Different genomic combinations in inter-section hybrids obtained from the crosses between Primulasieboldii (Section Cortusoides) and P. obconica (Section Obconicolisteri) by the embryo rescue technique

Abstract 

Inter-section hybrids were successfully obtained by rescuing the immature embryos produced in the cross between Primula sieboldii of Sect. Cortusoides and P. obconica of Sect. Obconicolisteri. In these hybrid plants two types of triploids with different genome combinations were found in addition to the normal diploid hybrids which each had one genome of the parents. Among the five triploids obtained, four had two genomes of P. sieboldii and one genome of P. obconica, whereas the remaining one had one genome of P. sieboldii and two genomes of P. obconica. The possibilities of diploid female gamete formation in P. sieboldii and diploid pollen formation in P. obconica as the causal factors for these triploid formations were discussed.