Transcriptional activator that acts as positive regulator of leaf senescence. Activates NYC1, SGR1, SGR2 and PAO, which are genes involved in chlorophyll catabolic processes. Activates senescence-associated genes, such as RNS1, SAG12 and SAG13. Interacts with RCD1. The NAC domain includes a DNA binding domain and a dimerization domain. Plants overexpressing NAC046 exhibit early-senescence phenotype and reduced chlorophyll content. Plants silencing NAC046 exhibit delayed-senescence phenotype and increased chlorophyll content.