Sex-Specific Response to Stress in Populus

Area of Science:

• Plant Science
• Genetics
• Ecology

Background:

• The genus *Populus* (poplar and aspen) is a vital model organism for tree genetic research.
• Dioecious *Populus* species exhibit distinct male and female traits, which are subjects of intensive study.
• Understanding sex-specific differences is critical for both fundamental and applied research in *Populus*.

Purpose of the Study:

• To review and synthesize existing knowledge on sex-specific differences in *Populus* under various stress conditions.
• To analyze these differences across morphological, physiological, proteomic, and gene expression levels.
• To identify factors contributing to discrepancies in reported findings.

Main Methods:

• Literature review focusing on studies comparing male and female *Populus* responses to stress.
• Analysis of data across multiple stress types including drought, salinity, heavy metals, and nutrient deficiency.
• Examination of studies reporting on morphological, physiological, proteome, and gene expression variations.

Main Results:

• In most reviewed studies, male *Populus* exhibited superior adaptation to stress conditions compared to females.
• Males generally showed less damage, improved growth, higher photosynthetic capacity, and greater antioxidant activity.
• Recent studies reported no significant non-reproductive trait differences between sexes, suggesting variability in findings.

Conclusions:

• Male *Populus* often display enhanced stress tolerance, but results are not universally consistent.
• Discrepancies in findings may stem from variations in experimental design, species, genotypes, stress types, and sample sizes.
• Further research with standardized methodologies is needed to fully elucidate sex-specific stress responses in *Populus*.