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Updated: Sep 7, 2025

Agrobacterium-Mediated Immature Embryo Transformation of Recalcitrant Maize Inbred Lines Using Morphogenic Genes
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Gene expression variation explains maize seed germination heterosis.

Jiong Wan1, Qiyue Wang1, Jiawen Zhao1

  • 1National Key Laboratory of Wheat and Maize Crop Science, College of Agronomy, Henan Agricultural University, Zhengzhou, 450002, China.

BMC Plant Biology
|June 19, 2022
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Summary

Maize hybrids show faster seed germination than parent lines due to enhanced metabolic gene expression. This study reveals key molecular insights into heterosis during maize germination.

Keywords:
Gene regulationHeterosisMaizeSeed germination

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Area of Science:

  • Plant Breeding
  • Genetics
  • Molecular Biology

Background:

  • Heterosis, or hybrid vigor, is crucial in plant breeding but its molecular basis is not fully understood.
  • Maize (Zea mays) displays significant heterosis, making it a model organism for studying this phenomenon.

Purpose of the Study:

  • To investigate the molecular mechanisms driving heterosis in maize seed germination.
  • To identify genes and pathways contributing to enhanced germination in maize hybrids.

Main Methods:

  • Comparative transcriptomic analysis of reciprocal crossing Zhengdan958 hybrids and their parent lines.
  • Analysis of gene expression patterns during seed germination.

Main Results:

  • Maize hybrids exhibited faster imbibition and development compared to parent lines.
  • A significant number of differentially expressed genes in hybrids showed parental dominance or higher expression.
  • Enriched metabolic pathways included carbon metabolism and glycolysis/gluconeogenesis.

Conclusions:

  • Higher expression of genes involved in metabolic pathways contributes significantly to maize seed germination heterosis.
  • Findings offer new insights into gene expression variations in maize embryos and heterosis.
  • Improved understanding of the molecular basis of maize seed germination heterosis.