NDLI: Chromosome Numbers and Karyotypes of Species of Vernonia sect. Lepidaploa (Asteraceae: Vernonieae)

Content Provider	Springer Nature Link
Author	Oliveira, Vanessa Mancuso Semir, João Forni Martins, Eliana Regina
Copyright Year	2011
Abstract	Vernonia is the largest genus of the tribe Vernonieae (Asteraceae) and comprises more than 1,000 species. In the present study we explore chromosome number and karyotype variation of eight species treated within different subsections of the section Vernonia sect. Lepidaploa. We aimed to explore if these data support the recognition of a single large genus (sensu Baker) or favor its splitting into 22 small genera (sensu Robinson). The species were collected in “cerrado”, rupicolous and disturbed areas in the states of São Paulo and Minas Gerais, Brazil. Chromosome numbers varied from 2n = 32 to 60. Most chromosomes were small, and the karyotype analysis revealed a predominance of metacentric and some submetacentric chromosomes. The karyotype symmetry in Vernonia was moderate (TF% 32.2 to 45.9), with the most symmetrical karyotype observed in V. rubriramea. The results obtained here did not conclusively support any of the taxonomic proposals for Vernonia due to the absence of distinctive or characteristic karyotype patterns for any of the taxonomic groupings, i.e., sections and subsections (sensu Baker) or new genera (sensu Robinson). Nevertheless, a tenuous relationship was observed between the chromosome numbers reported in the literature, those recorded here, and the taxonomic alterations suggested by Robinson for the genera Lessingianthus, Chrysolaena, and Vernonanthura that were originally part of Vernonia sensu Baker.
Starting Page	93
Ending Page	103
Page Count	11
File Format	PDF
ISSN	12119520
Journal	Folia Geobotanica
Volume Number	47
Issue Number	1
e-ISSN	18749348
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-06-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cytotaxonomy Idiograms Mitosis Plant Systematics/Taxonomy/Biogeography Plant Sciences Life Sciences Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Paleontology

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