. Flowers at different developmental stages were analysed with light and scanning electron microscopy, and the nature of the exudate secreted by the floral trichomes was investigated by histochemical tests. The anatomical characteristics observed in S. aculeata flowers were compared with those from other Rapateaceae species by a cluster analysis (UPGMA). The dendrogram generated reflects the groupings that emerged in phylogenetic molecular analyses, highlighting the usefulness of floral anatomy for taxonomy and for the understanding of infrafamilial relationships. The exudate secreted by the trichomes has a polysaccharidic composition. Such trichomes (colleters) occur in the sepals, petals, filaments and around the gynoecium; they are initiated at mid-stage of floral development and are an apomorphy of the family. The flowers are pentacyclic, presenting three initially free sepals, petals, stamens and carpels that mature in a centripetal order. The connate portion of the corolla, which is also adnate to the stamens, has a late development by zonal growth. Gynoecium formation is a combination of postgenital and congenital fusion processes. Data on floral organogenesis of Rapateaceae are first reported here and support the early diverging position of the family in Poales, close to Bromeliaceae.
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The authors thank FAPESP—Fundação de Amparo à Pesquisa do Estado de São Paulo (Process Number 2014/22991-1) and CNPq—Conselho Nacional de Desenvolvimento Científico e Tecnológico (Process Number 168277/2014-0) for financial support. We also thank Dr Alessandra Ike Coan for collecting the plant material; the technicians Monika Iamonte and Antonio Teruyoshi Yabuki for their support at the Laboratório de Microscopia Eletrônica, UNESP; and Prof. Peter Endress and the anonymous reviewers for their critical comments that improved the manuscript.
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Ferrari, R.C., Oriani, A. Floral anatomy and development of Saxofridericia aculeata (Rapateaceae) and its taxonomic and phylogenetic significance. Plant Syst Evol 303, 187–201 (2017). https://doi.org/10.1007/s00606-016-1361-z
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DOI: https://doi.org/10.1007/s00606-016-1361-z