Maternal Karyogene and Cytoplasmic Genotype Affect the Induction Efficiency of Doubled Haploid Inducer in Brassica napus

Abstract Background Production of pure lines by double haploid induction provides a new way to achieve homozygosity earlier in Brassica napus. Previously, it is not known, whether the induction has obvious maternal genotypic differences. Results In this study, different karyogene and cytoplasmic genotype of Brassica napus was pollinated with the inducers Y3380 and Y3560. Using the identification of the ploidy, fertility and SSR analysis of the induced F1 generation, it was found that the ploidy and phenotype of the induced F1 plants were consistent with maternal parent. The SNP chip analysis revealed that induction efficiency was affected by the karyogene when the maternal cytoplasmic genotype was the same. However, this efficiency was affected by the cytoplasmic genotype when the karyogenes were same, and the offspring of the ogura cytoplasm easier to high-frequency inducer gene hybridization or low-frequency infiltration. Conclusion The induction effect is influenced by the interaction between maternal karyogene and cytoplasmic genotype, and the results from the partial hybridization of progeny chromosomes indicate that the induction process may be attributed to the selective elimination of paternal chromosome. This study provides a basis for exploring the mechanism of DH inducer in Brassica napus, and provides new insights for utilization of inducers inbreeding.