Genomic affinity in hybrids of B-genome Arachis species: new genetic resources towards peanut improvement

A V GARCÍA; SILVESTRI MC; VANDECAVEYE MELINA; A CUSTODIO; MORETZSOHN; LAVIA GI

CROP BREEDING AND APPLIED BIOTECHNOLOGY

BRAZILIAN SOC PLANT BREEDING

Año: 2021

1518-7853

Peanut (Arachis hypogaea L.) is important for domestic consumption and oil production.However, the crop is underdeveloped due to its susceptibility to biotic and abiotic factors. WildArachis species represent useful genetic resources due to their resistance to pests and diseases.Particularly, B genome species are important to broaden the genetic base of A. hypogaea (AABBgenome), since only one population of A. ipaënsis (peanut progenitor with B genome) is known.Therefore, we aimed to determine the genomic affinity between A. ipaënsis and A. williamsii bydeveloping hybrids. Microsatellite markers verified the hybrid status and chromosome pairing andpollen viability results revealed that the species share high genomic affinity. Additionally, thepresence of dyads detected in sporad and pollen analyses evidenced the production of 2n gametes.These results will be useful to perform evolutionary studies and develop strategies for introgressionprograms to improve the B genome of A. hypogaea.