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<p>Hydrogen sulfide (H<sub>2</sub>S) is a gaseous signaling molecule widely present in biological systems, with protein persulfidation being a key mechanism for its signal transduction. H<sub>2</sub>S regulates essential aspects of plant biology, from growth to stress resilience, via complex interplay with various hormonal pathways; however, the molecular mechanisms of its interaction with gibberellin in plants remain largely uncharacterized. DELLA serve as central inhibitory factors in GA signal transduction and are critical nodes within the crosstalk among various plant hormones and growth regulators. In the present research, we assessed the effect of sodium hydrosulfide (NaHS), a H<sub>2</sub>S donor, on primary root length, antioxidant enzyme activities, <i>DELLA</i> gene expression profiles, and DELLA protein stability in a series of Arabidopsis lines when subjected to salinity. The results demonstrated that DELLA mediates the alleviating effect of H<sub>2</sub>S on salt stress and that five DELLA members may have redundant functions during this process. However, DELLA did not influence H<sub>2</sub>S’s the regulation of osmotic and antioxidant systems. The presence of H<sub>2</sub>S resulted in decreased expression of five <i>DELLA</i> genes and a concomitant increase in the degradation of RGA, a member of the DELLA family, potentially via persulfidation. This research offers insights into the crosstalk between H<sub>2</sub>S and GA and provides a theoretical basis for enhancing crop traits.</p>

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H2S Promotes Degradation of DELLA in Arabidopsis under Salt Stress

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Dongsheng Wang,
  • Yueyue Qiao,
  • Xiaoduo Zhang,
  • Zhenhua Wang,
  • Weizhong Liu

摘要

Hydrogen sulfide (H2S) is a gaseous signaling molecule widely present in biological systems, with protein persulfidation being a key mechanism for its signal transduction. H2S regulates essential aspects of plant biology, from growth to stress resilience, via complex interplay with various hormonal pathways; however, the molecular mechanisms of its interaction with gibberellin in plants remain largely uncharacterized. DELLA serve as central inhibitory factors in GA signal transduction and are critical nodes within the crosstalk among various plant hormones and growth regulators. In the present research, we assessed the effect of sodium hydrosulfide (NaHS), a H2S donor, on primary root length, antioxidant enzyme activities, DELLA gene expression profiles, and DELLA protein stability in a series of Arabidopsis lines when subjected to salinity. The results demonstrated that DELLA mediates the alleviating effect of H2S on salt stress and that five DELLA members may have redundant functions during this process. However, DELLA did not influence H2S’s the regulation of osmotic and antioxidant systems. The presence of H2S resulted in decreased expression of five DELLA genes and a concomitant increase in the degradation of RGA, a member of the DELLA family, potentially via persulfidation. This research offers insights into the crosstalk between H2S and GA and provides a theoretical basis for enhancing crop traits.