The first evidence of cytokinin delaying leaf senescence dates back to the late 1950 s when Richmond and Lang [19] showed that exogenous application of cytokinin could delay leaf senescence. Subsequently, the molecular
The first evidence of cytokinindelaying leaf senescence dates back to the late 1950 s whenRichmond and Lang [19] showed that exogenous application ofcytokinin could delay leaf senescence. Subsequently, the molecular