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00925njm 22002777a 4500 dc Díaz Mendoza, María Mercedes author Blanca Velasco-Arroyo, Blanca author González-Melendi, Pablo author Martínez, Manuel author Díaz, Isabel author 2014 Senescence-associated proteolysis in plants is a crucial process to relocalize nutrients from leaves to growing or storage tissues. The massive net degradation of proteins involves broad metabolic networks, different subcellular compartments, and several types of proteases and regulators. C1A cysteine proteases, grouped as cathepsin L-, B-, H-, and F-like according to their gene structures and phylogenetic relationships, are the most abundant enzymes responsible for the proteolytic activity during leaf senescence. Besides, cystatins as specific modulators of C1A peptidase activities exert a complex regulatory role in this physiological process. This overview article covers the most recent information on C1A proteases in leaf senescence in different plant species. Particularly, it is focussed on barley, as the unique species where the whole gene family members of C1A cysteine proteases and cystatins have been analysed. Mercedes Díaz-Mendoza, Blanca Velasco-Arroyo, Pablo González-Melendi, Manuel Martínez, Isabel Díaz, C1A cysteine protease–cystatin interactions in leaf senescence, Journal of Experimental Botany, Volume 65, Issue 14, July 2014, Pages 3825–3833, https://doi.org/10.1093/jxb/eru043 0022-0957 10.1093/jxb/eru043 https://hdl.handle.net/20.500.14352/95900 1460-2431 https://doi.org/10.1093/jxb/eru043 C1A cysteine protease–cystatin interactions in leaf senescence