Cotton STARD Gene Family: Characterization, Evolution, and Expression Profiles During Salt Stress

Area of Science:

• Genomics
• Plant Biology
• Molecular Genetics

Background:

• Cotton is vital economically but vulnerable to salt stress, impacting yield and quality.
• The STARD gene family's role in plant stress responses is an area of interest.
• Understanding salt tolerance mechanisms in cotton is crucial for agricultural sustainability.

Purpose of the Study:

• To conduct a comprehensive genome-wide analysis of the cotton STARD gene family.
• To investigate the evolutionary relationships and expansion mechanisms of STARD genes in cotton.
• To elucidate the role of STARD genes, particularly under salt stress conditions.

Main Methods:

• Genome-wide analysis across four cotton species.
• Phylogenetic, chromosomal mapping, and collinearity analyses for evolutionary insights.
• Examination of gene structure, conserved motifs, and promoter cis-elements.

Main Results:

• STARD genes are widely distributed in cotton genomes, with segmental duplication driving expansion.
• Most duplicated STARD gene pairs evolved under purifying selection.
• Eleven GhSTARD genes exhibited altered expression under salt stress, with GhSTARD45 showing significant changes in roots.

Conclusions:

• The cotton STARD gene family has distinct structural features and roles in growth and stress.
• GhSTARD45 is identified as a key player in root-based salt tolerance mechanisms.
• STARD genes hold potential for developing salt-tolerant cotton varieties.