Deciphering early responsive signature genes in rice blast disease: an integrated temporal transcriptomic study

Area of Science:

• Plant Pathology
• Genomics
• Molecular Biology

Background:

• Rice blast disease, caused by Magnaporthe oryzae, is a major threat to global food security.
• Understanding early pathogen stress responses in rice is crucial for developing resistant varieties.

Purpose of the Study:

• To identify and analyze differentially expressed genes (DEGs) in rice during early stages of Magnaporthe oryzae infection.
• To uncover key genes and pathways involved in rice's response to blast disease.

Main Methods:

• Integrated time-series microarray (GSE95394) and RNA-Seq (GSE131641) datasets.
• Analyzed 1580 overlapped DEGs, constructed a protein-protein interaction (PPI) network, and identified hub genes using MCODE and CytoHubba.
• Validated hub gene expression and analyzed co-expression patterns and Gene Ontology enrichment.

Main Results:

• Identified eight hub genes (RPL8 upregulated; RPL27, OsPRPL3, RPL21, RPL9, RPS5, OsRPS9, RPL17 downregulated) crucial for pathogenesis.
• RPL8 showed distinct co-expression, while RPL9 played a central role among interconnected downregulated ribosomal proteins.
• Hub genes were enriched in ribosome biogenesis and protein translation, aligning with suppressed ribosome activity during plant defense.

Conclusions:

• The study provides novel insights into rice-blast interactions by identifying key ribosomal protein genes.
• Targeting these identified ribosomal proteins offers potential for developing novel stress-resistant rice varieties.
• Integrated transcriptomic analysis enhances reliability and deepens understanding of rice blast disease mechanisms.