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

Inter-section hybrids were successfully obtained by rescuing the immature e mbryos 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 g enome of P. obconica, whereas the remaining one had one genome of P. siebol dii and two genomes of P. obconica. The possibilities of diploid female gam ete formation in P, sieboldii and diploid pollen formation in P. obconica a s the causal factors for these triploid formations were discussed.