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Morfología y anatomía foliar comparada de Chuquiraga y géneros afines (Asteraceae)

Content Provider	Springer Nature Link
Author	Padin, Ariana Lucía Calviño, Carolina Isabel Ezcurra, Cecilia
Copyright Year	2015
Abstract	Chuquiraga es un género de arbustos perennifolios endémico de las regiones áridas y semiáridas de los Andes y el sur de Sudamérica. Es el más variable morfológicamente de la subfamilia Barnadesioideae y se caracteriza por una gran diversidad de tipos de hojas. El género se ha clasificado en dos secciones sobre la base de esta variación morfológica: Chuquiraga y Acanthophylla. Dentro de la sección Chuquiraga, dos series, Chuquiraga y Parviflorae, han sido reconocidas teniendo en cuenta la variación en el tamaño de los capítulos. El objetivo de este estudio fue realizar un estudio comparativo de la morfología y anatomía de las hojas de 19 de las 22 especies de Chuquiraga, y de cuatro especies pertenecientes a géneros relacionados (Dasyphyllum, Doniophyton y Duseniella). Nuestros resultados indican que dentro de Chuquiraga se pueden distinguir cuatro tipos morfoanatómicos de hojas: 1) planas, dorsiventrales e hipoestomáticas, 2) planas, isolaterales y anfiestomáticas, 3) cimbiformes, isolaterales y epiestomáticas y, 4) aciculares, dorsiventral invertidas y epiestomáticas. Estos tipos de hojas se pueden correlacionar con las secciones Chuquiraga (Tipos 1 y 2) y Acanthophylla (Tipos 3 y 4), lo que apoya la clasificación tradicional del género. En cambio, las series Chuquiraga y Parviflorae no pueden distinguirse sobre la base de las características observadas de las hojas. Por último, la morfología y anatomía foliar fueron útiles para distinguir a Chuquiraga de géneros relacionados de Barnadesioideae. Los cuatro géneros estudiados presentan diferentes características xeromórficas en su morfología y anatomía foliar. Chuquiraga is a genus of evergreen shrubs endemic to the arid and semiarid regions of the Andes and southern South America. It is the most variable morphologically of the subfamily Barnadesioideae and presents a great diversity of leaf types. The genus has been classified into two sections based on this morphological variation: Chuquiraga and Acanthophylla. Within section Chuquiraga, two series, Chuquiraga and Parviflorae, have been recognized taking into account variation in size of capitula. The objetive of this study was to conduct a comparative study of the morphology and anatomy of leaves of 19 of the 22 species of Chuquiraga, and four species of some of its related genera (Dasyphyllum, Doniophyton, and Duseniella). Our results indicate that four morpho-anatomical leaf types can be distinguished within Chuquiraga: 1) flat, dorsiventral and hypostomatic, 2) flat, isolateral and amphistomatic, 3) boat-shaped, isolateral and epiestomatic and, 4) acicular, dorsiventral inverted and epistomatic. These leaf types can be correlated with sections Chuquiraga (Types 1 and 2) and Acanthophylla (Types 3 and 4), supporting the traditional classification of the genus. In contrast, series Chuquiraga and Parviflorae cannot be distinguished on the basis of the observed leaf characteristics. Finally, leaf morphology and anatomy were useful to distinguish Chuquiraga from related genera of Barnadesioideae. The four genera studied present different xeromorphic characteristics in their leaf morphology and anatomy.
Starting Page	150
Ending Page	165
Page Count	16
File Format	PDF
ISSN	0007196X
Journal	Brittonia
Volume Number	67
Issue Number	2
e-ISSN	1938436X
Language	English
Publisher	Springer US
Publisher Date	2015-02-21
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Sciences Plant Systematics/Taxonomy/Biogeography Plant Anatomy/Development Plant Physiology Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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