Comparative Multi-Omics Analysis Reveals Key Pathways in Chlorophyll Metabolism and Stress Adaptation in Poplar Under Dual Stress
2025
Linxuan Zhang | Yunxi Zhu | Jiri Stribny | Xinyu Pan | Chengming Tian | Roger Schneiter
Poplar anthracnose, caused by Colletotrichum gloeosporioides, significantly threatens global poplar cultivation, with rising temperatures further intensifying environmental stress on trees. As autotrophic organisms, plants rely on photosynthesis for growth and stress responses, making this process particularly vulnerable under combined stressors, such as heat and pathogen infection. This study investigates the dual-stress response mechanisms of the resistant poplar species Populus ×: canadensis through integrated transcriptomic and metabolomic analyses. Results show that C. gloeosporioides inoculation at ambient temperature conditions activates multiple defense-related pathways, including MAPK signaling and ferroptosis. High temperatures amplify these responses, leading to extensive alterations in gene expression, particularly in pathways related to the cell cycle, photosynthesis, and phytohormone signaling. The chlorophyll content, a key marker of photosynthetic efficiency, is significantly reduced under high temperatures, with dual stress causing the most pronounced declines in chlorophyll a and b and total chlorophyll levels. These findings provide valuable insights into the molecular mechanisms underlying poplar resilience to anthracnose and heat stress, offering a foundation for breeding climate-resilient and pathogen-resistant tree cultivars.
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