On the presence of uncommon stylar glandular trichomes in Asteraceae: A study in <i>Kaunia</i> R. M. King and H. Rob. (Oxylobinae, Eupatorieae)

Premise of research. Glands on the styles of Asteraceae are uncommon. They are reported in <i>Kaunia</i> for the first time. Glandular trichomes of plants are involved in the synthesis of secondary metabolites. In <i>Kaunia</i>, secondary compounds with medicinal cytotoxic, a...

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Autores principales: Viera Barreto, Jessica Noelia, Sancho, Gisela, Forte, Noelia Beatriz
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Naturales
Botánica
Compositae
Morphology
Secretory structures
Sesquiterpene lactones
Style
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/98212
https://ri.conicet.gov.ar/11336/54779
https://www.journals.uchicago.edu/doi/10.1086/688709
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-98212
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Botánica
Compositae
Morphology
Secretory structures
Sesquiterpene lactones
Style
spellingShingle Ciencias Naturales
Botánica
Compositae
Morphology
Secretory structures
Sesquiterpene lactones
Style
Viera Barreto, Jessica Noelia
Sancho, Gisela
Forte, Noelia Beatriz
On the presence of uncommon stylar glandular trichomes in Asteraceae: A study in <i>Kaunia</i> R. M. King and H. Rob. (Oxylobinae, Eupatorieae)
topic_facet Ciencias Naturales
Botánica
Compositae
Morphology
Secretory structures
Sesquiterpene lactones
Style
description Premise of research. Glands on the styles of Asteraceae are uncommon. They are reported in <i>Kaunia</i> for the first time. Glandular trichomes of plants are involved in the synthesis of secondary metabolites. In <i>Kaunia</i>, secondary compounds with medicinal cytotoxic, antitumor activity, and sensitizing capacity were previously identified. In this frame, a deeper knowledge of glandular trichomes could shed light on the productivity of medicinal substances in <i>Kaunia</i>. The potential taxonomic and ecological value of stylar glandular trichomes in <i>Kaunia</i> is also explored together with trichome secretion phases throughout the floral developmental stages. Methodology. Herbarium specimens and flowers fixed in FAA of 10 species of <i>Kaunia</i> were analyzed. Flowers in different developmental stages were studied to observe the secretory phases of stylar trichomes. A histochemical test was carried out to detect sesquiterpene lactones on stylar glandular trichomes. Pivotal results. Glandular trichomes were detected on the ventral face of style branches in eight species of <i>Kaunia</i> in all floral stages analyzed. The stylar trichomes observed were mostly found in secretory or early postsecretory phases in the most immature floral stages. The histochemical test in stylar trichomes was positive for sesquiterpene lactones. Conclusions. The presence of stylar glandular trichomes provides valuable new evidence for the identification and characterization of <i>Kaunia</i>. Within the Eupatorieae, the presence of stylar glandular trichomes could be interpreted as taxonomically valuable at the rank of genus. Our finding of sesquiterpene lactones is in agreement with the presence of Guaianolides and Germacranolides previously isolated in <i>Kaunia</i>. Apparently, the secretion of trichomes is completed before the opening of the corolla. The glands on styles of <i>Kaunia</i> could be the most internal barrier to herbivores that could flank outer floral structures during pollen and style development.
format Articulo
Articulo
author Viera Barreto, Jessica Noelia
Sancho, Gisela
Forte, Noelia Beatriz
author_facet Viera Barreto, Jessica Noelia
Sancho, Gisela
Forte, Noelia Beatriz
author_sort Viera Barreto, Jessica Noelia
title On the presence of uncommon stylar glandular trichomes in Asteraceae: A study in <i>Kaunia</i> R. M. King and H. Rob. (Oxylobinae, Eupatorieae)
title_short On the presence of uncommon stylar glandular trichomes in Asteraceae: A study in <i>Kaunia</i> R. M. King and H. Rob. (Oxylobinae, Eupatorieae)
title_full On the presence of uncommon stylar glandular trichomes in Asteraceae: A study in <i>Kaunia</i> R. M. King and H. Rob. (Oxylobinae, Eupatorieae)
title_fullStr On the presence of uncommon stylar glandular trichomes in Asteraceae: A study in <i>Kaunia</i> R. M. King and H. Rob. (Oxylobinae, Eupatorieae)
title_full_unstemmed On the presence of uncommon stylar glandular trichomes in Asteraceae: A study in <i>Kaunia</i> R. M. King and H. Rob. (Oxylobinae, Eupatorieae)
title_sort on the presence of uncommon stylar glandular trichomes in asteraceae: a study in <i>kaunia</i> r. m. king and h. rob. (oxylobinae, eupatorieae)
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/98212
https://ri.conicet.gov.ar/11336/54779
https://www.journals.uchicago.edu/doi/10.1086/688709
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