The role of H2S and its derivatives in plant responses to low O2.

Hydrogen sulfide (H2S) is linked to improved plant survival under low O2 by refining protein activity through persulfidation, which modulates antioxidant defenses, mitochondrial function, and hormonal signaling.

• Why it matters: Flooding and climate change increase oxygen deficiency in plants, and the field needs a clearer mechanistic account of how H2S and related signaling coordinate redox state and survival during hypoxia.
• What they did: The work discusses how persulfidation connects H2S to nitric oxide (NO) and reactive oxygen species (ROS), acting synergistically or antagonistically to influence cell redox state and survival.
• The result: Integrating biochemical and molecular signaling insights, it underscores H2S as a conserved mediator of low O2 responses and suggests potential to enhance crop resilience to submergence and waterlogging.

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