Stress accelerates aging! (In leaves)

When I’ve had a stressful week I feel like I’ve aged 10 years. Luckily I bounce back after a bit of rest. By contrast, a new paper by Swift et al. shows that, in plants at least, stress accelerates aging at the transcriptional level. First, they did single-cell transcriptional profiling of leaves of different ages from the same-aged plants over the course of several days to establish an age-based fingerprint. Younger leaves expressed genes associated with cell division and growth (e.g., cyclins and wall-loosening enzymes), whereas older leaves expressed genes associated with senescence, such as KMD1 (a repressor of cyclin signaling). Next, they repeated the experiment on drought-stressed plants from which water was withheld. Interestingly, drought-stress caused aging-associated genes to be expressed earlier, which led to the leaf sizes being smaller. The authors similarly looked at a dose-response to drought intensity using a gradient of hard agar, and identified several genes positively responsive to aging and drought intensity, as well as negatively associated with plant size.They also identified a ferric chelate reductase, FRO6, that is positively correlated with aging but negatively correlated with drought stress. When they expressed this gene from a drought-insensitive promoter, the higher expression levels during drought were correlated with increased leaf area in the drought-stressed plants. This intriguing observation could lead to strategies to maintain plant growth and potentially yield during periods of drought. (Summary by Mary Williams @PlantTeaching.bsky.social) Nature Plants 10.1038/s41477-026-02254-3