Identification and adaptive evolution analysis of glutaredoxin genes in Populus spp.

Area of Science:

• Plant genomics
• Molecular evolution
• Biochemistry

Background:

• Glutaredoxin (GRX) proteins are crucial for cellular redox homeostasis and regulating cellular processes.
• The specific role of GRX genes in Populus spp. differentiation and adaptation remains largely unexplored.

Purpose of the Study:

• To investigate the diversity, transcript profiling, and adaptive evolution of GRX genes across four sections of poplar.
• To correct GRX gene annotations and understand their evolutionary patterns in Populus.

Main Methods:

• Bioinformatic analysis of GRX genes in four poplar sections.
• Comparative genomics to identify gene duplication events and positive selection.
• Transcriptome profiling to analyze gene expression under stress conditions.

Main Results:

• Identified 219 GRX genes, with corrected annotations for 13 genes.
• Observed distinct GRX gene profiles in sect. Turanga (P. euphratica) compared to other sections, notably fewer duplication events.
• Detected 18 pairs of GRX genes under positive selection, suggesting rapid evolution.
• Found upregulation of PtrGRX34 and orthologs under stress treatments.

Conclusions:

• The GRX gene family has expanded during poplar differentiation, with evidence of rapid evolution potentially aiding adaptation to environmental changes.
• This research provides insights into the molecular mechanisms of Populus adaptation and the adaptive evolution of GRX genes.