Transcriptome data reveal gene clusters and key genes in pepper response to heat shock

Area of Science:

• Plant Science
• Genomics
• Climate Change Biology

Background:

• Climate change and global warming present significant threats to plant development and crop yields.
• Understanding plant responses to heat stress is vital for agricultural sustainability.

Purpose of the Study:

• To investigate genome-wide gene expression patterns in pepper plants under heat stress.
• To identify key genes and transcription factors involved in heat stress response and tolerance.

Main Methods:

• Performed time-course transcriptome analysis on pepper leaves and roots under 40°C heat stress.
• Utilized K-means clustering for gene expression dynamics, Gene Ontology (GO) enrichment, and transcription factor (TF) identification.
• Analyzed differentially expressed genes (DEGs) and the expression of 25 heat shock factor genes (HSFs).

Main Results:

• Identified 29,249 genes with distinct expression patterns under heat stress, grouped into 12 clusters.
• Found more differentially expressed genes in roots than in leaves, with maximum changes at 24 hours.
• Identified five heat shock factor genes responding to heat stress and characterized their roles in heat-tolerant and susceptible pepper lines.

Conclusions:

• Heat stress significantly alters genome-wide gene expression in pepper plants, with notable differences between roots and leaves.
• Specific heat shock factor genes play critical roles in mediating heat tolerance in pepper.
• This research enhances understanding of pepper's molecular mechanisms for heat stress adaptation.