Transcriptome Differences in Response Mechanisms to Low-Nitrogen Stress in Two Wheat Varieties

Area of Science:

• Plant Biology
• Genetics
• Agricultural Science

Background:

• Nitrogen is essential for wheat development.
• Understanding nitrogen use efficiency is critical for crop improvement.

Purpose of the Study:

• To investigate the molecular mechanisms underlying differential low-nitrogen tolerance in wheat varieties XM26 and LM23.
• To identify key genes and pathways involved in nitrogen stress response.

Main Methods:

• Chlorate sensitivity experiments to assess stress tolerance.
• Transcriptome analysis (RNA-Seq) to identify differentially expressed genes (DEGs).
• Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis.
• Quantitative real-time PCR (qRT-PCR) for gene expression validation.

Main Results:

• Significant differences in gene expression were observed between XM26 and LM23 under low-nitrogen conditions.
• XM26 exhibited enrichment in calcium-mediated plant-pathogen interaction, MAPK signaling, and phosphatidylinositol signaling pathways.
• 156 transcription factors were identified with distinct expression patterns between the two varieties.

Conclusions:

• Calcium-related pathways and signaling cascades play differential roles in mediating low-nitrogen stress tolerance in wheat.
• Wheat variety XM26 demonstrates a distinct molecular response to low-nitrogen stress compared to LM23, potentially due to enhanced calcium signaling.