Abstract
Second division restitution was found to be the cause of high fertility observed in an interspecific triploid hybrid in Arachis (cv. Co-1×A. chacoense Krap. et Greg. nom. nud., 2n=3x=30). Precocious centrometic division followed by equational division led to the production of unreduced gametes. Occurrence of a few multivalents at diakinesis indicated intergenomic exchange prior to SDR. Selfed progeny of the triploid predominantly contained hexaploids along with a few pentaploid, tetraploid and aneuploid segregants. Breeding implications of this fertile triploid in reducing the number of generations needed for gene-introgression from wild specied into cultivars were discussed.
