To the best of our knowledge, this report was the earliest to detect H 2S in plants and illustrated that the gas could be generated endogenously, possibly an informational signal. The leaves of corn ( Zea mays L.), cucumber ( Cucumis sativus L.), pumpkin ( Cucurbita pepo L.) and soybean ( Glycine max L.) were shown to emit H 2S at a rate of approximately 40 pmol/min using a sulfur-specific flame photometric detector ( Wilson et al., 1978). Following the long evolutionary process that has separated plants and animals from their last common ancestors, plants still appear to be able to synthesize and consume H 2S. The gas was first reported as being poisonous in 1713, after which time numerous studies described the toxicological properties of H 2S. Hydrogen sulfide has classically been considered a poisonous gas that is hazardous to life and the environment. BIOSYNTHESIS AND PHYSIOLOGICAL FUNCTIONS OF H 2S IN PLANTS We also highlight recent breakthroughs concerning the biosynthesis and action of H 2S, and the crosstalk between NO, hydrogen peroxide (H 2O 2) and H 2S. In this review, we summarize the current state of knowledge of H 2S functions in plants. Recent studies on NO and H 2S in plants are beginning to uncover likely roles for these molecules in regulating plant stress responses ( Gotor et al., 2013 Corpas et al., 2019 Li et al., 2019). The relationships and molecular mechanisms of the gasotransmitters NO and hydrogen sulfide (H 2S) in animals are relatively clear due to well-established experimental methods ( Altaany et al., 2013 Zhang et al., 2018). Lipid-soluble gaseous molecules tend to play similar roles in different biological systems. This attention to NO encouraged extensive research on the gaseous molecules. Moreover, the 1998 Nobel Prize in medicine was awarded to three scientists for their exemplary work uncovering the role of NO. In fact, the gas was ranked a star molecule in Science magazine in 1992 ( Burnett et al., 1992 Snyder, 1992). As a gasotransmitter, NO attracted the attention of numerous scientists and has been a topic of lively interest in various systems.
#HYDROGEN MOLECULE SERIES#
The past decades have witnessed the discovery of nitric oxide (NO) as a gaseous messenger molecule (or gasotransmitter) controlling a series of physiological responses in animals ( Lundberg et al., 2008).
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