Fig. 2

Changes of intracellular H₂O₂ contents in different compartments have different impacts on onset and progression of monocarpic senescence compared to wildtype Arabidopsis plants Columbia-0 (Col-0). The expression of the H₂O₂ sensor HyPER under the control of the 35S-CaMV promoter leads to constant and high expression of the HyPER protein and thereby scavenges H₂O₂. By directing HyPER to specific compartments, the H₂O₂ levels were specifically reduced there. While cytoplasmic and peroxisomal HyPER protein expression caused a delay in the onset of monocarpic senescence, chloroplastic HyPER expression retarded the progression of senescence