NDLI: Systematic significance and evolutionary dynamics of the achene twin hairs in Filago (Asteraceae, Gnaphalieae) and related genera: further evidence of morphological homoplasy

Content Provider	Springer Nature Link
Author	Andrés Sánchez, Santiago Galbany Casals, Mercè Bergmeier, Erwin Rico, Enrique Martínez Ortega, M. Montserrat
Copyright Year	2014
Abstract	The variation and evolutionary dynamics of the twin hairs covering the achenes of the external female florets in Filago and related genera are studied using scanning electron microscope (SEM) and a Bayesian reconstruction of ancestral character states. A molecular phylogenetic hypothesis based on sequences of ITS and ETS (nuclear ribosomal DNA) and plastid rpl32-trnL intergenic spacer regions was used as a framework to test the phylogenetic, evolutionary and taxonomic significance of this character in the study group. The phylogenetic position of three island-endemic species (F. petro-ianii, F. tyrrhenica and F. wagenitziana) is explored. Three types of twin hairs are described, which alone or combined define five different types of indumentum. The results suggest that glabrous achenes are the ancestral condition for “Filago group s.str.”, while the presence of long-clavate twin hairs on the achene represents the ancestral character state for the genus Filago. Several cases of parallelisms are detected. With regard to taxonomy, twin hairs provide additional support for the recognition of Bombycilaena and Logfia at the generic level and allow the taxonomic re-evaluation of F. lutescens subsp. atlantica and F. crocidion. Finally, the utility of a Bayesian Binary MCMC approach (using the software RASP) for evolutionary reconstruction of morphological characters is demonstrated.
Starting Page	1653
Ending Page	1668
Page Count	16
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	301
Issue Number	6
e-ISSN	21996881
Language	English
Publisher	Springer Vienna
Publisher Date	2014-12-11
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bombycilaena Evolution of twin hairs Filago Homoplasy Logfia Reticulation Plant Sciences Plant Ecology Plant Anatomy/Development Plant Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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