Are the trichomes in corollas of Mutisieae (Asteraceae) really twin hairs?

The corollas of three species of Onoseris, 13 species of Trichocline and one species of Uechtritzia (Asteraceae, Mutisieae) exhibit trichomes that are morphologically similar to the twin hairs which are traditionally considered exclusive of the cypselas in Asteraceae. Four types of trichomes were fo...

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Detalles Bibliográficos
Autores principales: Sancho, Gisela, Katinas, Liliana
Formato: Articulo
Lenguaje:Inglés
Publicado: 2002
Materias:
Ciencias Naturales
Onoseris
Ontogeny
Trichocline
Uechtritzia
Zwillingshaare
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83349
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83349
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
Onoseris
Ontogeny
Trichocline
Uechtritzia
Zwillingshaare
spellingShingle Ciencias Naturales
Onoseris
Ontogeny
Trichocline
Uechtritzia
Zwillingshaare
Sancho, Gisela
Katinas, Liliana
Are the trichomes in corollas of Mutisieae (Asteraceae) really twin hairs?
topic_facet Ciencias Naturales
Onoseris
Ontogeny
Trichocline
Uechtritzia
Zwillingshaare
description The corollas of three species of Onoseris, 13 species of Trichocline and one species of Uechtritzia (Asteraceae, Mutisieae) exhibit trichomes that are morphologically similar to the twin hairs which are traditionally considered exclusive of the cypselas in Asteraceae. Four types of trichomes were found: 1-celled, 2-celled, 3-celled, and 4-celled. The 3-celled and 4-celled corolla hairs are those which most resemble the typical cypsela twin hairs. The ontogeny of the corolla hairs was analysed and coincidences with the ontogeny of the cypsela twin hairs were found. (1) An anticlinal division of the epidermal mother cell originates two hair cells which, in turn, originate the basal cells (sometimes one of them is reduced or similar to the epidermal cells) by oblique or periclinal subdivision. (2) In some cases the basal cell(s) of the 3- or 4-celled corolla hair elongates and reaches the same length as the hair cells. The same kind of trichomes have been demonstrated in cypselas of Mutisieae. (3) The 1- and 2-celled corolla hairs have already been described as variants of the cypsela twin hairs. Based on this evidence we conclude that the corolla hairs of Onoseris, Trichocline and Uechtritzia are twin hairs. It is hypothesized that the 1-4 corolla hairs could be involved in water absorption, as occurs in the cypsela twin hairs.
format Articulo
Articulo
author Sancho, Gisela
Katinas, Liliana
author_facet Sancho, Gisela
Katinas, Liliana
author_sort Sancho, Gisela
title Are the trichomes in corollas of Mutisieae (Asteraceae) really twin hairs?
title_short Are the trichomes in corollas of Mutisieae (Asteraceae) really twin hairs?
title_full Are the trichomes in corollas of Mutisieae (Asteraceae) really twin hairs?
title_fullStr Are the trichomes in corollas of Mutisieae (Asteraceae) really twin hairs?
title_full_unstemmed Are the trichomes in corollas of Mutisieae (Asteraceae) really twin hairs?
title_sort are the trichomes in corollas of mutisieae (asteraceae) really twin hairs?
publishDate 2002
url http://sedici.unlp.edu.ar/handle/10915/83349
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bdutipo_str Repositorios
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