Evolution of annual species of the genus Medicago: a molecular phylogenetic approach

We performed a molecular phylogenetic study based on the nuclear ribosomal internal and external transcribed spacer (ITS and ETS). Thirty-one annual Medicago species were included in the study, representing more than half of the genus and 85% of the annuals of the genus. Major incongruences were fou...

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Bibliographic Details
Published inMolecular phylogenetics and evolution Vol. 9; no. 3; pp. 552 - 559
Main Authors Bena, G, Prosperi, J M, Lejeune, B, Olivieri, I
Format Journal Article
LanguageEnglish
Published United States Elsevier 01.06.1998
Subjects
Biodiversity and Ecology
Chromosome Deletion
DNA Primers
DNA, Plant - genetics
domain_sde.be.gp
Environmental Sciences
Evolution, Molecular
Karyotyping
Medicago sativa - classification
Medicago sativa - genetics
Models, Genetic
Phylogeny
Polymerase Chain Reaction
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Summary:We performed a molecular phylogenetic study based on the nuclear ribosomal internal and external transcribed spacer (ITS and ETS). Thirty-one annual Medicago species were included in the study, representing more than half of the genus and 85% of the annuals of the genus. Major incongruences were found between phylogenetic relationships and morphological classification of the genus. Morphological and cytological traits were mapped onto the phylogeny. The most parsimonious reconstruction suggested an ancestral spiny state and a recurrent transition from spiny to spineless state. From the ancestral state of 2n=16, three loss events of chromosomes must have occurred leading to the same specific number of 14 chromosomes whereas species having 30 chromosomes form a monophyletic clade.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:1055-7903
1095-9513
DOI:10.1006/mpev.1998.0493