Cadmium Stress Disrupts Auxin Signaling and Growth in Ilex verticillata: Insights from Physiological and Transcriptomic Analyses

Summary

This experimental study elucidates the molecular mechanisms of cadmium stress tolerance in Ilex verticillata, a widely cultivated ornamental plant, by integrating physiological and transcriptomic analyses. Under soil cadmium stress (500 mmol/kg), the plant exhibited growth inhibition and oxidative stress, whilst transcriptomic profiling revealed significant enrichment of auxin signaling pathways and identified a regulatory module comprising six nucleus-localised IvIAA genes interacting with the IvMYB77 transcription factor. The findings suggest that auxin signaling represents a critical adaptive mechanism for heavy metal stress tolerance in ornamental horticulture, with potential implications for understanding cadmium phytotoxicity across plant species.

UK applicability

Whilst this research focuses on cadmium pollution in Chinese agricultural soils, the molecular insights into auxin-mediated heavy metal stress responses may have broad relevance for UK horticulture where ornamental plant production is prevalent. However, direct application would require validation under UK soil and climatic conditions, and cadmium contamination patterns differ between regions.

Key measures

stem growth inhibition; photosynthetic capacity; malondialdehyde, H₂O₂, and ·O₂⁻ levels; antioxidant enzyme activities; differentially expressed genes (DEGs); auxin signaling pathway enrichment; IvIAA gene expression and interaction with IvMYB77 transcription factor

Outcomes reported

The study measured physiological responses (stem growth, photosynthetic capacity, oxidative stress markers) and transcriptomic changes in Ilex verticillata under cadmium stress, identifying 3750 differentially expressed genes and characterising auxin signaling pathway involvement in stress tolerance.

Topic tags