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Phenotypic Characterization and Transcriptome Analysis of the Dwarf Mutant zmbrd1 in Maize
Li Qin1, Yu Bao1, Chunlei Du2
1Institute of Advanced Agricultural Technology, Qilu Normal University, Jinan 250200, China.
Genes
|December 30, 2025
Summary
A new maize mutant, ZmBRD1, shows severe dwarfism due to disrupted brassinosteroid biosynthesis. This leads to hormonal imbalance and reduced cell elongation, impacting both aboveground and underground growth.
Area of Science:
- Plant Biology
- Genetics
- Agricultural Science
Background:
- Maize (Zea mays L.) is a crucial global crop facing food security challenges.
- Improving maize yield via dwarfing breeding is a promising strategy, yet genetic diversity in dwarf genes is limited.
- Brassinosteroids (BRs) are key plant hormones regulating height; mutations in BR-related genes often cause dwarfism.
Purpose of the Study:
- To investigate the genetic basis of dwarfism in a novel maize mutant, ZmBRD1.
- To elucidate the role of ZmBRD1 in plant height regulation and its connection to hormonal pathways.
- To identify genetic resources for enhancing maize breeding through dwarfing strategies.
Main Methods:
- Generated the ZmBRD1 mutant using EMS mutagenesis in the B73 maize background.
- Compared phenotypic traits (plant height, root length) and histological features between mutant and wild-type plants.
- Performed transcriptome sequencing, GO/KEGG enrichment analysis, and qRT-PCR to identify differentially expressed genes and validate hormone-related gene expression.
Main Results:
- The ZmBRD1 mutant displayed severe dwarfism and reduced root length, attributed to inhibited internode cell elongation.
- Transcriptome analysis revealed significant differentially expressed genes (DEGs) in leaves and roots, enriched in BR biosynthesis, hormone signal transduction, and glutathione metabolism pathways.
- Hormonal imbalance was observed, with downregulated GA biosynthesis genes and altered auxin-related gene expression in leaves and roots, alongside evidence of oxidative stress and impaired defense responses in roots.
Conclusions:
- The dwarf phenotype of ZmBRD1 results from disrupted brassinosteroid biosynthesis, causing hormonal crosstalk imbalances (GA, auxin) and affecting cell elongation.
- ZmBRD1 integrates aboveground and underground growth, likely by modulating hormone crosstalk.
- This study provides insights into BR-mediated height regulation and offers valuable genetic resources for maize breeding programs aiming for yield improvement.
