Salicylic Acid’s impact on Sedum alfredii growth and cadmium tolerance: Comparative physiological, transcriptomic, and metabolomic study
Phytoextraction Cadmium Salicylic acid Transcriptomics Metabolomics
With the acceleration of industrialization, Cd pollution has emerged as a major threat to soil ecosystem health
and food safety. Hyperaccumulating plants like Sedum alfredii Hance are considered to be used as part of an
effective strategy for the ecological remediation of Cd polluted soils. This study delved deeply into the physio-
logical, transcriptomic, and metabolomic responses of S. alfredii under cadmium (Cd) stress when treated with
exogenous salicylic acid (SA). We found that SA notably enhanced the growth of S. alfredii and thereby increased
absorption and accumulation of Cd, effectively alleviating the oxidative stress caused by Cd through upregulation
of the antioxidant system. Transcriptomic and metabolomic data further unveiled the influence of SA on
photosynthesis, antioxidant defensive mechanisms, and metal absorption enrichment pathways. Notably, the
interactions between SA and other plant hormones, especially IAA and JA, played a central role in these pro-
cesses. These findings offer us a comprehensive perspective on understanding how to enhance the growth and
heavy metal absorption capabilities of hyperaccumulator plants by regulating plant hormones, providing
invaluable strategies for future environmental remediation efforts.
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