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Sulfur dioxide(SO2)was recently found to play a physiological role in animal cells.Here we study the role of sulfur dioxide(SO2)in programmed cell death(PCD)of barley aleurone layers.SO2 donor(NaHSO3/Na2SO3,1∶3 M/M)effectively alleviated PCD in barley aleurone layers in a dose-dependent manner with the optimal concentration at 0.05 mM.