Comparative Transcriptional Profiling and Preliminary Study on Heterosis Mechanism of

ABSTRACT Heterosis is a biological phenomenon whereby the offspring from two parents show improved and superior performance than either inbred parental lines. Hybrid rice is one of the most successful apotheoses in crops utilizing het-erosis. Transcriptional profiling of F1 super-hybrid rice Liangyou-2186 and its parents by serial analysis of gene expression (SAGE) revealed 1183 differentially expressed genes (DGs), among which DGs were found significantly enriched in path-ways such as photosynthesis and carbon-fixation, and most of the key genes involved in the carbon-fixation pathwa