✦ LIBER ✦

Evolution of Annual Species of the GenusMedicago: A Molecular Phylogenetic Approach

✍ Scribed by Gilles Bena; Jean-Marie Prosperi; Bernard Lejeune; Isabelle Olivieri

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 125 KB
Volume: 9
Category: Article
ISSN: 1055-7903
DOI: 10.1006/mpev.1998.0493

No coin nor oath required. For personal study only.

✦ Synopsis

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.

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