Comparative transcriptome analysis reveals the regulation network for fiber strength in cotton

Area of Science:

• Plant Biology
• Genetics
• Biotechnology

Background:

• Cotton fiber strength (FS) is a critical trait for textile quality.
• Secondary cell wall (SCW) thickness and microcrystalline cellulose (MCC) content are potential determinants of FS.

Purpose of the Study:

• To investigate the impact of SCW thickness and MCC on cotton FS.
• To identify the molecular regulatory network controlling FS through comparative transcriptome analysis.

Main Methods:

• Transmission electron microscopy (TEM) for SCW and MCC analysis.
• Comparative transcriptome analysis of cotton varieties with differing FS.
• Gene Ontology (GO) and KEGG enrichment analysis.

Main Results:

• Significant differences in SCW thickness were observed between high and low FS cotton varieties, while MCC content showed no significant difference.
• Genes upregulated during SCW thickening, such as UDPG, CESA2, and NAC83, were strongly correlated with higher FS.
• Enrichment analysis indicated that upregulated genes are involved in carbon metabolism and cell wall-related pathways.

Conclusions:

• Developed recombinant inbred lines with elite FS from crosses between high and low FS parent lines.
• Elucidated the gene expression network governing SCW thickness in mature cotton fibers.
• Provided significant insights into the relationship between SCW characteristics and cotton FS.