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Cysteine is a crucial metabolite in the plant immune response against pathogen attack (Álvarez et al., 2012) and in the redox signaling of different stress processes (Gotor et al., 2010). Cys degradation generates hydrogen sulfide, a potent inhibitor of aerobic respiration, which can act as a substrate for ATP production and also has important physiological functions as a signaling molecule as to improve drought resistance and regulate flower senescence (Jin et al., 2011; Zhang et al., 2011). In mitochondria, hydrogen sulfide can react spontaneously with glutathione to produce S-sulfanylglutathione, which is then converted to sulfite by sulfur dioxygenase (Holdorf et al., 2012).
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