文献类型： 外文期刊

作者： Wang, Liangfa ¹ ; Li, Juan ¹ ; Lin, Yuan ² ; Dang, Kuntai ² ; Wan, Jiong ² ; Meng, Shujun ² ; Qiu, Xiaoqian ² ; Wang, Qiyue ² ; Mu, Liqin ² ; Ding, Dong ² ; Luo, Hongbing ¹ ; Tang, Jihua ² ;

作者机构： 1.Hunan Agr Univ, Coll Agron, Changsha 410128, Peoples R China

2.Henan Agr Univ, Coll Agron, Collaborat Innovat Ctr Henan Grain Crops, Natl Key Lab Wheat & Maize Crop Sci, Zhengzhou 450002, Peoples R China

3.Hebi Acad Agr Sci, Hebi 458030, Peoples R China

4.Guizhou Acad Agr Sci, Inst Crop Germplasm Resources, Guiyang 550006, Peoples R China

5.Shennong Lab, Zhengzhou 450002, Peoples R China

期刊名称：PLANT GENOME （ 影响因子：4.219； 五年影响因子：5.826 ）

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收录情况： SCI

摘要： Important traits related to maize (Zea mays L.) grain yield, such as kernel row number, ear length, kernel number per row, are determined during the development of female inflorescence. There is a significant positive correlation between yield component and the activity of inflorescence meristem (IM). To find the key stage of heterosis in the development of the ear, immature ears (from the IM stage until the end of the floral meristem [FM] stage) of Yudan888 and its parent lines were sampled to assay phenotype and for comparative transcriptomics analysis. The immature ear length of Yudan888 at the IM stage fitted an additive (mid-parental) model, but it showed high parental dominance at the spikelet-pair meristem (SPM) stage. Comparative analysis of transcriptomes suggested significant differences between additive and nonadditive expression patterns for different developmental stages. The number of distinct maternal or paternal genes (DMP) (genes expressed only in one parental line and their hybrid but silenced in another line) was greater than ABF1 (genes expressed in both parental lines but silenced in hybrid) at each stage. Gene Ontology (GO) enrichment suggested that the cell redox homeostasis genes with overdominance expression patterns in hybrids have an important contribution to heterosis. According to our research, an ear length heterosis network was established. The discovery of the inflection point for ear length heterosis allows us for inferring that the transition state of IM to SPM may be the starting point of ear length heterosis. These findings improved the understanding of maize ear length heterosis.