High-concentration peat drives divergent transcriptomic responses to enhance saline-alkaline tolerance and phytoremediation in two Suaeda species
Li Zhou, Zhaokui Du, Pengpeng Lv, Zitong Wang, Chaonan Cai, Junmin Li
TL;DR
Adding high concentrations of peat improves salt tolerance and soil remediation in two halophyte species through distinct genetic responses.
Contribution
Identifies optimal peat concentration and species-specific genetic mechanisms for saline-alkaline soil remediation.
Findings
High peat concentration (18 g/kg) enhances salt tolerance and biomass in Suaeda species.
S. glauca activates growth-related pathways, while S. salsa boosts stress-mitigating secondary metabolism.
Both species downregulate amino acid degradation genes to conserve nitrogen for osmoprotection.
Abstract
Soil salinization threatens global land use and food security, and halophytes combined with peat amendments are promising for saline-alkali soil remediation. Here, we integrated transcriptomic and physiological analyses to investigate the adaptive responses of Suaeda glauca and S. salsa grown in saline-alkaline soils amended with peat at 0, 6, or 18 g/kg. Our results showed that a high peat concentration (18 g/kg) significantly improved salt tolerance and biomass accumulation in both species through distinct species-specific strategies. S. glauca upregulated growth-related pathways (e.g., nitrogen metabolism, and tricarboxylic acid cycle) mediated by bHLH and bZIP transcription factors (TFs), whereas S. salsa activated stress-mitigating secondary metabolism (e.g., flavonoids, phenylpropanoids, anthocyanins) regulated by MYB and NAC TFs. A conserved response across both species was the…
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Taxonomy
TopicsPlant Stress Responses and Tolerance · Plant nutrient uptake and metabolism · Plant responses to water stress