Evidences of segmental allopolyploidy in Arachis nitida (Section Rhizomatosae, Leguminosae)

ORTIZ, A.M.; SEIJO, J.G.; FERNÁNDEZ, A; LAVIA, G.I.

Buenos Aires (Argentina)

Encuentro; VII Encuentro Internacional de Especialistas en Arachis; 2010

Instituto Nacional de Tecnología Agropecuaria - INSTITUTO DE BOTÁNICA DEL NORDESTE

Rhizomatosae is defined by the presence of rhizomes in their four entities. From an evolutional point of view, this section is interesting because it has the highest frequency of polyploid species, including three tetraploids (A. glabrata, A. nitida, A. pseudovillosa), all them with 2n=40. Previous cytological analyses have suggested an autopolyploid origin to A. glabrata; however, the nature of the others rhizomatous tetraploids and their probable progenitors still remains unknown. Therefore, a detailed cytological analysis was carried out on A. nitida, including both classical and molecular cytogenetic techniques, to provide some hints about their genetic origin. CMA