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Comparative transcriptome analysis uncovers cell wall reorganization and repressed cell division during cotton fiber
Wenyuan Liu1, Yanjia Lv1, Xiaoyue Li1
1College of Life Science, Linyi University, Linyi, 276000, Shandong, China.
BMC Developmental Biology
|October 30, 2021
Summary
Understanding cotton lint fiber initiation requires studying transcriptional regulation. This study identified differentially expressed genes (DEGs) in a cotton mutant, revealing key genes involved in fiber development and cell wall organization.
Area of Science:
- Plant Biology
- Genetics
- Molecular Biology
Background:
- Tetraploid cotton is a vital natural fiber source.
- Understanding transcriptional regulation of lint fiber initiation is crucial for meeting global demand.
- Existing omics studies provide some insights but deeper understanding is needed.
Purpose of the Study:
- To identify differentially expressed genes (DEGs) during early lint fiber initiation in cotton.
- To compare gene expression between a wild-type cotton variety (Xu142) and its fiberless mutant (Xu142fl).
- To elucidate the transcriptional regulatory mechanisms underlying lint fiber development.
Main Methods:
- Transcriptome sequencing of cotton ovules during early lint fiber initiation.
- Identification and analysis of differentially expressed genes (DEGs).
- Gene Ontology (GO) enrichment analysis to determine functions of DEGs.
Main Results:
- Identified 5516 DEGs (1840 upregulated, 3676 downregulated) between Xu142 and Xu142fl.
- Downregulated DEGs are associated with transcription, biosynthesis, metabolism, photosynthesis, and cell wall organization.
- Upregulated DEGs are linked to DNA replication and phospholipid biosynthesis.
- 86.5% of 490 transcription factor DEGs were downregulated, including Malvaceae-specific MMLs.
- 15 out of 16 genes involved in cell wall organization are EXPA coding genes.
Conclusions:
- Lint fiber initiation is a complex process involving multiple transcription factors.
- These factors likely orchestrate cell wall reorganization and the cessation of cell division in differentiating fiber initials.
- The findings provide insights into the genetic control of cotton fiber development.
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