Abstract
Hydrogen sulfide (H2S) has emerged as a signaling molecule in plants in the late 2000s. Since then, a spectrum of evidence indicates H2S as a key player in plant tolerance to abiotic stresses. This chapter summarizes the production of H2S and its signaling pathways in plants. The main mechanisms of plant defense induced by H2S in response to several abiotic stresses such as high metal availability, high salinity, drought, and extreme temperatures are also highlighted. Finally, the current knowledge on the interplay among H2S, phytohormones, second messengers, and metabolites is also presented. Overall, H2S mitigates the oxidative stress and the damage to organic molecules to maintain seed germination and contribute to plant growth and survival during stressful conditions.
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