Transcriptome profiling of two super hybrid rice provides insights into the genetic basis of heterosis

杂种优势 生物 混合的 转录组 遗传学 基因 基因表达谱 水稻 基因表达 生物技术 植物
作者
Jun Fu,Yilin Zhang,Tianze Yan,Yanfeng Li,Nan Jiang,Yunhua Zhou,Qunfeng Zhou,Peng Qin,Chenjian Fu,Haiyan Lin,Jing Zhong,Xue Han,Zhou Lin,Fei Wang,Hang He,Kai Wang,Yuanzhu Yang
出处
期刊:BMC Plant Biology [BioMed Central]
卷期号:22 (1) 被引量:10
标识
DOI:10.1186/s12870-022-03697-4
摘要

Heterosis is a phenomenon that hybrids show superior performance over their parents. The successful utilization of heterosis has greatly improved rice productivity, but the molecular basis of heterosis remains largely unclear.Here, the transcriptomes of young panicles and leaves of the two widely grown two-line super hybrid rice varieties (Jing-Liang-You-Hua-Zhan (JLYHZ) and Long-Liang-You-Hua-Zhan (LLYHZ)) and their parents were analyzed by RNA-seq. Transcriptome profiling of the hybrids revealed 1,778 ~ 9,404 differentially expressed genes (DEGs) in two tissues, which were identified by comparing with their parents. GO, and KEGG enrichment analysis showed that the pathways significantly enriched in both tissues of two hybrids were all related to yield and resistance, like circadian rhythm (GO:0,007,623), response to water deprivation (GO:0,009,414), and photosynthetic genes (osa00196). Allele-specific expression genes (ASEGs) were also identified in hybrids. The ASEGs were most significantly enriched in ionotropic glutamate receptor signaling pathway, which was hypothesized to be potential amino acid sensors in plants. Moreover, the ASEGs were also differentially expressed between parents. The number of variations in ASEGs is higher than expected, especially for large effect variations. The DEGs and ASEGs are the potential reasons for the formation of heterosis in the two elite super hybrid rice.Our results provide a comprehensive understanding of the heterosis of two-line super hybrid rice and facilitate the exploitation of heterosis in hybrid rice breeding with high yield heterosis.
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