title: Comparative transcriptional profiling and preliminary study on heterosis mechanism of super-hybrid rice.
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 heterosis. Transcriptional profiling of F(1) 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 pathways such as photosynthesis and carbon-fixation, and most of the key genes involved in the carbon-fixation pathway exhibited up-regulated expression in F(1) hybrid rice. Moreover, increased catabolic activity of corresponding enzymes and photosynthetic efficiency were also detected, which combined to indicate that carbon fixation is enhanced in F(1) hybrid, and might probably be associated with the yield vigor and heterosis in super-hybrid rice. By correlating DGs with yield-related quantitative trait loci (QTL), a potential relationship between differential gene expression and phenotypic changes was also found. In addition, a regulatory network involving circadian-rhythms and light signaling pathways was also found, as previously reported in Arabidopsis, which suggest that such a network might also be related with heterosis in hybrid rice. Altogether, the present study provides another view for understanding the molecular mechanism underlying heterosis in rice.
authors: State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
authors: Gui-Sheng
authors: GS
authors: Song
authors: Hong-Li
authors: HL
authors: Zhai
authors: Yong-Gang
authors: YG
authors: Peng
authors: Lei
authors: L
authors: Zhang
authors: Gang
authors: G
authors: Wei
authors: Xiao-Ying
authors: XY
authors: Chen
authors: Yu-Guo
authors: YG
authors: Xiao
authors: Lili
authors: L
authors: Wang
authors: Yue-Jun
authors: YJ
authors: Chen
authors: Bin
authors: B
authors: Wu
authors: Bin
authors: B
authors: Chen
authors: Yu
authors: Y
authors: Zhang
authors: Hua
authors: H
authors: Chen
authors: Xiu-Jing
authors: XJ
authors: Feng
authors: Wan-Kui
authors: WK
authors: Gong
authors: Yao
authors: Y
authors: Liu
authors: Zhi-Jie
authors: ZJ
authors: Yin
authors: Feng
authors: F
authors: Wang
authors: Guo-Zhen
authors: GZ
authors: Liu
authors: Hong-Lin
authors: HL
authors: Xu
authors: Xiao-Li
authors: XL
authors: Wei
authors: Xiao-Ling
authors: XL
authors: Zhao
authors: Pieter B F
authors: PB
authors: Ouwerkerk
authors: Thomas
authors: T
authors: Hankemeier
authors: Theo
authors: T
authors: Reijmers
authors: Rob
authors: R
authors: van der Heijden
authors: Cong-Ming
authors: CM
authors: Lu
authors: Mei
authors: M
authors: Wang
authors: Jan
authors: J
authors: van der Greef
authors: Zhen
authors: Z
authors: Zhu
mesh_terms: D057486:Carbon Cycle / Q000235:genetics; D020869:Gene Expression Profiling; D053263:Gene Regulatory Networks / Q000235:genetics; D006823:Hybrid Vigor / Q000235:genetics*; D006824:Hybridization, Genetic / Q000235:genetics*; D012275:Oryza / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism / Q000502:physiology; D010788:Photosynthesis / Q000235:genetics; D040641:Quantitative Trait Loci / Q000235:genetics; D014158:Transcription, Genetic / Q000235:genetics*