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Comparative transcriptomic analysis of heterotic maize development during kernel filling.

Wenyu Li1, Xiangkun Guo1, Wen Yao2

  • 1The State Key Laboratory of Wheat and Maize Crop Science, Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Longzi Lake Campus, Zhengzhou, China.

Plant Molecular Biology
|April 2, 2025
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Summary
This summary is machine-generated.

Maize heterosis enhances yield through increased kernel size and storage substances. Gene expression analysis reveals key metabolic pathways and the transcription factor bZIP88 contribute to these improved traits.

Keywords:
HeterosisKernelMaizeWeight

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Area of Science:

  • Plant genetics and breeding
  • Molecular mechanisms of heterosis
  • Maize (Zea mays) kernel development

Background:

  • Heterosis, or hybrid vigor, enhances crop performance but its molecular basis is not fully understood.
  • Maize breeding utilizes heterosis, yet the underlying genetic and molecular drivers remain elusive.
  • Understanding heterosis is crucial for improving crop yields and food security.

Purpose of the Study:

  • To investigate the molecular mechanisms of heterosis in the maize hybrid Yudan132.
  • To identify differentially expressed genes (DEGs) and their associated pathways contributing to enhanced kernel traits.
  • To explore the role of specific genes, such as bZIP88, in maize kernel development and heterosis.

Main Methods:

  • Comparative gene expression profiling of Yudan132 and its parental lines across four kernel developmental stages.
  • Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis of DEGs.
  • Identification and functional analysis of key genes, including transcription factors, involved in heterosis.

Main Results:

  • Yudan132 exhibited superior agronomic traits, including larger ear/kernel size and increased yield, due to enhanced storage substance accumulation.
  • DEGs showed both additive and non-additive expression patterns, contributing to kernel heterosis.
  • Enriched pathways involved metabolism, secondary metabolite biosynthesis, carbon, and starch/sucrose metabolism, with key genes like peroxidase and bZIP88 identified.

Conclusions:

  • Differentially expressed genes and specific metabolic pathways are integral to maize kernel heterosis.
  • The transcription factor bZIP88 is implicated in regulating kernel size and weight, potentially mediating heterotic effects.
  • This study elucidates the genetic basis of heterosis in maize kernel development, offering insights for breeding strategies.