Revealing biomass heterosis in the allodiploid xBrassicoraphanus, a hybrid between Brassica rapa and Raphanus sativus, through integrated transcriptome and metabolites analysis

• DOI: 10.1186/s12870-020-02470-9
• Publication Date: 2020-06-03T14:34:16Z
• Authors: Gibum Yi; Hosub Shin; Hye Rang Park; Jeong Eun Park; Jong Hwa Ahn; Sooyeon Lim; Jeong Gu Lee; Eun Jin Lee; Jin Hoe Huh
• Keywords: Raphanus; Brassica rapa; Secondary metabolism; Metabolome

Abstract Background Heterosis is biologically important but the molecular basis of phenomenon poorly understood. We characterized intergeneric hybrids between B. rapa cv. Chiifu and R. sativus WK10039 as an extreme example heterosis. Taking advantage clear heterosis phenotypes genetic distance parents, we performed transcriptome metabolite analysis to decipher Results The was expressed fresh weight in field inflorescence stem length glass house. Flowering time, distributed a normal segregating population, ranged from early flowering one parent late other, contrast homogeneous time typical F1 indicating unstable allelic interactions. metabolome both indicated that sugar metabolism altered, suggesting change linked Because alleles were not shared hybridized genomes, classic models only partly explain this heterosis, other mechanisms are involved. Conclusion differential expression genes for primary secondary metabolism, along with altered profiles, suggests could involve balance metabolism.