Transcriptome differences between two sister desert poplar species under salt stress.

Area of Science:

• Plant Biology
• Genomics
• Molecular Biology

Background:

• Populus euphratica and Populus pruinosa are desert-adapted sister species with differing water availability.
• Both species inhabit arid environments with high temperatures and varying soil salinity.
• Hypothesis: Divergent regulatory and metabolic pathways evolved in response to distinct salt habitats and stresses.

Purpose of the Study:

• To compare transcriptomes of P. euphratica and P. pruinosa under salt stress.
• To identify differentially expressed genes (DEGs) and alternative splicing (AS) events.
• To elucidate species-specific and common genetic adaptations to salinity.

Main Methods:

• Transcriptome analysis of callus samples from both species under salt stress and control conditions.
• Identification and analysis of differentially expressed genes (DEGs).
• Detection and analysis of alternative splicing (AS) events.

Main Results:

• 36,144 transcripts identified; 1430 DEGs found in response to salt stress.
• Significant differences in Gene Ontology (GO) enrichment between species for both DEGs and AS events.
• Genes related to hormone biosynthesis, transporters, and transcription factors showed distinct responses.

Conclusions:

• Identified salt-responsive genes and proposed candidates for salinity adaptation in both poplar species.
• P. euphratica and P. pruinosa have evolved different genetic pathways for adapting to distinct desert salt habitats.
• Common DEGs under salt stress are valuable targets for improving crop salinity tolerance via transgenic approaches.