Gene expression variation explains maize seed germination heterosis.
Gene expression variation explains maize seed germination heterosis.
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基因表达变异解释了玉米种子发芽杂种优势。
DOI：
10.1186/s12870-022-03690-x
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发表时间：
2022-06-20
影响因子：
5.3
通讯作者：
Tang, Jihua
中科院分区：
文献类型：
--
作者：
Wan, Jiong;Wang, Qiyue;Zhao, Jiawen;Zhang, Xuehai;Guo, Zhanyong;Hu, Desheng;Meng, Shujun;Lin, Yuan;Qiu, Xiaoqian;Mu, Liqin;Ding, Dong;Tang, Jihua
杂种优势已广泛应用于植物育种中，然而，其潜在的分子机制仍然很大程度上难以捉摸。玉米(Zea mays)具有很强的杂种优势，是研究杂种优势的理想材料。在本研究中，互交郑单958杂种在种子萌发过程中比其亲本系具有更快的吸胀和发育速度。为了研究玉米发芽杂种优势的机制，进行了比较转录组分析。基因表达谱显示，在正单958的互交中，杂种与亲本间的差异表达基因分别有1324个（47.27%）和1592个（66.44%）显示出亲本显性或更高水平。值得注意的是，这些基因主要富集于代谢途径，包括碳代谢、糖酵解/糖异生、内质网蛋白质加工等。我们的研究结果为杂种中参与代谢途径的较高表达水平基因是玉米种子发芽杂种优势的主要贡献者提供了证据。这些发现为玉米胚的基因表达变异提供了新的见解，并提高了对玉米种子萌发杂种优势的理解。在线版本包含可在 10.1186/s12870-022-03690-x 获取的补充材料。
Heterosis has been extensively utilized in plant breeding, however, the underlying molecular mechanism remains largely elusive. Maize (Zea mays), which exhibits strong heterosis, is an ideal material for studying heterosis. In this study, there is faster imbibition and development in reciprocal crossing Zhengdan958 hybrids than in their parent lines during seed germination. To investigate the mechanism of heterosis of maize germination, comparative transcriptomic analyses were conducted. The gene expression patterns showed that 1324 (47.27%) and 1592 (66.44%) of the differential expression genes between hybrids and either parental line display parental dominance up or higher levels in the reciprocal cross of Zhengdan958, respectively. Notably, these genes were mainly enriched in metabolic pathways, including carbon metabolism, glycolysis/gluconeogenesis, protein processing in endoplasmic reticulum, etc. Our results provide evidence for the higher expression level genes in hybrid involved in metabolic pathways acting as main contributors to maize seed germinating heterosis. These findings provide new insights into the gene expression variation of maize embryos and improve the understanding of maize seed germination heterosis. The online version contains supplementary material available at 10.1186/s12870-022-03690-x.
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