Transcriptome shock in an interspecific F1 triploid hybrid of Oryza revealed by RNA sequencing
文献类型: 外文期刊
第一作者: Wu, Ying
作者: Wu, Ying;Sun, Yue;Wang, Xutong;Sun, Shuai;Shen, Kun;Wang, Jie;Jiang, Tingting;Xu, Chunming;Liu, Bao;Lin, Xiuyun;Zhong, Silin
作者机构:
关键词: Cis- and trans-regulation;homeolog expression rewiring;interspecific hybrid;Oryza;promoter divergence;transcriptome shock
期刊名称:JOURNAL OF INTEGRATIVE PLANT BIOLOGY ( 影响因子:7.061; 五年影响因子:6.002 )
ISSN: 1672-9072
年卷期: 2016 年 58 卷 2 期
页码:
收录情况: SCI
摘要: 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 (2n=2x=24, genome AA) and the tetraploid form of O. punctata (2n=4x=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.
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