Heterosis-related genes under different planting densities in maize

文献类型： 外文期刊

第一作者： Ma, Juan

作者： Ma, Juan;Cao, Yanyong;Wang, Lifeng;Li, Jingjing;Li, Huiyong;Zhang, Dengfeng;Wang, Tianyu;Li, Yu;Lubberstedt, Thomas

作者机构：

关键词： Differentially expressed gene; heterosis; maize; planting density; transcriptome; weighted gene co-expression network analysis

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2018 年 69 卷 21 期

页码：

收录情况： SCI

摘要： Heterosis and increasing planting density have contributed to improving maize grain yield (GY) for several decades. As planting densities increase, the GY per plot also increases, whereas the contribution of heterosis to GY decreases. There are trade-offs between heterosis and planting density, and the transcriptional characterization of heterosis may explain the mechanism involved. In this study, 48 transcriptome libraries were sequenced from four inbred Chinese maize lines and their F-1 hybrids. They were planted at densities of 45000 and 67500 plants ha(-1). Maternal-effect differentially expressed genes (DEGs) played important roles in processes related to photosynthesis and carbohydrate biosynthesis and metabolism. Paternal-effect DEGs participated in abiotic/biotic stress response and plant hormone production under high planting density. Weighted gene co-expression network analysis revealed that high planting density induced heterosis-related genes regulating abiotic/biotic stress response, plant hormone biosynthesis, and ubiquitin-mediated proteolysis, but repressed other genes regulating energy formation. Under high planting density, maternal genes were mainly enriched in the photosynthesis reaction center, while paternal genes were mostly concentrated in the peripheral antenna system. Four important genes were identified in maize heterosis and high planting density, all with functions in photosynthesis, starch biosynthesis, auxin metabolism, gene silencing, and RNAi.

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