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Transcriptome shock in an interspecific F1 triploid hybrid of Oryza revealed by RNA sequencing
Author(s) -
Wu Ying,
Sun Yue,
Wang Xutong,
Lin Xiuyun,
Sun Shuai,
Shen Kun,
Wang Jie,
Jiang Tingting,
Zhong Silin,
Xu Chunming,
Liu Bao
Publication year - 2016
Publication title -
journal of integrative plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.734
H-Index - 83
eISSN - 1744-7909
pISSN - 1672-9072
DOI - 10.1111/jipb.12357
Subject(s) - biology , transcriptome , genetics , gene , gene expression , genome , interspecific competition , gene expression profiling , hybrid , oryza sativa , in silico , oryza , heterosis , rna seq , botany
Interspecific hybridization is a driving force in evolution and speciation of higher plants. Interspecific hybridization often induces immediate and saltational changes in gene expression, a phenomenon collectively termed “transcriptome shock”. Although transcriptome shock has been reported in various plant and animal taxa, the extent and pattern of shock‐induced expression changes are often highly idiosyncratic, and hence entails additional investigations. Here, we produced a set of interspecific F1 triploid hybrid plants between Oryza sativa , ssp. japonica (2 n = 2 x = 24, genome AA) and the tetraploid form of O. punctata (2 n = 4 x = 48, genome, BBCC), and conducted RNA‐seq transcriptome profiling of the hybrids and their exact parental plants. We analyzed both homeolog expression bias and overall gene expression level difference in the hybrids relative to the in silico “hybrids” (parental mixtures). We found that approximately 16% (2,541) of the 16,112 expressed genes in leaf tissue of the F1 hybrids showed nonadditive expression, which were specifically enriched in photosynthesis‐related pathways. Interestingly, changes in the maternal homeolog expression, including non‐stochastic silencing, were the major causes for altered homeolog expression partitioning in the F1 hybrids. Our findings have provided further insights into the transcriptome response to interspecific hybridization and heterosis.