THE FLUX OF ATMOSPHERIC H2S TO SPINACH LEAVES CAN BE AFFECTED BY THE SUPPLY OF O-ACETYLSERINE

H2S can be actively taken up and metabolized by plant leaves and at high atmospheric concentrations, its flux to shoots was limited by the internal resistance of the leaves to H2S. Feeding of O-acetylserine, the substrate for O-acetylserine sulfurylase, to detached leaves resulted in a decreased internal resistance of the leaves, and hence an increased H2S flux to the leaves. This demonstrated that the flux of H2S to leaves is determined by its metabolism.