. 2022 Dec 1;23(23):15107. doi: 10.3390/ijms232315107

Table 2.

H₂S improves plant stress tolerance.

Plant Species	Stressors	H₂S Doses	Protective Effects	References
Arabidopsis thaliana	Oxidative	0.5 mmol L⁻¹ NaHS	Repressed glycolate oxidase activities	[152]
Arabidopsis thaliana	Osmotic	150 mmol L⁻¹ NaHS	Involved in osmotic stress-triggered stomatal closure	[168]
Safflower	Drought: 70 and 50% field capacity	0.5 and 1.0 mmol L⁻¹ NaHS	Increased the accumulation of secondary metabolites Strengthened the antioxidant capacity Regulated elemental uptake	[171]
Wheat (Triticum aestivum L.)	Drought: 30% field capacity	10 mg m⁻³ SO₂	Triggered proline accumulation Activated antioxidant enzymes Changed expression level of transcription factors Increased H₂S content	[172]
Cyclocarya paliurus	Salinity: 100 mmol L⁻¹ NaCl	0.5 mmol L⁻¹ NaHS	Maintained chlorophyll fluorescence Regulating nitric oxide level Improved antioxidant capacity	[194]
Wheat (Triticum aestivum L.)	Heat: 40 °C	200 µmol L⁻¹ NaHS	Reduced glucose sensitivity Increased the activities of SOD, catalase, and the AsA-GSH cycle	[211]
Pepper (Capsicum annuum L.)	Chilling: 10 °C/5 °C day/night	1 mmol L⁻¹ NaHS	Enhanced the antioxidant capacity Increased the enzyme transcription levels Reduced the contents of O₂^•−, H₂O₂, and MDA	[210]
Wheat (Triticum aestivum L.) Rice (Oryza sativa L. var.)	Metalloids: 20 μmol L⁻¹ Cr(VI)	15 μmol L⁻¹ NaHS	Maintained fruit firmness Delayed pectin degradation Downregulated the expression of polygalacturonase, pectate lyase, and expansin	[221]

SOD: Superoxide dismutase; AsA-GSH: ascorbate-glutathione cycle; MDA: malondialdehyde; O₂^•−: superoxide radical; H₂O₂: hydrogen peroxide.