Cell AgingCyclin-Dependent Kinase Inhibitor p16Telomerebeta-GalactosidaseAging, PrematureCyclin-Dependent Kinase Inhibitor p21TelomeraseBiological ProcessesTumor Suppressor Protein p53AgingTelomere ShorteningCells, CulturedFibroblastsCell ProliferationDNA DamageOxidative StressRetinoblastoma ProteinReactive Oxygen SpeciesSignal TransductionApoptosisEndothelial CellsCell Line, TumorCell CycleTOR Serine-Threonine KinasesUp-RegulationRNA InterferenceRNA, Small InterferingDown-RegulationGene Expression RegulationPhenotypeCell DivisionStem CellsHistonesp38 Mitogen-Activated Protein KinasesPlant LeavesBlotting, WesternTime FactorsCell LineEndothelium, VascularCell Cycle ProteinsMice, Inbred C57BLReverse Transcriptase Polymerase Chain ReactionMice, KnockoutAtherosclerosisGene Expression Regulation, NeoplasticDNA-Binding ProteinsFlow CytometryCell DifferentiationBiological MarkersTransfectionDose-Response Relationship, DrugPhosphorylationEnzyme ActivationImmunohistochemistryRNA, MessengerChlorophyllGene Expression Regulation, PlantEthylenesTumor Suppressor Protein p14ARFLongevityCell Cycle CheckpointsCell Transformation, NeoplasticArabidopsisPlant Growth RegulatorsTumor Suppressor ProteinsSirtuin 1Plant ProteinsFlowersPlants, Genetically ModifiedArabidopsis ProteinsCytokininsPetuniaras ProteinsDiploidyNeoplasmsMutationTelomeric Repeat Binding Protein 2Nuclear ProteinsModels, BiologicalCyclopentanesHydrogen Peroxide