Abstract
Hydrogen sulfide (H2S) has been known for centuries as a toxic gas for animals and human, especially at higher concentrations. Similar to nitric oxide (NO) it has been also demonstrated that lower amounts of H2S may have beneficial effects on plants exposed to several abiotic stress factors such as salinity, drought, heat, or heavy metal stress. In addition, both appear to have multiple physiological functions during plants’ life cycles, from seed germination through stomatal movements to senescence. Several studies have tried to assess the relationship between them but there are still many questions to be answered, such as the up- or downstream role in signaling pathways or crosstalk with other molecules (reactive oxygen species, polyamines, etc.). In this chapter we try to give an overview of the cooperation of these remarkably “popular” gasotransmitters in plants under abiotic or biotic stress.
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