The upregulation of endonuclease activities and subsequent decreases in the nucleic acid content leaves petals are characteristics senescence that allow for nutrient remobilization from dying organs. We previously identified a 43-kDa activity (PhNUC1) was upregulated Petunia × hybrida during senescence. PhNUC1 has optimal at neutral pH, is enhanced by Co2+, degrades both DNA RNA. peptide sequen...