show Abstracthide AbstractThe genome sequence of B. napus is now available and together with the next-generation sequencing technology, provides an unprecedented opportunity to address questions concerning gene expression changes and epigenetic variations between the two parents and their F1 hybrids are associated with heterosis in allopolyploid B. napus. In this study, we investigated the dynamic transcriptomes, small RNAomes and DNA methylomes of an F1 hybrid and its two parents at three early flower developmental stages of B. napus.