IBONE   05434
INSTITUTO DE BOTANICA DEL NORDESTE
Unidad Ejecutora - UE
capítulos de libros
Título:
Cytogenetic and Molecular Evidences on the Evolutionary Relationships Among Arachis Species
Autor/es:
LAVIA, G. I.; FERNÁNDEZ, A.; SEIJO, J. G.
Libro:
Plant Genome: Biodiversity and Evolution. Volume 1E: Phanerogam-Angiosperm
Editorial:
Science Publishers
Referencias:
Lugar: Enfield, OH, USA; Año: 2008; p. 101 - 134
Resumen:
The new cytogenetic and molecular data relating to the peanut, its secondary/tertiary gene pool, and the Arachis species that are being used as forage are integrated with the large existent biosystematic knowledge to combine information on the genetic origin of the cultigen, species relationships within Arachis section, the evolutionary relatedness of x=9, and the origin of polyploids of Rhizomatosae and Caulorrhizae sections. The alJopolyploid nature of peanut was confirmed as having two complements with heterochromatic bands and two without them in al! botanical varieties. Gene mapping by FISH, most molecular markers and amphidiploid resynthesis support A. duranensis and A. ipaensis as the most probable geno me donors of A. hypogaea. Moreover, A. monticola is revealed as the wild tetraploíd from whích the peanut derived upon domestication rather than a wild derivative. Although the clase relatedness of some species has been established, a clear phylogeny of section Arachis has still to be delineated. Basic chromosome number x=9 may has arisen from x=lO independently in different sections. Rhizomatous species appears as a polyphyletic group in which the diploid A. burkartii seems to have a -different- genome constitution differeing from that of the tetraploids. Meiotic behavior of A. pintoi suggests that spontaneous polyploidization in Arachis might  through unreduced gametes.