Trichome structure and evolution in Neotropical lianas

Nogueira, Anselmo; Ottra, Juliana Hanna Leite El; Guimarães, Elza; Machado, Sílvia Rodrigues; Lohmann, Lúcia G.

doi:10.1093/aob/mct201

Cited by 52 publications

(48 citation statements)

References 39 publications

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“…Due to the diversity of glandular trichomes in the tribe, our analyses confirm the reports of several authors that evidenced the taxonomic value of these structures (Bureau and Schumann 1897;Seibert 1948;Gentry 1980;Vilhena-Potiguara et al 2012;Nogueira et al 2013;Gama et al 2013).…”

Section: Discussionsupporting

confidence: 90%

“…The glandular trichomes in Amphilophium magnoliifolium, Martinella obovata and Stizophyllum riparium were identified as morphotypes peltate, capitate, stipitate, patelliform and cupular (sensu Nogueira et al 2013). Due to the diversity of glandular trichomes in the tribe, our analyses confirm the reports of several authors that evidenced the taxonomic value of these structures (Bureau and Schumann 1897;Seibert 1948;Gentry 1980;Vilhena-Potiguara et al 2012;Nogueira et al 2013;Gama et al 2013).…”

Section: Discussionsupporting

confidence: 88%

“…Depending on exudate composition, trichomes may receive functional denominations, like nectaries, which produce nectar, and colleters, which secrete mucilage (Fahn 1979). Glandular trichomes are widely found among the 21 genera of the Bignoniaceae (Nogueira et al 2013). …”

Section: Introductionmentioning

confidence: 99%

“…extrafloral nectaries (EFNs) -are present in 90% of the Bignoniaceae genera (Elias and Gelband 1976). Several authors (Rivera 2000b;Nogueira et al 2013;Gama et al 2013) have shown that these nectaries are trichomes that have a large secretory head. Extrafloral nectaries usually have an intense relationship with insects, particularly ants, which are attracted by the secreted energetic resource (Koptur et al 1998;Heil and McKey 2003;Oliveira and Freitas 2004).…”

Section: Introductionmentioning

confidence: 99%

“…The anatomy of glandular trichomes in the Bignoniaceae has been the object of several studies (Subramanian and Inamdar 1989;Rivera 2000aRivera , 2000bNogueira et al 2013). However, little is known about the morphology and distribution of these characters in tribe Bignonieae.…”

Section: Introductionmentioning

confidence: 99%

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Structure and distribution of glandular trichomes in three species of Bignoniaceae

et al. 2015

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Glandular trichomes play a major role in the morphological characterization of the Bignoniaceae. Due to their great diversity of forms and functions, this study aimed to inventory the glandular trichomes present in the aerial vegetative axis of Amphilophium magnoliifolium, Martinella obovata and Stizophyllum riparium, analyze their structure and register the participation of ants in these plants. Fresh samples from the nodal region, petiole and from medium to apical regions of the leaflet blade were fixed and processed according to usual methods in light and scanning electron microscopies. The glandular trichomes found were: peltate, capitate, stipitate, and patelliform/cupular. Peltate trichomes are the most abundant ones and present the most uniform distribution. Patelliform/cupular trichomes occur at specific regions, such as prophylls, leaflet blade and nodal regions. Martinella obovata is the only species that presents capitate and stipitate trichomes, which are widely distributed along the entire aerial vegetative axis. Ants were found in all species, mainly at nodal regions. The occurrence of the capitate-type trichome is reported for the first time to the genus. KEYWORDS: Bignonieae, Nectaries, Secretory structures, Stipitate trichome. Estrutura e distribuição de tricomas glandulares em três espécies da família Bignoniaceae RESUMOTricomas glandulares desempenham papel importante na caracterização morfológica de Bignoniaceae e, devido à grande diversidade de formas e funções que esses tricomas apresentam, o objetivo desse estudo foi inventariar os tricomas glandulares presentes no eixo vegetativo aéreo de Amphilophium magnoliifolium, Martinella obovata. e Stizophyllum riparium, bem como analisar sua estrutura e registrar a participação de formigas nessas espécies. Amostras frescas da região mediana à apical das lâmina foliolar, pecíolo e nó foram fixadas e processadas de acordo com os métodos usuais para microscopia de luz e eletrônica de varredura. Os tricomas glandulares encontrados nas espécies foram: peltados, capitados, estipitados e pateliformes/cupuliformes. Dentre esses tipos o mais abundante foi o tricoma peltado, apresentando também uma distribuição mais uniforme que os demais. Os tricomas pateliformes/cupuliformes estavam em regiões mais específicas, como profilos, lâmina foliolar e na região nodal. Martinella obovata foi a única espécie que apresentou os tricomas capitados e estipitados, amplamente distribuídos ao longo de todo eixo vegetativo aéreo. Em todas as espécies foram encontradas formigas, principalmente nas regiões nodais. A ocorrência do tricoma capitado é relatada pela primeira vez para o gênero.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure and distribution of glandular trichomes in three species of Bignoniaceae

et al. 2015

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Fine tuning the circumscription ofFridericia(Bignonieae, Bignoniaceae)

Kaehler

Michelangeli

Lohmann

2019

TAXON

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The plant family Bignoniaceae has a complicated history of supra-specific level systematics. In the past decade, molecular phylogenetic studies have contributed substantially to an improved circumscription of clades at all taxonomic levels, especially at the generic and tribal levels. For instance, a molecular phylogeny of the tribe Bignonieae reconstructed a polyphyletic Arrabidaea, and proposed a new circumscription for members of the Arrabidaea & Allies clade. Within this new classification, most species previously included in Arrabidaea were distributed among four genera: Cuspidaria (19 spp.), Fridericia (67 spp.), Tanaecium (17 spp.), and Xylophragma (7 spp.). The taxonomy of Fridericia, the genus that received most species of Arrabidaea, remains complicated due to the high morphological variability and broad distribution of its species. Here, we used molecular data and a broad sampling of taxa within the Arrabidaea & Allies clade to reconstruct the phylogeny of Fridericia. We then studied the morphology of all species of Fridericia and identified morphological synapomorphies that characterize major clades that represent meaningful units for future taxonomic studies. Most genera included in the Arrabidaea & Allies clade were retrieved as monophyletic; however, two species of Fridericia were reconstructed within Cuspidaria, while three species of Fridericia were placed within Tanaecium. The molecular phylogenetic placements received additional support from morphology, and the necessary taxonomic changes are proposed. We combine three species of Fridericia into Tanaecium (T. dichotomum comb. nov., T. paradoxum comb. nov., T. parviflorum comb. nov.), two species into Xylophragma (X. claussenii comb. nov., X. corchoroides comb. nov.), two species into Cuspidaria (C. bracteolata comb. nov., C. monophylla comb. nov.), and one species of Adenocalymma into Fridericia (F. trichoclada comb. nov.). We also synonymize Fridericia whitei into Cuspidaria pulchra. We present a key for the seven main clades identified within the genus, as well as a detailed morphological description for Fridericia and its major lineages.

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